"""
2026.1.4
2026.1.4
4.57.6
0.24.0
__UNSLOTH_VERSIONING__
"""

# Unsloth auto generated code
# Copyright 2023-present Daniel Han-Chen, Michael Han-Chen & the Unsloth team. All rights reserved.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

from torch import Tensor
import torch
import torch.nn as nn
from torch.nn import functional as F
from typing import Any, List, Optional, Tuple, Union, Dict, Set, Callable
from trl.trainer.kto_trainer import (Any, AutoModelForCausalLM, BaseImageProcessor, BaseTrainer, Callable, DPODataCollatorWithPadding, DataCollator, DataLoader, Dataset, EvalLoopOutput, F, FeatureExtractionMixin, KTOConfig, KTOTrainer, Literal, Optional, PartialState, Path, PeftModel, PreTrainedModel, PreTrainedTokenizerBase, ProcessorMixin, SequentialSampler, TrainerCallback, TrainingArguments, Union, _get_kl_dataset, _process_tokens, _tokenize, autocast, concatenate_datasets, contextmanager, create_reference_model, defaultdict, disable_dropout_in_model, has_length, inspect, is_comet_available, is_liger_kernel_available, is_peft_available, is_wandb_available, itemgetter, log_table_to_comet_experiment, logger, logging, maybe_apply_chat_template, maybe_extract_prompt, maybe_unpair_preference_dataset, nn, np, nullcontext, os, pad_to_length, pd, peft_module_casting_to_bf16, prepare_deepspeed, prepare_model_for_kbit_training, random, selective_log_softmax, textwrap, torch, tqdm, warnings, F, Optional, PeftModel, PreTrainedModel, is_peft_available, logger, os, torch)


import os
from typing import *
from dataclasses import dataclass, field
from packaging.version import Version
import torch
import numpy as np
from contextlib import nullcontext
from torch.nn import functional as F
import inspect
from transformers import DataCollatorForSeq2Seq, DataCollatorForLanguageModeling as TransformersDataCollatorForLanguageModeling
from transformers.training_args import ParallelMode

# Wrap trainer with padding to right and enable training mode
# Also patches W&B since multiple runs must use wandb.finish()
import functools
from types import MethodType
try:
    from unsloth_zoo.gradient_checkpointing import reset_unsloth_gradient_checkpointing_buffers
except:
    def reset_unsloth_gradient_checkpointing_buffers(): pass
def prepare_for_training_mode(f):
    @functools.wraps(f)
    def wrapper(self, *args, **kwargs):
        # Enable training mode
        _was_training = None
        # Get gradient checkpointing setting from training arguments
        use_gc = getattr(self.args, 'gradient_checkpointing', True)
        if hasattr(self, 'model') and hasattr(self.model, "training"):
            _was_training = self.model.training
        if hasattr(self, 'model') and hasattr(self.model, "for_training"):
            self.model.for_training(use_gradient_checkpointing=use_gc)
        output = f(self, *args, **kwargs)
        # Restore previous mode when possible
        if hasattr(self, 'model') and hasattr(self.model, "for_inference"):
            if _was_training is False:
                self.model.for_inference()
            elif _was_training is True and hasattr(self.model, "for_training"):
                self.model.for_training(use_gradient_checkpointing=use_gc)
        # Reset gradient checkpointing buffers to free memory while staying ready for next run
        try:
            reset_unsloth_gradient_checkpointing_buffers()
        except:
            pass
        # Patch W&B to enable logging on future runs, otherwise it'll overwrite the first run
        try:
            import wandb
            wandb.finish()
        except:
            pass
        return output
    return wrapper
pass

torch_compile_options = {
    "epilogue_fusion"   : True,
    "max_autotune"      : False,
    "shape_padding"     : True,
    "trace.enabled"     : False,
    "triton.cudagraphs" : False,
}

@torch.compile(dynamic = True, fullgraph = True, options = torch_compile_options,)
def chunked_hidden_states_selective_log_softmax(
    hidden_states: torch.Tensor,
    lm_head: torch.Tensor,
    index: torch.Tensor,
    chunks: int = 4,
    logit_scale_multiply: float = 0.0,
    logit_scale_divide: float = 0.0,
    logit_softcapping: float = 0.0,
    temperature: float = 1.0,
) -> torch.Tensor:
    # All Unsloth Zoo code licensed under AGPL3 
    flat_hidden_states = hidden_states.reshape(-1, hidden_states.shape[-1]) 
    flat_index = index.reshape(-1)                                    

    chunked_hidden_states = torch.chunk(flat_hidden_states, chunks=chunks, dim=0)
    chunked_index = torch.chunk(flat_index, chunks=chunks, dim=0)
    
    all_per_token_logps = []
    
    for chunk_hidden_states, chunk_index in zip(chunked_hidden_states, chunked_index):
        chunk_logits = chunk_hidden_states.to(lm_head.dtype) @ lm_head.t()

        if logit_scale_multiply != 0.0:
            chunk_logits = chunk_logits * logit_scale_multiply
        if logit_scale_divide != 0.0:
            chunk_logits = chunk_logits / logit_scale_divide
        if logit_softcapping != 0.0:
            chunk_logits = chunk_logits * torch.tanh(chunk_logits / logit_softcapping)

        chunk_logits = chunk_logits.to(torch.float32)

        if temperature != 1.0:
            chunk_logits = chunk_logits / temperature

        selected_logits = torch.gather(chunk_logits, dim=-1, index=chunk_index.unsqueeze(-1)).squeeze(-1)
        logsumexp_values = torch.logsumexp(chunk_logits, dim=-1)
        per_token_logps = selected_logits - logsumexp_values
        all_per_token_logps.append(per_token_logps)
    
    all_per_token_logps = torch.concat(all_per_token_logps)
    
    all_per_token_logps = all_per_token_logps.reshape((hidden_states.shape[0], hidden_states.shape[1]))
    return all_per_token_logps

@torch.compile(dynamic = True, fullgraph = True, options = torch_compile_options,)
def chunked_selective_log_softmax(logits, index):
    # Split into 4 chunks only
    chunked_logits = torch.chunk(logits.reshape(-1, logits.shape[-1]), chunks = 4, dim = 0)
    chunked_index  = torch.chunk(index.reshape(-1), chunks = 4, dim = 0)
    all_per_token_logps = []
    # Below loop does the same as selective_log_softmax(chunk_logits, chunk_index)
    for chunk_logits, chunk_index in zip(chunked_logits, chunked_index):
        chunk_logits = chunk_logits.to(torch.float32)
        selected_logits = torch.gather(chunk_logits, dim = -1, index = chunk_index.unsqueeze(-1)).squeeze(-1)
        logsumexp_values = torch.logsumexp(chunk_logits, dim = -1)
        per_token_logps = selected_logits - logsumexp_values
        all_per_token_logps.append(per_token_logps)
    pass
    all_per_token_logps = torch.concat(all_per_token_logps)
    all_per_token_logps = all_per_token_logps.reshape((logits.shape[0], logits.shape[1]))
    return all_per_token_logps

def calculate_pad_tokens_in_prompt(
    input_ids: torch.Tensor,
    logits_to_keep: int,
    pad_token_id: int
) -> torch.Tensor:
    """
    Given prompt tensor, it returns all the left padded tokens in that sequence. so [pad, pad, pad, cat] = 3 tokens
    """
    if logits_to_keep >= input_ids.shape[1]:
        raise ValueError("logits_to_keep must be smaller than the sequence length.")

    prompt_section = input_ids[:, :-logits_to_keep]

    padding_mask = (prompt_section == pad_token_id)

    pad_token_counts = padding_mask.sum(dim=1)

    return pad_token_counts

def create_completion_attention_mask(
    completion_input_ids: torch.Tensor,
    left_pad_tokens_per_prompt: torch.Tensor,
    max_left_pad: int,
    pad_token_id: int
) -> torch.Tensor:
    """
    Given that we have a sequence, [p,p,p,c,c,c,pad,pad,pad]

    Where p are extra prompt tokens we got from slicing the torch tensor, c is completion tokens
    and pad are pad tokens, this function would make a completion mask that would 0 out the pad
    and p tokens. so in this example [0,0,0,1,1,1,0,0,0]
    """
    batch_size, completion_len = completion_input_ids.shape
    device = completion_input_ids.device

    num_tokens_to_mask = max_left_pad - left_pad_tokens_per_prompt

    indices = torch.arange(completion_len, device=device).unsqueeze(0)
    shift_mask = indices >= num_tokens_to_mask.unsqueeze(1)

    non_padding_mask = (completion_input_ids != pad_token_id)

    final_mask = shift_mask & non_padding_mask

    return final_mask

def left_pack_padding(tensor: torch.Tensor, pad_id: int) -> torch.Tensor:
    """
    Moves all padding tokens in each sequence of a batch to the right.
    """
    mask = (tensor != pad_id)
    # Must do stable=True since binary mark is unordered
    sorted_indices = torch.argsort(mask, dim=1, descending=True, stable=True)
    packed_tensor = torch.gather(tensor, 1, sorted_indices)
    return packed_tensor

def align_logprobs_with_mask(
    logprob_tensor: torch.Tensor,
    attention_mask: torch.Tensor,
    pad_value: float = 0.0
) -> torch.Tensor:
    """
    Aligns a log probability tensor with a given attention mask.
    """

    device = logprob_tensor.device
    batch_size, logprob_seq_len = logprob_tensor.shape
    mask_seq_len = attention_mask.shape[1]

    padded_logprobs = torch.full(
        attention_mask.shape,
        fill_value=pad_value,
        dtype=logprob_tensor.dtype,
        device=device
    )

    left_pad_counts = torch.argmax(attention_mask, dim=1)

    cols = torch.arange(logprob_seq_len, device=device)
    dest_indices = left_pad_counts.unsqueeze(1) + cols

    # Create destination row indices
    # Shape: [batch_size, logprob_seq_len]
    row_indices = torch.arange(batch_size, device=device).unsqueeze(1).expand_as(dest_indices)

    # --- 4. Filter out-of-bounds indices and perform assignment ---
    # Create a mask to identify only the indices that are within the bounds
    # of the target tensor's sequence length.
    valid_mask = dest_indices < mask_seq_len

    # Use this mask to select only the valid row indices, column indices,
    # and the corresponding values from the logprob tensor.
    # This flattens the selected elements into 1D tensors.
    valid_rows = row_indices[valid_mask]
    valid_cols = dest_indices[valid_mask]
    valid_vals = logprob_tensor[valid_mask]

    # Place the valid values into their correct positions in the padded tensor
    # using a single, efficient advanced indexing operation.
    padded_logprobs[valid_rows, valid_cols] = valid_vals

    return padded_logprobs

def autotune_batch_and_chunks(
    total_input_rows, 
    seq_len, 
    hidden_size, 
    vocab_size, 
    dtype_bytes=16,
    multiplier=None
):
    if multiplier is None:
        final_m = max(4, seq_len // 4096)
    else:
        final_m = multiplier
    
    if torch.cuda.is_available():
        free_bytes, _ = torch.cuda.mem_get_info()
        limit_gb = (free_bytes / (1024**3))*.80

    bytes_to_gb = 1024**3

    b_vals = torch.arange(total_input_rows, 0, -1, device='cpu', dtype=torch.float32)

    hidden_gb = (b_vals * seq_len * hidden_size * dtype_bytes) / bytes_to_gb

    base_logits = ((b_vals/total_input_rows) * b_vals * seq_len * vocab_size * dtype_bytes) / bytes_to_gb
    logits_gb = base_logits / final_m

    total_mem_gb = hidden_gb + logits_gb
    
    valid_mask = total_mem_gb <= limit_gb
    valid_indices = torch.nonzero(valid_mask, as_tuple=False)

    if valid_indices.shape[0] == 0:
        #This means your GPU will OOM
        return 4, final_m

    best_idx = valid_indices[0].item()
    final_b = int(b_vals[best_idx].item())

    return final_b, final_m
@dataclass
class UnslothKTOConfig(KTOConfig):
    """
    
    Configuration class for the [`KTOTrainer`].

    This class includes only the parameters that are specific to KTO training. For a full list of training arguments,
    please refer to the [`~transformers.TrainingArguments`] documentation. Note that default values in this class may
    differ from those in [`~transformers.TrainingArguments`].

    Using [`~transformers.HfArgumentParser`] we can turn this class into
    [argparse](https://docs.python.org/3/library/argparse#module-argparse) arguments that can be specified on the
    command line.

    Parameters:
        max_length (`int` or `None`, *optional*, defaults to `1024`):
            Maximum length of the sequences (prompt + completion) in the batch. This argument is required if you want
            to use the default data collator.
        max_prompt_length (`int` or `None`, *optional*, defaults to `512`):
            Maximum length of the prompt. This argument is required if you want to use the default data collator.
        max_completion_length (`int`, *optional*):
            Maximum length of the completion. This argument is required if you want to use the default data collator
            and your model is an encoder-decoder.
        beta (`float`, *optional*, defaults to `0.1`):
            Parameter controlling the deviation from the reference model. Higher β means less deviation from the
            reference model.
        loss_type (`str`, *optional*, defaults to `"kto"`):
            Type of loss to use. Possible values are:

                - `"kto"`: KTO loss from the [KTO](https://huggingface.co/papers/2402.01306) paper.
                - `"apo_zero_unpaired"`: Unpaired variant of APO-zero loss from the
                  [APO](https://huggingface.co/papers/2408.06266) paper.

        desirable_weight (`float`, *optional*, defaults to `1.0`):
            Desirable losses are weighed by this factor to counter unequal number of desirable and undesirable paris.
        undesirable_weight (`float`, *optional*, defaults to `1.0`):
            Undesirable losses are weighed by this factor to counter unequal number of desirable and undesirable pairs.
        label_pad_token_id (`int`, *optional*, defaults to `-100`):
            Label pad token id. This argument is required if you want to use the default data collator.
        padding_value (`int`, *optional*):
            Padding value to use. If `None`, the padding value of the tokenizer is used.
        truncation_mode (`str`, *optional*, defaults to `"keep_end"`):
            Truncation mode to use when the prompt is too long. Possible values are `"keep_end"` or `"keep_start"`.
            This argument is required if you want to use the default data collator.
        generate_during_eval (`bool`, *optional*, defaults to `False`):
            If `True`, generates and logs completions from both the model and the reference model to W&B or Comet
            during evaluation.
        is_encoder_decoder (`bool`, *optional*):
            When using the `model_init` argument (callable) to instantiate the model instead of the `model` argument,
            you need to specify if the model returned by the callable is an encoder-decoder model.
        precompute_ref_log_probs (`bool`, *optional*, defaults to `False`):
            Whether to precompute reference model log probabilities for training and evaluation datasets. This is
            useful when training without the reference model to reduce the total GPU memory needed.
        model_init_kwargs (`dict[str, Any]`, *optional*):
            Keyword arguments to pass to `AutoModelForCausalLM.from_pretrained` when instantiating the model from a
            string.
        ref_model_init_kwargs (`dict[str, Any]`, *optional*):
            Keyword arguments to pass to `AutoModelForCausalLM.from_pretrained` when instantiating the reference model
            from a string.
        dataset_num_proc: (`int`, *optional*):
            Number of processes to use for processing the dataset.
        disable_dropout (`bool`, *optional*, defaults to `True`):
            Whether to disable dropout in the model and reference model.
        use_liger_loss (`bool`, *optional*, defaults to `False`):
            Whether to use Liger loss. It requires liger-kernel to be installed.
        base_model_attribute_name (`str`, *optional*, defaults to `"model"`):
            Name of the attribute in the model that contains the base model. This is used to get the base model from
            the model when the model does not have a `get_decoder` method in the case when `use_liger_loss` is `True`.
    
    """
    vllm_sampling_params: Optional[Any] = field(
        default = None,
        metadata = {'help': 'vLLM SamplingParams'},
    )
    unsloth_num_chunks : Optional[int] = field(
        default = -1,
        metadata = {'help': 'Chunk size to reduce memory usage. -1 is most efficient.'},
    )
    unsloth_logit_chunk_multiplier : Optional[int] = field(
            default = None,
            metadata = {'help': 'Multiplier for chunked logit computations.'},
        )
    unsloth_grpo_mini_batch : Optional[int] = field(
        default = None,
        metadata = {'help': 'Mini batch size for GRPO hidden state accumulation. Default is None unless user defines it.'},
    )
    max_seq_length : Optional[int] = field(
        default = None,
        metadata = {'help': 'Maximum sequence length to truncate to.'},
    )
    def __init__(
        self,
        output_dir = None,
        overwrite_output_dir = None,
        do_train = False,
        do_eval = False,
        do_predict = False,
        eval_strategy = 'no',
        prediction_loss_only = False,
        per_device_train_batch_size = 4,
        per_device_eval_batch_size = 4,
        per_gpu_train_batch_size = None,
        per_gpu_eval_batch_size = None,
        gradient_accumulation_steps = 2,
        eval_accumulation_steps = 2,
        eval_delay = 0,
        torch_empty_cache_steps = 250,
        learning_rate = 5e-05,
        weight_decay = 0.01,
        adam_beta1 = 0.9,
        adam_beta2 = 0.999,
        adam_epsilon = 1e-08,
        max_grad_norm = 1.0,
        num_train_epochs = 3.0,
        max_steps = -1,
        lr_scheduler_type = 'linear',
        lr_scheduler_kwargs = None,
        warmup_ratio = 0.1,
        warmup_steps = 0,
        log_level = 'passive',
        log_level_replica = 'warning',
        log_on_each_node = True,
        logging_dir = None,
        logging_strategy = 'steps',
        logging_first_step = False,
        logging_steps = 1,
        logging_nan_inf_filter = False,
        save_strategy = 'steps',
        save_steps = 500,
        save_total_limit = None,
        save_safetensors = True,
        save_on_each_node = False,
        save_only_model = False,
        restore_callback_states_from_checkpoint = False,
        no_cuda = False,
        use_cpu = False,
        use_mps_device = False,
        seed = 3407,
        data_seed = 3407,
        jit_mode_eval = False,
        bf16 = False,
        fp16 = False,
        fp16_opt_level = 'O1',
        half_precision_backend = 'auto',
        bf16_full_eval = False,
        fp16_full_eval = False,
        tf32 = None,
        local_rank = -1,
        ddp_backend = None,
        tpu_num_cores = None,
        tpu_metrics_debug = False,
        debug = '',
        dataloader_drop_last = False,
        eval_steps = None,
        dataloader_num_workers = 0,
        dataloader_prefetch_factor = None,
        past_index = -1,
        run_name = None,
        disable_tqdm = None,
        remove_unused_columns = True,
        label_names = None,
        load_best_model_at_end = False,
        metric_for_best_model = None,
        greater_is_better = None,
        ignore_data_skip = False,
        fsdp = None,
        fsdp_min_num_params = 0,
        fsdp_config = None,
        fsdp_transformer_layer_cls_to_wrap = None,
        accelerator_config = None,
        parallelism_config = None,
        deepspeed = None,
        label_smoothing_factor = 0.0,
        optim = 'adamw_8bit',
        optim_args = None,
        adafactor = False,
        group_by_length = False,
        length_column_name = 'length',
        report_to = 'none',
        project = 'huggingface',
        trackio_space_id = 'trackio',
        ddp_find_unused_parameters = None,
        ddp_bucket_cap_mb = None,
        ddp_broadcast_buffers = None,
        dataloader_pin_memory = True,
        dataloader_persistent_workers = False,
        skip_memory_metrics = True,
        use_legacy_prediction_loop = False,
        push_to_hub = False,
        resume_from_checkpoint = None,
        hub_model_id = None,
        hub_strategy = 'every_save',
        hub_token = None,
        hub_private_repo = None,
        hub_always_push = False,
        hub_revision = None,
        gradient_checkpointing = True,
        gradient_checkpointing_kwargs = None,
        include_inputs_for_metrics = False,
        eval_do_concat_batches = True,
        fp16_backend = 'auto',
        push_to_hub_model_id = None,
        push_to_hub_organization = None,
        push_to_hub_token = None,
        mp_parameters = '',
        auto_find_batch_size = False,
        full_determinism = False,
        torchdynamo = None,
        ray_scope = 'last',
        ddp_timeout = 1800,
        torch_compile = False,
        torch_compile_backend = None,
        torch_compile_mode = None,
        include_tokens_per_second = False,
        include_num_input_tokens_seen = False,
        neftune_noise_alpha = None,
        optim_target_modules = None,
        batch_eval_metrics = False,
        eval_on_start = False,
        use_liger_kernel = False,
        liger_kernel_config = None,
        eval_use_gather_object = False,
        average_tokens_across_devices = True,
        max_length = 1024,
        max_prompt_length = 512,
        max_completion_length = None,
        beta = 0.1,
        loss_type = 'kto',
        desirable_weight = 1.0,
        undesirable_weight = 1.0,
        label_pad_token_id = -100,
        padding_value = None,
        truncation_mode = 'keep_end',
        generate_during_eval = False,
        is_encoder_decoder = None,
        disable_dropout = True,
        precompute_ref_log_probs = False,
        model_init_kwargs = None,
        ref_model_init_kwargs = None,
        dataset_num_proc = None,
        use_liger_loss = False,
        base_model_attribute_name = 'model',
        vllm_sampling_params = None,
        unsloth_num_chunks = -1,
        unsloth_logit_chunk_multiplier = None, 
        unsloth_grpo_mini_batch = None, 
        max_seq_length = None,
        **kwargs,
    ):
        if learning_rate < 1e-7: print(f'Unsloth: Your learning rate of `{learning_rate}` is too small and less than 1e-7! Consider increasing it, otherwise gradient updates will be close to 0!')
        if learning_rate > 1: print(f'Unsloth: Your learning rate of `{learning_rate}` is way too larger > 1! Consider decreasing it to 1e-1, otherwise gradient updates will explode!')
        if output_dir is None and save_strategy == 'steps' and save_steps == 500:
            output_dir = 'unsloth_training_checkpoints'
            save_strategy = 'no'
        if dataset_num_proc is None:
            import psutil
            dataset_num_proc = min(max((psutil.cpu_count() or 1)+4, 2), 64)
            memory_gb_left = psutil.virtual_memory().available / (1024**3)
            if   memory_gb_left <=  4: dataset_num_proc = 1 # Too risky, so set to 1
            elif memory_gb_left <=  6: dataset_num_proc = min(2, dataset_num_proc)
            elif memory_gb_left <= 10: dataset_num_proc = min(4, dataset_num_proc)
            elif memory_gb_left <= 14: dataset_num_proc = min(6, dataset_num_proc)
        
        super().__init__(
            output_dir = output_dir,
            overwrite_output_dir = overwrite_output_dir,
            do_train = do_train,
            do_eval = do_eval,
            do_predict = do_predict,
            eval_strategy = eval_strategy,
            prediction_loss_only = prediction_loss_only,
            per_device_train_batch_size = per_device_train_batch_size,
            per_device_eval_batch_size = per_device_eval_batch_size,
            per_gpu_train_batch_size = per_gpu_train_batch_size,
            per_gpu_eval_batch_size = per_gpu_eval_batch_size,
            gradient_accumulation_steps = gradient_accumulation_steps,
            eval_accumulation_steps = eval_accumulation_steps,
            eval_delay = eval_delay,
            torch_empty_cache_steps = torch_empty_cache_steps,
            learning_rate = learning_rate,
            weight_decay = weight_decay,
            adam_beta1 = adam_beta1,
            adam_beta2 = adam_beta2,
            adam_epsilon = adam_epsilon,
            max_grad_norm = max_grad_norm,
            num_train_epochs = num_train_epochs,
            max_steps = max_steps,
            lr_scheduler_type = lr_scheduler_type,
            lr_scheduler_kwargs = lr_scheduler_kwargs,
            warmup_ratio = warmup_ratio,
            warmup_steps = warmup_steps,
            log_level = log_level,
            log_level_replica = log_level_replica,
            log_on_each_node = log_on_each_node,
            logging_dir = logging_dir,
            logging_strategy = logging_strategy,
            logging_first_step = logging_first_step,
            logging_steps = logging_steps,
            logging_nan_inf_filter = logging_nan_inf_filter,
            save_strategy = save_strategy,
            save_steps = save_steps,
            save_total_limit = save_total_limit,
            save_safetensors = save_safetensors,
            save_on_each_node = save_on_each_node,
            save_only_model = save_only_model,
            restore_callback_states_from_checkpoint = restore_callback_states_from_checkpoint,
            no_cuda = no_cuda,
            use_cpu = use_cpu,
            use_mps_device = use_mps_device,
            seed = seed,
            data_seed = data_seed,
            jit_mode_eval = jit_mode_eval,
            bf16 = bf16,
            fp16 = fp16,
            fp16_opt_level = fp16_opt_level,
            half_precision_backend = half_precision_backend,
            bf16_full_eval = bf16_full_eval,
            fp16_full_eval = fp16_full_eval,
            tf32 = tf32,
            local_rank = local_rank,
            ddp_backend = ddp_backend,
            tpu_num_cores = tpu_num_cores,
            tpu_metrics_debug = tpu_metrics_debug,
            debug = debug,
            dataloader_drop_last = dataloader_drop_last,
            eval_steps = eval_steps,
            dataloader_num_workers = dataloader_num_workers,
            dataloader_prefetch_factor = dataloader_prefetch_factor,
            past_index = past_index,
            run_name = run_name,
            disable_tqdm = disable_tqdm,
            remove_unused_columns = remove_unused_columns,
            label_names = label_names,
            load_best_model_at_end = load_best_model_at_end,
            metric_for_best_model = metric_for_best_model,
            greater_is_better = greater_is_better,
            ignore_data_skip = ignore_data_skip,
            fsdp = fsdp,
            fsdp_min_num_params = fsdp_min_num_params,
            fsdp_config = fsdp_config,
            fsdp_transformer_layer_cls_to_wrap = fsdp_transformer_layer_cls_to_wrap,
            accelerator_config = accelerator_config,
            parallelism_config = parallelism_config,
            deepspeed = deepspeed,
            label_smoothing_factor = label_smoothing_factor,
            optim = optim,
            optim_args = optim_args,
            adafactor = adafactor,
            group_by_length = group_by_length,
            length_column_name = length_column_name,
            report_to = report_to,
            project = project,
            trackio_space_id = trackio_space_id,
            ddp_find_unused_parameters = ddp_find_unused_parameters,
            ddp_bucket_cap_mb = ddp_bucket_cap_mb,
            ddp_broadcast_buffers = ddp_broadcast_buffers,
            dataloader_pin_memory = dataloader_pin_memory,
            dataloader_persistent_workers = dataloader_persistent_workers,
            skip_memory_metrics = skip_memory_metrics,
            use_legacy_prediction_loop = use_legacy_prediction_loop,
            push_to_hub = push_to_hub,
            resume_from_checkpoint = resume_from_checkpoint,
            hub_model_id = hub_model_id,
            hub_strategy = hub_strategy,
            hub_token = hub_token,
            hub_private_repo = hub_private_repo,
            hub_always_push = hub_always_push,
            hub_revision = hub_revision,
            gradient_checkpointing = gradient_checkpointing,
            gradient_checkpointing_kwargs = gradient_checkpointing_kwargs,
            include_inputs_for_metrics = include_inputs_for_metrics,
            eval_do_concat_batches = eval_do_concat_batches,
            fp16_backend = fp16_backend,
            push_to_hub_model_id = push_to_hub_model_id,
            push_to_hub_organization = push_to_hub_organization,
            push_to_hub_token = push_to_hub_token,
            mp_parameters = mp_parameters,
            auto_find_batch_size = auto_find_batch_size,
            full_determinism = full_determinism,
            torchdynamo = torchdynamo,
            ray_scope = ray_scope,
            ddp_timeout = ddp_timeout,
            torch_compile = torch_compile,
            torch_compile_backend = torch_compile_backend,
            torch_compile_mode = torch_compile_mode,
            include_tokens_per_second = include_tokens_per_second,
            include_num_input_tokens_seen = include_num_input_tokens_seen,
            neftune_noise_alpha = neftune_noise_alpha,
            optim_target_modules = optim_target_modules,
            batch_eval_metrics = batch_eval_metrics,
            eval_on_start = eval_on_start,
            use_liger_kernel = use_liger_kernel,
            liger_kernel_config = liger_kernel_config,
            eval_use_gather_object = eval_use_gather_object,
            average_tokens_across_devices = average_tokens_across_devices,
            max_length = max_length,
            max_prompt_length = max_prompt_length,
            max_completion_length = max_completion_length,
            beta = beta,
            loss_type = loss_type,
            desirable_weight = desirable_weight,
            undesirable_weight = undesirable_weight,
            label_pad_token_id = label_pad_token_id,
            padding_value = padding_value,
            truncation_mode = truncation_mode,
            generate_during_eval = generate_during_eval,
            is_encoder_decoder = is_encoder_decoder,
            disable_dropout = disable_dropout,
            precompute_ref_log_probs = precompute_ref_log_probs,
            model_init_kwargs = model_init_kwargs,
            ref_model_init_kwargs = ref_model_init_kwargs,
            dataset_num_proc = dataset_num_proc,
            use_liger_loss = use_liger_loss,
            base_model_attribute_name = base_model_attribute_name,**kwargs)
        self.vllm_sampling_params = vllm_sampling_params
        self.unsloth_num_chunks = unsloth_num_chunks
        if unsloth_grpo_mini_batch is not None:
            if self.generation_batch_size >= unsloth_grpo_mini_batch:
                self.unsloth_grpo_mini_batch = unsloth_grpo_mini_batch
            else:
                raise ValueError(
                    f"Unsloth GRPO mini batch size needs to be less than or equal to the effective generation batch size, "
                    f"which is self.per_device_train_batch_size * gradient_accumulation_steps."
                )
        self.unsloth_logit_chunk_multiplier = unsloth_logit_chunk_multiplier
        self.max_seq_length = max_seq_length
pass

class _UnslothKTOTrainer(BaseTrainer):
    r""""""

    _tag_names = ["trl", "kto"]
    _name = "KTO"
    _paper = {
        "title": "KTO: Model Alignment as Prospect Theoretic Optimization",
        "id": "2402.01306",
        # docstyle-ignore
        "citation": textwrap.dedent("""\
            @article{ethayarajh2024kto,
                title        = {{KTO: Model Alignment as Prospect Theoretic Optimization}},
                author       = {Kawin Ethayarajh and Winnie Xu and Niklas Muennighoff and Dan Jurafsky and Douwe Kiela},
                year         = 2024,
                eprint       = {arXiv:2402.01306},
            }"""),
    }

    def __init__(
        self,
        model: Union[PreTrainedModel, nn.Module, str] = None,
        ref_model: Optional[Union[PreTrainedModel, nn.Module, str]] = None,
        args: KTOConfig = None,
        train_dataset: Optional[Dataset] = None,
        eval_dataset: Optional[Union[Dataset, dict[str, Dataset]]] = None,
        processing_class: Optional[
            Union[PreTrainedTokenizerBase, BaseImageProcessor, FeatureExtractionMixin, ProcessorMixin]
        ] = None,
        data_collator: Optional[DataCollator] = None,
        model_init: Optional[Callable[[], PreTrainedModel]] = None,
        callbacks: Optional[list[TrainerCallback]] = None,
        optimizers: tuple[torch.optim.Optimizer, torch.optim.lr_scheduler.LambdaLR] = (None, None),
        preprocess_logits_for_metrics: Optional[Callable[[torch.Tensor, torch.Tensor], torch.Tensor]] = None,
        peft_config: Optional[dict] = None,
        compute_metrics: Optional[Callable[[EvalLoopOutput], dict]] = None,
        model_adapter_name: Optional[str] = None,
        ref_adapter_name: Optional[str] = None,
    ):
        if not os.environ.get("TRL_EXPERIMENTAL_SILENCE"):
            warnings.warn(
                "This trainer will soon be moved to trl.experimental and is a candidate for removal. If you rely on "
                "it and want it to remain, please share your comments here: "
                "https://github.com/huggingface/trl/issues/4223. Silence this warning by setting environment variable "
                "TRL_EXPERIMENTAL_SILENCE=1."
            )
        if type(args) is TrainingArguments:
            raise ValueError("Please use `KTOConfig` instead TrainingArguments.")

        if not isinstance(model, str) and ref_model is model:
            raise ValueError(
                "`model` and `ref_model` cannot be the same object. If you want `ref_model` to be the "
                "same as `model`, you must mass a copy of it, or `None` if you use peft."
            )

        if args.model_init_kwargs is None:
            model_init_kwargs = {}
        elif not isinstance(model, str):
            raise ValueError("You passed model_kwargs to the KTOTrainer. But your model is already instantiated.")
        else:
            model_init_kwargs = args.model_init_kwargs
            dtype = model_init_kwargs.get("dtype")
            if dtype is not None:
                # Convert to `torch.dtype` if an str is passed
                if isinstance(dtype, str) and dtype != "auto":
                    dtype = getattr(torch, dtype)
                if dtype != "auto" and not isinstance(dtype, torch.dtype):
                    raise ValueError(
                        f"Invalid `dtype` passed to the KTOConfig. Expected a string with either `torch.dtype` or 'auto', but got {dtype}."
                    )
                model_init_kwargs["dtype"] = dtype

        if args.ref_model_init_kwargs is None:
            ref_model_init_kwargs = {}
        elif not isinstance(ref_model, str):
            raise ValueError(
                "You passed ref_model_kwargs to the KTOTrainer. But your ref_model is already instantiated."
            )
        else:
            ref_model_init_kwargs = args.ref_model_init_kwargs
            dtype = ref_model_init_kwargs.get("dtype")
            if dtype is not None:
                # Convert to `torch.dtype` if an str is passed
                if isinstance(dtype, str) and dtype != "auto":
                    dtype = getattr(torch, dtype)
                if dtype != "auto" and not isinstance(dtype, torch.dtype):
                    raise ValueError(
                        f"Invalid `dtype` passed to the KTOConfig. Expected a string with either `torch.dtype` or 'auto', but got {dtype}."
                    )
                ref_model_init_kwargs["dtype"] = dtype

        if isinstance(model, str):
            model = AutoModelForCausalLM.from_pretrained(model, **model_init_kwargs)

        if isinstance(ref_model, str):
            ref_model = AutoModelForCausalLM.from_pretrained(ref_model, **ref_model_init_kwargs)

        # Initialize this variable to False. This helps tracking the case when `peft_module_casting_to_bf16`
        # has been called in order to properly call autocast if needed.
        self._peft_has_been_casted_to_bf16 = False

        if not is_peft_available() and peft_config is not None:
            raise ValueError(
                "PEFT is not installed and you passed a `peft_config` in the trainer's kwargs, please install it with `pip install peft` to use the PEFT models"
            )
        elif is_peft_available() and peft_config is not None:
            # if model is a peft model and we have a peft_config, we merge and unload it first
            if isinstance(model, PeftModel):
                model = model.merge_and_unload()

            if getattr(model, "is_loaded_in_8bit", False) or getattr(model, "is_loaded_in_4bit", False):
                _support_gc_kwargs = hasattr(
                    args, "gradient_checkpointing_kwargs"
                ) and "gradient_checkpointing_kwargs" in list(
                    inspect.signature(prepare_model_for_kbit_training).parameters
                )

                prepare_model_kwargs = {"use_gradient_checkpointing": args.gradient_checkpointing}

                if _support_gc_kwargs:
                    prepare_model_kwargs["gradient_checkpointing_kwargs"] = args.gradient_checkpointing_kwargs

                model = prepare_model_for_kbit_training(model, **prepare_model_kwargs)
            elif args.gradient_checkpointing:
                # For backward compatibility with older versions of transformers
                if hasattr(model, "enable_input_require_grads"):
                    model.enable_input_require_grads()
                else:

                    def make_inputs_require_grad(module, input, output):
                        output.requires_grad_(True)

                    model.get_input_embeddings().register_forward_hook(make_inputs_require_grad)

            # get peft model with the given config
            model = model
            if args.bf16 and getattr(model, "is_loaded_in_4bit", False):
                peft_module_casting_to_bf16(model)
                # If args.bf16 we need to explicitly call `generate` with torch amp autocast context manager
                self._peft_has_been_casted_to_bf16 = True

        # For models that use gradient_checkpointing, we need to attach a hook that enables input
        # to explicitly have `requires_grad=True`, otherwise training will either silently
        # fail or completely fail.
        elif args.gradient_checkpointing:
            # For backward compatibility with older versions of transformers
            if hasattr(model, "enable_input_require_grads"):
                model.enable_input_require_grads()
            else:

                def make_inputs_require_grad(module, input, output):
                    output.requires_grad_(True)

                model.get_input_embeddings().register_forward_hook(make_inputs_require_grad)

        if args.generate_during_eval and not (is_wandb_available() or is_comet_available()):
            raise ValueError(
                "`generate_during_eval=True` requires Weights and Biases or Comet to be installed."
                " Please install `wandb` or `comet-ml` to resolve."
            )

        if model is not None:
            self.is_encoder_decoder = model.config.is_encoder_decoder
        elif args.is_encoder_decoder is None:
            raise ValueError("When no model is provided, you need to pass the parameter is_encoder_decoder.")
        else:
            self.is_encoder_decoder = args.is_encoder_decoder

        self.is_peft_model = is_peft_available() and isinstance(model, PeftModel)
        self.model_adapter_name = model_adapter_name
        self.ref_adapter_name = ref_adapter_name

        if ref_model:
            self.ref_model = ref_model
        elif self.is_peft_model or args.precompute_ref_log_probs:
            # The `model` with adapters turned off will be used as the reference model
            self.ref_model = None
        else:
            self.ref_model = create_reference_model(model)

        if processing_class is None:
            raise ValueError(
                "max_length or a processing_class must be specified when using the default DPODataCollatorWithPadding"
            )
        if args.max_length is None:
            logger.warning(
                "When using DPODataCollatorWithPadding, you should set `max_length` in the KTOTrainer's init"
                " it will be set to `512` by default, but you should do it yourself in the future.",
            )
            max_length = 512
        if args.max_length is not None:
            max_length = args.max_length

        if args.max_prompt_length is None:
            logger.warning(
                "When using DPODataCollatorWithPadding, you should set `max_prompt_length` in the KTOTrainer's init"
                " it will be set to `128` by default, but you should do it yourself in the future.",
            )
            max_prompt_length = 128
        if args.max_prompt_length is not None:
            max_prompt_length = args.max_prompt_length

        max_completion_length = None
        if args.max_completion_length is None and self.is_encoder_decoder:
            logger.warning(
                "When using DPODataCollatorWithPadding with an encoder decoder architecture, you should set `max_completion_length` in the KTOTrainer's init"
                " it will be set to `128` by default, but you should do it yourself in the future.",
            )
            max_completion_length = 128
        if args.max_completion_length is not None and self.is_encoder_decoder:
            max_completion_length = args.max_completion_length

        if data_collator is None:
            data_collator = DPODataCollatorWithPadding(
                pad_token_id=processing_class.pad_token_id,
                label_pad_token_id=args.label_pad_token_id,
                is_encoder_decoder=self.is_encoder_decoder,
            )

            if args.remove_unused_columns:
                args.remove_unused_columns = False
                # warn users
                logger.warning(
                    "When using DPODataCollatorWithPadding, you should set `remove_unused_columns=False` in your KTOConfig"
                    " we have set it for you, but you should do it yourself in the future.",
                )

            self.use_dpo_data_collator = True
        else:
            self.use_dpo_data_collator = False

        # Disable dropout in the model and reference model
        if args.disable_dropout:
            disable_dropout_in_model(model)
            if self.ref_model is not None:
                disable_dropout_in_model(self.ref_model)

        self.loss_type = args.loss_type
        self.max_length = max_length
        self.generate_during_eval = args.generate_during_eval
        self.label_pad_token_id = args.label_pad_token_id
        self.padding_value = args.padding_value if args.padding_value is not None else processing_class.pad_token_id
        self.max_prompt_length = max_prompt_length
        self.truncation_mode = args.truncation_mode
        self.max_completion_length = max_completion_length
        self.processing_class = processing_class
        self.precompute_ref_log_probs = args.precompute_ref_log_probs

        # Not all losses require a KL calculation
        self.calculate_KL = True
        if self.loss_type in ["apo_zero_unpaired"]:
            self.calculate_KL = False

        # Since ref_logs are precomputed on the first call to get_train/eval_dataloader
        # keep track of first called to avoid computation of future calls
        self._precomputed_train_ref_log_probs = False
        self._precomputed_eval_ref_log_probs = False

        # metric
        self._stored_metrics = defaultdict(lambda: defaultdict(list))

        # KTO parameter
        self.beta = args.beta
        self.desirable_weight = args.desirable_weight
        self.undesirable_weight = args.undesirable_weight
        self.aux_loss_enabled = getattr(model.config, "output_router_logits", False)
        self.aux_loss_coef = getattr(model.config, "router_aux_loss_coef", 0.0)
        if self.aux_loss_enabled and self.aux_loss_coef == 0.0:
            logger.warning(
                "You set `output_router_logits` to `True` in the model config, but `router_aux_loss_coef` is set to "
                "`0.0`, meaning the auxiliary loss will not be used. Either set `router_aux_loss_coef` to a value "
                "greater than `0.0`, or set `output_router_logits` to `False` if you don't want to use the auxiliary "
                "loss.",
            )

        # The trainer estimates the number of FLOPs [floating-point operations] using the number of elements in the
        # input tensor associated with the key "input_ids". However, in KTO, the sampled data does not include the
        # "input_ids" key. Instead, the available keys are "prompt_input_ids" and "completion_input_ids". As a result,
        # the trainer issues the warning: "Could not estimate the number of tokens of the input, floating-point
        # operations will not be computed." To suppress this warning, we set the "estimate_tokens" key in the model's
        # "warnings_issued" dictionary to True. This acts as a flag to indicate that the warning has already been
        # issued.
        model.warnings_issued["estimate_tokens"] = True

        # Compute that only on the main process for faster data processing.
        # see: https://github.com/huggingface/trl/pull/1255
        with PartialState().main_process_first():
            # Extract the prompt if needed
            train_dataset = train_dataset.map(
                maybe_extract_prompt, num_proc=args.dataset_num_proc, desc="Extracting prompt from train dataset"
            )
            # Unpair the dataset if needed
            train_dataset = maybe_unpair_preference_dataset(
                train_dataset, args.dataset_num_proc, desc="Unpairing train dataset"
            )
            # Apply the chat template if needed
            train_dataset = train_dataset.map(
                maybe_apply_chat_template,
                fn_kwargs={"tokenizer": processing_class},
                num_proc=args.dataset_num_proc,
                desc="Applying chat template to train dataset",
            )
            if eval_dataset is not None:
                eval_dataset = eval_dataset.map(
                    maybe_extract_prompt, num_proc=args.dataset_num_proc, desc="Extracting prompt from eval dataset"
                )
                eval_dataset = maybe_unpair_preference_dataset(
                    eval_dataset, args.dataset_num_proc, desc="Unpairing eval dataset"
                )
                eval_dataset = eval_dataset.map(
                    maybe_apply_chat_template,
                    fn_kwargs={"tokenizer": processing_class},
                    num_proc=args.dataset_num_proc,
                    desc="Applying chat template to eval dataset",
                )

            # Tokenize and prepare the training datasets
            train_dataset = train_dataset.map(
                _tokenize,
                batched=True,
                fn_kwargs={"tokenizer": self.processing_class},
                num_proc=args.dataset_num_proc,
                desc="Tokenizing train dataset",
            )

            fn_kwargs = {
                "prefix": "",
                "is_encoder_decoder": self.is_encoder_decoder,
                "tokenizer": self.processing_class,
                "max_length": self.max_length,
                "truncation_mode": self.truncation_mode,
                "label_pad_token_id": self.label_pad_token_id,
                "max_prompt_length": self.max_prompt_length,
                "max_completion_length": self.max_completion_length,
            }

            train_dataset = train_dataset.map(
                _process_tokens,
                fn_kwargs=fn_kwargs,
                num_proc=args.dataset_num_proc,
                desc="Processing tokenized train dataset",
            )

            # Tokenize and prepare the eval datasets
            if eval_dataset is not None:
                eval_dataset = eval_dataset.map(
                    _tokenize,
                    fn_kwargs={"tokenizer": self.processing_class},
                    batched=True,
                    num_proc=args.dataset_num_proc,
                    desc="Tokenizing eval dataset",
                )

                eval_dataset = eval_dataset.map(
                    _process_tokens,
                    fn_kwargs=fn_kwargs,
                    num_proc=args.dataset_num_proc,
                    desc="Processing tokenized eval dataset",
                )

            # Get KL datasets if needed
            if self.calculate_KL:
                if args.per_device_train_batch_size <= 1:
                    raise ValueError(
                        "Actual (not effective) batch size must be > 1. KTO will not work properly because the KL term will be equivalent to the implied reward."
                    )

                # create pairs for estimating the KL term by flipping the matched pairs in each batch of size total_batch_size
                # i.e., [x_1, y_1], ..., [x_n, y_n] --> [x_1, y_n], ..., [x_n, y_1] = [x'_1, y'_1], ..., [x'_n, y'_n]
                train_kl_dataset = train_dataset.map(
                    _get_kl_dataset,
                    batched=True,
                    batch_size=args.per_device_train_batch_size,
                    num_proc=args.dataset_num_proc,
                    desc="Extracting KL train dataset",
                )

                fn_kwargs["prefix"] = "KL_"
                train_kl_dataset = train_kl_dataset.map(
                    _process_tokens,
                    fn_kwargs=fn_kwargs,
                    num_proc=args.dataset_num_proc,
                    remove_columns=[c for c in train_kl_dataset.column_names if c in train_dataset.column_names],
                    desc="Processing tokenized train KL dataset",
                )

                # merge the datasets
                train_dataset = concatenate_datasets([train_dataset, train_kl_dataset], axis=1)

                if eval_dataset is not None:
                    # Get KL dataset
                    eval_kl_dataset = eval_dataset.map(
                        _get_kl_dataset,
                        batched=True,
                        batch_size=args.per_device_train_batch_size,
                        num_proc=args.dataset_num_proc,
                        desc="Extracting eval KL dataset",
                    )

                    eval_kl_dataset = eval_kl_dataset.map(
                        _process_tokens,
                        fn_kwargs=fn_kwargs,
                        num_proc=args.dataset_num_proc,
                        remove_columns=[c for c in eval_kl_dataset.column_names if c in eval_dataset.column_names],
                        desc="Processing tokenized eval KL dataset",
                    )

                    # merge the datasets
                    eval_dataset = concatenate_datasets([eval_dataset, eval_kl_dataset], axis=1)

            # calculate dataset desirability balance
            num_desirable = max(sum(train_dataset["label"]), 1)
            num_undesirable = max(len(train_dataset["label"]) - num_desirable, 1)  # "label" is binary

            if num_desirable != num_undesirable:
                # The lower and upper bounds come from Eq. [8] of https://huggingface.co/papers/2402.01306
                des_weight_lower_bound = round((num_undesirable * self.undesirable_weight / num_desirable) * 1, 2)
                des_weight_upper_bound = round((num_undesirable * self.undesirable_weight / num_desirable) * 1.33, 2)
                und_weight_lower_bound = round((num_desirable * self.desirable_weight / num_undesirable) / 1.33, 2)
                und_weight_upper_bound = round((num_desirable * self.desirable_weight / num_undesirable) / 1, 2)

                des_weight_in_range = des_weight_lower_bound <= self.desirable_weight <= des_weight_upper_bound
                und_weight_in_range = und_weight_lower_bound <= self.undesirable_weight <= und_weight_upper_bound

                if not (des_weight_in_range or und_weight_in_range):
                    logger.warning(
                        "You have different amounts of desirable/positive and undesirable/negative examples but the "
                        "weights on the desirable and undesirable losses don't seem to be in an ideal range. Based "
                        f"on your data, we recommend EITHER "
                        f"desirable_weight in [{des_weight_lower_bound}, {des_weight_upper_bound}] or "
                        f"undesirable_weight in [{und_weight_lower_bound}, {und_weight_upper_bound}] (but NOT BOTH). "
                        "See the documentation on how to optimally set these weights.",
                    )

        super().__init__(
            model=model,
            args=args,
            data_collator=data_collator,
            train_dataset=train_dataset,
            eval_dataset=eval_dataset,
            processing_class=processing_class,
            model_init=model_init,
            compute_metrics=compute_metrics,
            callbacks=callbacks,
            optimizers=optimizers,
            preprocess_logits_for_metrics=preprocess_logits_for_metrics,
        )

        # Gradient accumulation requires scaled loss. Normally, loss scaling in the parent class depends on whether the
        # model accepts loss-related kwargs. Since we compute our own loss, this check is irrelevant. We set
        # self.model_accepts_loss_kwargs to False to enable scaling.
        self.model_accepts_loss_kwargs = False

        # Add tags for models that have been loaded with the correct transformers version
        if hasattr(self.model, "add_model_tags"):
            self.model.add_model_tags(self._tag_names)

        if not hasattr(self, "accelerator"):
            raise AttributeError(
                "Your `Trainer` does not have an `accelerator` object. Consider upgrading `transformers`."
            )

        # Deepspeed Zero-3 does not support precompute_ref_log_probs
        if self.is_deepspeed_enabled:
            if self.accelerator.state.deepspeed_plugin.zero_stage == 3 and self.precompute_ref_log_probs:
                raise ValueError(
                    "You cannot use `precompute_ref_log_probs=True` with Deepspeed ZeRO-3. Please set `precompute_ref_log_probs=False`."
                )

        if self.ref_model is None:
            if not (self.is_peft_model or self.precompute_ref_log_probs):
                raise ValueError(
                    "No reference model and model is not a Peft model. Try setting `precompute_ref_log_probs=True`"
                )
        else:
            if self.is_deepspeed_enabled:
                self.ref_model = prepare_deepspeed(self.ref_model, self.accelerator)
            else:
                self.ref_model = self.accelerator.prepare_model(self.ref_model, evaluation_mode=True)

        # Import Liger loss if enabled
        if self.args.use_liger_loss:
            if not is_liger_kernel_available():
                raise ImportError(
                    "You set `use_liger_loss=True` but the liger kernel is not available. "
                    "Please install liger-kernel first: `pip install liger-kernel`"
                )
            if self.loss_type in ["apo_zero_unpaired"]:
                raise ValueError(
                    "You cannot set `loss_type='apo_zero_unpaired'` with liger-kernel."
                    "Only KTO loss is supported with liger-kernel."
                )
            if self.precompute_ref_log_probs:
                raise ValueError(
                    "You cannot use `precompute_ref_log_probs=True` with liger kernel. Please set "
                    "`precompute_ref_log_probs=False`."
                )
            if self.is_peft_model or self.ref_adapter_name is not None:
                raise ValueError(
                    "You cannot use `use_liger_loss=True` with Peft models. Please set `use_liger_loss=False`."
                )
            self.kto_loss_fn = LigerFusedLinearKTOLoss(
                ignore_index=self.label_pad_token_id, beta=self.beta, use_ref_model=(self.ref_model is not None)
            )

    @contextmanager
    def null_ref_context(self):
        """Context manager for handling null reference model (that is, peft adapter manipulation)."""
        with (
            self.accelerator.unwrap_model(self.model).disable_adapter()
            if self.is_peft_model and not self.ref_adapter_name
            else nullcontext()
        ):
            if self.ref_adapter_name:
                self.model.set_adapter(self.ref_adapter_name)
            yield
            if self.ref_adapter_name:
                self.model.set_adapter(self.model_adapter_name or "default")

    def get_train_dataloader(self) -> DataLoader:
        """
        Returns the training [`~torch.utils.data.DataLoader`].

        Subclass of transformers.src.transformers.trainer.get_train_dataloader to precompute `ref_log_probs`.
        """

        if self.precompute_ref_log_probs and not self._precomputed_train_ref_log_probs:
            dataloader_params = {
                "batch_size": self.args.per_device_train_batch_size,
                "collate_fn": self.data_collator,
                "num_workers": self.args.dataloader_num_workers,
                "pin_memory": self.args.dataloader_pin_memory,
                "shuffle": False,
            }

            # prepare dataloader
            data_loader = self.accelerator.prepare(DataLoader(self.train_dataset, **dataloader_params))
            reference_completion_logps = []
            reference_KL_logps = []

            for padded_batch in tqdm(iterable=data_loader, desc="Train dataset reference log probs"):
                reference_completion_logp, reference_KL_logp = self.compute_reference_log_probs(padded_batch)

                reference_completion_logp = self.accelerator.gather_for_metrics(reference_completion_logp)
                reference_completion_logps.append(reference_completion_logp.cpu())

                if self.calculate_KL:
                    reference_KL_logp = self.accelerator.gather_for_metrics(reference_KL_logp)
                    reference_KL_logps.append(reference_KL_logp.cpu())

            self.train_dataset = self.train_dataset.add_column(
                name="reference_logps", column=torch.cat(reference_completion_logps).float().numpy()
            )

            if self.calculate_KL:
                self.train_dataset = self.train_dataset.add_column(
                    name="reference_KL_logps", column=torch.cat(reference_KL_logps).float().numpy()
                )

            self._precomputed_train_ref_log_probs = True

        return super().get_train_dataloader()

    def get_eval_dataloader(self, eval_dataset: Optional[Dataset] = None) -> DataLoader:
        """
        Returns the evaluation [`~torch.utils.data.DataLoader`].

        Subclass of transformers.src.transformers.trainer.get_eval_dataloader to precompute `ref_log_probs`.

        Args:
            eval_dataset (`torch.utils.data.Dataset`, *optional*):
                If provided, will override `self.eval_dataset`. If it is a [`~datasets.Dataset`], columns not accepted
                by the `model.forward()` method are automatically removed. It must implement `__len__`.
        """
        if eval_dataset is None and self.eval_dataset is None:
            raise ValueError("Trainer: evaluation requires an eval_dataset.")
        eval_dataset = eval_dataset if eval_dataset is not None else self.eval_dataset

        if self.precompute_ref_log_probs and not self._precomputed_eval_ref_log_probs:
            dataloader_params = {
                "batch_size": self.args.per_device_eval_batch_size,
                "collate_fn": self.data_collator,
                "num_workers": self.args.dataloader_num_workers,
                "pin_memory": self.args.dataloader_pin_memory,
                "shuffle": False,
            }

            # prepare dataloader
            data_loader = self.accelerator.prepare(DataLoader(eval_dataset, **dataloader_params))

            reference_completion_logps = []
            reference_KL_logps = []

            for padded_batch in tqdm(iterable=data_loader, desc="Eval dataset reference log probs"):
                reference_completion_logp, reference_KL_logp = self.compute_reference_log_probs(padded_batch)

                reference_completion_logp = self.accelerator.gather_for_metrics(reference_completion_logp)
                reference_completion_logps.append(reference_completion_logp.cpu())

                if self.calculate_KL:
                    reference_KL_logp = self.accelerator.gather_for_metrics(reference_KL_logp)
                    reference_KL_logps.append(reference_KL_logp.cpu())

            eval_dataset = eval_dataset.add_column(
                name="reference_logps", column=torch.cat(reference_completion_logps).float().numpy()
            )
            if self.calculate_KL:
                eval_dataset = eval_dataset.add_column(
                    name="reference_KL_logps", column=torch.cat(reference_KL_logps).float().numpy()
                )

            # Save calculated reference_chosen_logps and reference_rejected_logps to the eval_dataset for subsequent runs
            if self.eval_dataset is not None:
                self.eval_dataset = eval_dataset
            self._precomputed_eval_ref_log_probs = True

        return super().get_eval_dataloader(eval_dataset=eval_dataset)

    def compute_reference_log_probs(self, padded_batch: dict) -> dict:
        """Computes log probabilities of the reference model for a single padded batch of a KTO specific dataset."""
        with torch.no_grad():
            if self.ref_model is None:
                with self.null_ref_context():
                    if self.is_encoder_decoder:
                        completion_logits = self.model(
                            padded_batch["prompt_input_ids"],
                            attention_mask=padded_batch["prompt_attention_mask"],
                            decoder_input_ids=padded_batch.get("completion_decoder_input_ids"),
                            labels=padded_batch["completion_labels"],
                        ).logits

                        if self.calculate_KL:
                            KL_logits = self.model(
                                padded_batch["KL_prompt_input_ids"],
                                attention_mask=padded_batch["KL_prompt_attention_mask"],
                                decoder_input_ids=padded_batch.get("KL_completion_decoder_input_ids"),
                                labels=padded_batch["KL_completion_labels"],
                            ).logits
                    else:
                        completion_logits = self.model(
                            padded_batch["completion_input_ids"],
                            attention_mask=padded_batch["completion_attention_mask"],
                        ).logits

                        if self.calculate_KL:
                            KL_logits = self.model(
                                padded_batch["KL_completion_input_ids"],
                                attention_mask=padded_batch["KL_completion_attention_mask"],
                            ).logits
            else:
                if self.is_encoder_decoder:
                    completion_logits = self.ref_model(
                        padded_batch["prompt_input_ids"],
                        attention_mask=padded_batch["prompt_attention_mask"],
                        decoder_input_ids=padded_batch.get("completion_decoder_input_ids"),
                        labels=padded_batch["completion_labels"],
                    ).logits

                    if self.calculate_KL:
                        KL_logits = self.ref_model(
                            padded_batch["KL_prompt_input_ids"],
                            attention_mask=padded_batch["KL_prompt_attention_mask"],
                            decoder_input_ids=padded_batch.get("KL_completion_decoder_input_ids"),
                            labels=padded_batch["KL_completion_labels"],
                        ).logits
                else:
                    completion_logits = self.ref_model(
                        padded_batch["completion_input_ids"], attention_mask=padded_batch["completion_attention_mask"]
                    ).logits

                    if self.calculate_KL:
                        KL_logits = self.ref_model(
                            padded_batch["KL_completion_input_ids"],
                            attention_mask=padded_batch["KL_completion_attention_mask"],
                        ).logits

        completion_logps = self.get_batch_logps(
            completion_logits,
            padded_batch["completion_labels"],
            average_log_prob=False,
            is_encoder_decoder=self.is_encoder_decoder,
            label_pad_token_id=self.label_pad_token_id,
        )

        if self.calculate_KL:
            KL_logps = self.get_batch_logps(
                KL_logits,
                padded_batch["KL_completion_labels"],
                average_log_prob=False,
                is_encoder_decoder=self.is_encoder_decoder,
                label_pad_token_id=self.label_pad_token_id,
            )
        else:
            KL_logps = None

        return completion_logps, KL_logps

    @staticmethod
    def get_batch_logps(
        logits: torch.FloatTensor,
        labels: torch.LongTensor,
        average_log_prob: bool = False,
        label_pad_token_id: int = -100,
        is_encoder_decoder: bool = False,
    ) -> torch.FloatTensor:
        """Compute the log probabilities of the given labels under the given logits.

        Args:
            logits:
                Logits of the model (unnormalized). Shape: (batch_size, sequence_length, vocab_size)
            labels:
                Labels for which to compute the log probabilities. Label tokens with a value of label_pad_token_id are
                ignored. Shape: (batch_size, sequence_length)
            average_log_prob:
                If True, return the average log probability per (non-masked) token. Otherwise, return the sum of the
                log probabilities of the (non-masked) tokens.
            label_pad_token_id:
                The label value to ignore when computing log probabilities.
            is_encoder_decoder:
                Whether the model is an encoder-decoder model. If True, the labels are not shifted and the logits are
                assumed to already be aligned with the labels. If False, the labels are shifted to the right by one
                position, and the logits are assumed to be aligned with the shifted labels.

        Returns:
            A tensor of shape (batch_size,) containing the average/sum log probabilities of the given labels under the
            given logits.
        """
        if logits.shape[:-1] != labels.shape:
            raise ValueError("Logits (batch and sequence length dim) and labels must have the same shape.")

        if not is_encoder_decoder:
            labels = labels[:, 1:].clone()
            logits = logits[:, :-1, :]
        else:
            # Fixes end-dec RuntimeError
            labels = labels.clone()

        loss_mask = labels != label_pad_token_id

        # dummy token; we'll ignore the losses on these tokens later
        labels[labels == label_pad_token_id] = 0

        per_token_logps = selective_log_softmax(logits, labels)

        if average_log_prob:
            return (per_token_logps * loss_mask).sum(-1) / loss_mask.sum(-1)
        else:
            return (per_token_logps * loss_mask).sum(-1)

    def forward(
        self, model: nn.Module, batch: dict[str, Union[list, torch.LongTensor]]
    ) -> tuple[torch.FloatTensor, torch.FloatTensor, torch.FloatTensor, torch.FloatTensor]:
        KL_logps = self._compute_kl_logps(model, batch)

        model_kwargs = (
            {
                "labels": batch["completion_labels"],
                "decoder_input_ids": batch.get("completion_decoder_input_ids"),
            }
            if self.is_encoder_decoder
            else {}
        )
        if self.aux_loss_enabled:
            model_kwargs["output_router_logits"] = True

        outputs = model(
            batch["completion_input_ids"],
            attention_mask=batch["completion_attention_mask"],
            **model_kwargs,
        )
        completion_logits = outputs.logits

        completion_logps = self.get_batch_logps(
            completion_logits,
            batch["completion_labels"],
            average_log_prob=False,
            is_encoder_decoder=self.is_encoder_decoder,
            label_pad_token_id=self.label_pad_token_id,
        )

        if completion_logps.shape[0] != len(batch["label"]):
            raise ValueError(
                "There is a mismatch between the number of examples in this batch and the number of "
                "examples for which an output sequence was predicted."
            )

        chosen_idx = [i for i in range(completion_logps.shape[0]) if batch["label"][i] is True]
        rejected_idx = [i for i in range(completion_logps.shape[0]) if batch["label"][i] is False]

        chosen_logps = completion_logps[chosen_idx, ...]
        rejected_logps = completion_logps[rejected_idx, ...]

        chosen_logits = completion_logits[chosen_idx, ...]
        rejected_logits = completion_logits[rejected_idx, ...]

        if self.aux_loss_enabled:
            return (chosen_logps, rejected_logps, chosen_logits, rejected_logits, KL_logps, outputs.aux_loss)
        else:
            return (chosen_logps, rejected_logps, chosen_logits, rejected_logits, KL_logps)

    def kto_loss(
        self,
        policy_chosen_logps: torch.FloatTensor,
        policy_rejected_logps: torch.FloatTensor,
        policy_KL_logps: torch.FloatTensor,
        reference_chosen_logps: torch.FloatTensor,
        reference_rejected_logps: torch.FloatTensor,
        reference_KL_logps: torch.FloatTensor,
    ) -> tuple[torch.FloatTensor, torch.FloatTensor, torch.FloatTensor, torch.FloatTensor]:
        """Compute the KTO loss for a batch of policy and reference model log probabilities.

        Args:
            policy_chosen_logps:
                Log probabilities of the policy model for the chosen responses. Shape: (num(chosen) in batch_size,)
            policy_rejected_logps:
                Log probabilities of the policy model for the rejected responses. Shape: (num(rejected) in batch_size,)
            policy_KL_logps: Log probabilities of the policy model for the KL responses. Shape: (batch_size,)
            reference_chosen_logps:
                Log probabilities of the reference model for the chosen responses. Shape: (num(chosen) in batch_size,)
            reference_rejected_logps:
                Log probabilities of the reference model for the rejected responses. Shape: (num(rejected) in
                batch_size,)
            reference_KL_logps: Log probabilities of the reference model for the KL responses. Shape: (batch_size,)

        Returns:
            A tuple of four tensors: (losses, chosen_rewards, rejected_rewards, KL). The losses tensor contains the KTO
            loss for each example in the batch. The chosen_rewards and rejected_rewards tensors contain the rewards for
            the chosen and rejected responses, respectively. The KL tensor contains the detached KL divergence estimate
            between the policy and reference models.
        """
        if self.calculate_KL:
            kl = (policy_KL_logps - reference_KL_logps).mean().detach()
            kl = self.accelerator.gather_for_metrics(kl).mean().clamp(min=0)
        else:
            kl = torch.zeros(1).to(policy_chosen_logps.device)

        # Chosen losses
        if policy_chosen_logps.shape[0] != 0 or reference_chosen_logps.shape[0] != 0:
            chosen_logratios = policy_chosen_logps - reference_chosen_logps

            if self.loss_type == "kto":
                # Eqn (7) of the KTO paper (https://huggingface.co/papers/2402.01306)
                chosen_losses = 1 - F.sigmoid(self.beta * (chosen_logratios - kl))
            elif self.loss_type == "apo_zero_unpaired":
                # Unpaired variant of Eqn (7) of the APO paper (https://huggingface.co/papers/2408.06266)
                # Use this loss when you believe the chosen outputs are better than your model's default output
                chosen_losses = 1 - F.sigmoid(self.beta * chosen_logratios)

            chosen_rewards = self.beta * chosen_logratios.detach()

        else:
            # lists can't be empty -- if they are, then accelerate.gather will hang
            chosen_losses = torch.Tensor([]).to(self.accelerator.device)
            chosen_rewards = torch.Tensor([]).to(self.accelerator.device)

        # Rejected losses
        if policy_rejected_logps.shape[0] != 0 or reference_rejected_logps.shape[0] != 0:
            rejected_logratios = policy_rejected_logps - reference_rejected_logps

            if self.loss_type == "kto":
                rejected_losses = 1 - F.sigmoid(self.beta * (kl - rejected_logratios))
            elif self.loss_type == "apo_zero_unpaired":
                rejected_losses = F.sigmoid(self.beta * rejected_logratios)

            rejected_rewards = self.beta * rejected_logratios.detach()
        else:
            # lists can't be empty -- if they are, then accelerate.gather will hang
            rejected_losses = torch.Tensor([]).to(self.accelerator.device)
            rejected_rewards = torch.Tensor([]).to(self.accelerator.device)

        losses = torch.cat(
            (self.desirable_weight * chosen_losses, self.undesirable_weight * rejected_losses),
            0,
        )

        return losses, chosen_rewards, rejected_rewards, kl

    def _compute_kl_logps(self, model, batch):
        """Compute KL log probabilities for a given batch."""
        KL_logps = None
        if self.calculate_KL:
            if self.is_encoder_decoder:
                KL_model_kwargs = {
                    "input_ids": batch["KL_prompt_input_ids"],
                    "attention_mask": batch["KL_prompt_attention_mask"],
                    "labels": batch["KL_completion_labels"],
                    "decoder_input_ids": batch.get("KL_completion_decoder_input_ids"),
                }
            else:
                KL_model_kwargs = {
                    "input_ids": batch["KL_completion_input_ids"],
                    "attention_mask": batch["KL_completion_attention_mask"],
                }

            with torch.no_grad():
                KL_logits = model(**KL_model_kwargs).logits

            KL_logps = self.get_batch_logps(
                KL_logits,
                batch["KL_completion_labels"],
                average_log_prob=False,
                is_encoder_decoder=self.is_encoder_decoder,
                label_pad_token_id=self.label_pad_token_id,
            )
        return KL_logps

    def _compute_loss_liger(self, model, batch):
        """
        Compute the KTO loss using the Liger-Kernel's LigerFusedLinearKTOLoss.

        Args:
            model:
                The policy model used for generating log probabilities and outputs. It could be an encoder-decoder
                model or a regular language model.
            batch: A dictionary containing the input data and labels for the batch.

        Returns:
            A dictionary containing the following keys:
                - "loss": The computed KTO loss for the batch.
                - "chosen_logits_sum": Sum of the logits for the chosen responses from the policy model.
                - "rejected_logits_sum": Sum of the logits for the rejected responses from the policy model.
                - "chosen_logps": Log probabilities of the chosen responses from the policy model.
                - "rejected_logps": Log probabilities of the rejected responses from the policy model.
                - "chosen_rewards": Rewards for the chosen responses.
                - "rejected_rewards": Rewards for the rejected responses.
                - "kl": The KL divergence between the policy and reference models (detached).

            If auxiliary loss is enabled, the dictionary will also include:
                - "aux_loss": The auxiliary loss from the model outputs.
        """
        policy_KL_logps = self._compute_kl_logps(model, batch)
        reference_KL_logps = self._compute_kl_logps(self.ref_model, batch)
        if self.calculate_KL:
            kl = (policy_KL_logps - reference_KL_logps).mean().detach()
            kl = self.accelerator.gather_for_metrics(kl).mean().clamp(min=0)
        else:
            kl = torch.zeros(1).to(self.accelerator.device)

        model_kwargs = (
            {
                "labels": batch["completion_labels"],
                "decoder_input_ids": batch.get("completion_decoder_input_ids"),
            }
            if self.is_encoder_decoder
            else {}
        )
        if self.aux_loss_enabled:
            model_kwargs["output_router_logits"] = True

        if self.is_encoder_decoder:
            # 1. Get encoder outputs
            encoder_outputs = model.get_encoder()(
                batch["completion_input_ids"],
                attention_mask=batch["completion_attention_mask"],
                return_dict=True,
                **model_kwargs,
            )
            # 2. Get decoder outputs
            outputs = model.get_decoder()(
                input_ids=model_kwargs["decoder_input_ids"],
                encoder_hidden_states=encoder_outputs.last_hidden_state,
                use_cache=False,
                **model_kwargs,
            )
            # 1. Get reference encoder outputs
            ref_encoder_outputs = self.ref_model.get_encoder()(
                batch["completion_input_ids"],
                attention_mask=batch["completion_attention_mask"],
                return_dict=True,
                **model_kwargs,
            )
            # 2. Get reference decoder outputs
            ref_outputs = self.ref_model.get_decoder()(
                input_ids=model_kwargs["decoder_input_ids"],
                encoder_hidden_states=ref_encoder_outputs.last_hidden_state,
                use_cache=False,
                **model_kwargs,
            )
        else:
            # skip the lm head and get the last hidden state
            if hasattr(model, "get_decoder") and model.get_decoder() is not None:
                base_model = model.get_decoder()
            else:
                base_attr = getattr(model, "base_model_prefix", self.args.base_model_attribute_name)
                base_model = getattr(model, base_attr, model)
            outputs = base_model(
                batch["completion_input_ids"],
                attention_mask=batch["completion_attention_mask"],
                use_cache=False,
                **model_kwargs,
            )

            # reference model
            if hasattr(self.ref_model, "get_decoder") and self.ref_model.get_decoder() is not None:
                ref_base_model = self.ref_model.get_decoder()
            else:
                ref_attr = getattr(self.ref_model, "base_model_prefix", self.args.base_model_attribute_name)
                ref_base_model = getattr(self.ref_model, ref_attr, self.ref_model)
            ref_outputs = ref_base_model(
                batch["completion_input_ids"],
                attention_mask=batch["completion_attention_mask"],
                use_cache=False,
                **model_kwargs,
            )
        lm_head = model.get_output_embeddings()
        ref_lm_head = self.ref_model.get_output_embeddings()

        (
            loss,
            (
                chosen_logps_sum,
                rejected_logps_sum,
                chosen_logits_sum,
                rejected_logits_sum,
                chosen_rewards_sum,
                rejected_rewards_sum,
            ),
        ) = self.kto_loss_fn(
            _input=outputs.last_hidden_state[:, :-1] if not self.is_encoder_decoder else outputs.last_hidden_state,
            lin_weight=lm_head.weight,
            target=batch["completion_labels"][:, 1:],
            bias=lm_head.bias if hasattr(lm_head, "bias") else None,
            preference_labels=torch.tensor(batch["label"], dtype=torch.bool).to(self.accelerator.device),
            ref_input=ref_outputs.last_hidden_state[:, :-1]
            if not self.is_encoder_decoder
            else outputs.last_hidden_state,
            ref_weight=ref_lm_head.weight,
            ref_bias=ref_lm_head.bias if hasattr(lm_head, "bias") else None,
            kl=kl,
        )

        output = {
            "loss": loss,
            "chosen_logits_sum": chosen_logits_sum,
            "rejected_logits_sum": rejected_logits_sum,
            "chosen_logps_sum": chosen_logps_sum,
            "rejected_logps_sum": rejected_logps_sum,
            "chosen_rewards_sum": chosen_rewards_sum,
            "rejected_rewards_sum": rejected_rewards_sum,
            "kl": kl,
        }
        if self.aux_loss_enabled:
            output["aux_loss"] = outputs.aux_loss

        return output

    def get_batch_loss_metrics(
        self,
        model,
        batch: dict[str, Union[list, torch.LongTensor]],
    ):
        """Compute the KTO loss and other metrics for the given batch of inputs for train or test."""
        metrics = {}
        batch = {k: (v.to(self.accelerator.device) if isinstance(v, torch.Tensor) else v) for k, v in batch.items()}

        labels = torch.tensor(batch["label"])
        num_chosen = labels.sum().to(self.accelerator.device)
        num_rejected = (len(labels) - num_chosen).to(self.accelerator.device)

        if self.args.use_liger_loss:
            model_output = self._compute_loss_liger(model, batch)
            losses = model_output["loss"]
            policy_chosen_logits = model_output["chosen_logits_sum"]
            policy_rejected_logits = model_output["rejected_logits_sum"]
            policy_chosen_logps = model_output["chosen_logps_sum"]
            policy_rejected_logps = model_output["rejected_logps_sum"]
            chosen_rewards = model_output["chosen_rewards_sum"]
            rejected_rewards = model_output["rejected_rewards_sum"]
            kl = model_output["kl"]
            if self.aux_loss_enabled:
                aux_loss = model_output["aux_loss"]
        else:
            forward_output = self.forward(model, batch)
            (
                policy_chosen_logps,
                policy_rejected_logps,
                policy_chosen_logits,
                policy_rejected_logits,
                policy_KL_logps,
            ) = forward_output[:5]
            if self.aux_loss_enabled:
                aux_loss = forward_output[5]

            # if reference_logps in batch use them, otherwise use the reference model
            if "reference_logps" in batch:
                chosen_idx = [i for i in range(batch["reference_logps"].shape[0]) if batch["label"][i] is True]
                rejected_idx = [i for i in range(batch["reference_logps"].shape[0]) if batch["label"][i] is False]

                reference_chosen_logps = batch["reference_logps"][chosen_idx, ...]
                reference_rejected_logps = batch["reference_logps"][rejected_idx, ...]
                if self.calculate_KL:
                    reference_KL_logps = batch["reference_KL_logps"]
                else:
                    reference_KL_logps = None
            else:
                with torch.no_grad():
                    if self.ref_model is None:
                        with self.null_ref_context():
                            (
                                reference_chosen_logps,
                                reference_rejected_logps,
                                _,
                                _,
                                reference_KL_logps,
                            ) = self.forward(self.model, batch)[:5]
                    else:
                        (
                            reference_chosen_logps,
                            reference_rejected_logps,
                            _,
                            _,
                            reference_KL_logps,
                        ) = self.forward(self.ref_model, batch)[:5]

            losses, chosen_rewards, rejected_rewards, kl = self.kto_loss(
                policy_chosen_logps,
                policy_rejected_logps,
                policy_KL_logps,
                reference_chosen_logps,
                reference_rejected_logps,
                reference_KL_logps,
            )

        metrics["kl"] = kl.item()

        all_num_chosen = self.accelerator.gather_for_metrics(num_chosen).sum().item()
        all_num_rejected = self.accelerator.gather_for_metrics(num_rejected).sum().item()

        if all_num_chosen > 0:
            metrics["rewards/chosen_sum"] = (
                self.accelerator.gather_for_metrics(chosen_rewards.nansum()).nansum().item()
            )
            metrics["logps/chosen_sum"] = (
                self.accelerator.gather_for_metrics(policy_chosen_logps.nansum()).nansum().item()
            )
            metrics["logits/chosen_sum"] = (
                self.accelerator.gather_for_metrics(policy_chosen_logits.nansum()).nansum().item()
            )
            metrics["count/chosen"] = all_num_chosen

        if all_num_rejected > 0:
            metrics["rewards/rejected_sum"] = (
                self.accelerator.gather_for_metrics(rejected_rewards.nansum()).nansum().item()
            )
            metrics["logps/rejected_sum"] = (
                self.accelerator.gather_for_metrics(policy_rejected_logps.nansum()).nansum().item()
            )
            metrics["logits/rejected_sum"] = (
                self.accelerator.gather_for_metrics(policy_rejected_logits.nansum()).nansum().item()
            )
            metrics["count/rejected"] = all_num_rejected

        loss = losses.nanmean()
        if self.aux_loss_enabled:
            loss += self.aux_loss_coef * aux_loss

        return loss, metrics

    def compute_loss(
        self,
        model: Union[PreTrainedModel, nn.Module],
        inputs: dict[str, Union[torch.Tensor, Any]],
        return_outputs=False,
        num_items_in_batch=None,
    ) -> Union[torch.Tensor, tuple[torch.Tensor, dict[str, torch.Tensor]]]:
        compute_loss_context_manager = (
            autocast(self.accelerator.device.type) if self._peft_has_been_casted_to_bf16 else nullcontext()
        )

        with compute_loss_context_manager:
            loss, metrics = self.get_batch_loss_metrics(model, inputs)

        # Make sure to move the loss to the device the original accumulating loss is at back in the `Trainer` class:
        loss = loss.to(self.args.device)
        # force log the metrics
        if self.accelerator.is_main_process:
            self.store_metrics(metrics, train_eval="train")

        if return_outputs:
            return (loss, metrics)
        return loss

    def store_metrics(self, metrics: dict[str, float], train_eval: Literal["train", "eval"] = "train") -> None:
        for key, value in metrics.items():
            self._stored_metrics[train_eval][key].append(value)

    def _get_train_sampler(self, dataset: Optional[Dataset] = None) -> Optional[torch.utils.data.Sampler]:
        if dataset is None:
            dataset = self.train_dataset
        if dataset is None or not has_length(dataset):
            return None
        return SequentialSampler(dataset)

    def generate_from_model_and_ref(self, model, batch: dict[str, torch.LongTensor]) -> tuple[str, str]:
        """Generate samples from the model and reference model for the given batch of inputs."""

        # If one uses `generate_during_eval` with peft + bf16, we need to explicitly call generate with
        # the torch amp context manager as some hidden states are silently casted to full precision.
        generate_context_manager = (
            autocast(self.accelerator.device.type) if self._peft_has_been_casted_to_bf16 else nullcontext()
        )

        with generate_context_manager:
            policy_output = model.generate(
                input_ids=batch["prompt_input_ids"],
                attention_mask=batch["prompt_attention_mask"],
                max_length=self.max_length,
                do_sample=True,
                pad_token_id=self.processing_class.pad_token_id,
            )

            # if reference_output in batch use that otherwise use the reference model
            if "reference_output" in batch:
                reference_output = batch["reference_output"]
            else:
                if self.ref_model is None:
                    with self.null_ref_context():
                        reference_output = self.model.generate(
                            input_ids=batch["prompt_input_ids"],
                            attention_mask=batch["prompt_attention_mask"],
                            max_length=self.max_length,
                            do_sample=True,
                            pad_token_id=self.processing_class.pad_token_id,
                        )
                else:
                    reference_output = self.ref_model.generate(
                        input_ids=batch["prompt_input_ids"],
                        attention_mask=batch["prompt_attention_mask"],
                        max_length=self.max_length,
                        do_sample=True,
                        pad_token_id=self.processing_class.pad_token_id,
                    )

        policy_output = pad_to_length(policy_output, self.max_length, self.processing_class.pad_token_id)
        policy_output_decoded = self.processing_class.batch_decode(policy_output, skip_special_tokens=True)

        reference_output = pad_to_length(reference_output, self.max_length, self.processing_class.pad_token_id)
        reference_output_decoded = self.processing_class.batch_decode(reference_output, skip_special_tokens=True)

        return policy_output_decoded, reference_output_decoded

    def prediction_step(
        self,
        model: Union[PreTrainedModel, nn.Module],
        inputs: dict[str, Union[torch.Tensor, Any]],
        prediction_loss_only: bool,
        ignore_keys: Optional[list[str]] = None,
    ):
        if ignore_keys is None:
            if hasattr(model, "config"):
                ignore_keys = getattr(model.config, "keys_to_ignore_at_inference", [])
            else:
                ignore_keys = []

        prediction_context_manager = (
            autocast(self.accelerator.device.type) if self._peft_has_been_casted_to_bf16 else nullcontext()
        )
        with torch.no_grad(), prediction_context_manager:
            loss, metrics = self.get_batch_loss_metrics(model, inputs)

        # force log the metrics
        if self.accelerator.is_main_process:
            self.store_metrics(metrics, train_eval="eval")

        if prediction_loss_only:
            return (loss.detach(), None, None)

        # logits for the chosen and rejected samples from model
        logits_dict = {}
        if "logits/chosen_sum" in metrics:
            logits_dict["eval_logits/chosen"] = metrics["logits/chosen_sum"]
        if "logits/rejected_sum" in metrics:
            logits_dict["eval_logits/rejected"] = metrics["logits/rejected_sum"]
        logits = [v for k, v in logits_dict.items() if k not in ignore_keys]
        logits = torch.tensor(logits, device=self.accelerator.device)
        labels = torch.zeros(logits.shape[0], device=self.accelerator.device)

        return (loss.detach(), logits, labels)

    def evaluation_loop(
        self,
        dataloader: DataLoader,
        description: str,
        prediction_loss_only: Optional[bool] = None,
        ignore_keys: Optional[list[str]] = None,
        metric_key_prefix: str = "eval",
    ) -> EvalLoopOutput:
        """
        Overriding built-in evaluation loop to store metrics for each batch. Prediction/evaluation loop, shared by
        `Trainer.evaluate()` and `Trainer.predict()`.

        Works both with or without labels.
        """

        # Sample and save to game log if requested (for one batch to save time)
        if self.generate_during_eval:
            # Generate random indices within the range of the total number of samples
            num_samples = len(dataloader.dataset)
            random_indices = random.sample(range(num_samples), k=self.args.eval_batch_size)

            # Use dataloader.dataset.select to get the random batch without iterating over the DataLoader
            random_batch_dataset = dataloader.dataset.select(random_indices)
            random_batch = self.data_collator(random_batch_dataset)
            random_batch = self._prepare_inputs(random_batch)

            target_labels = torch.tensor(random_batch["label"], dtype=torch.bool, device=self.accelerator.device)
            target_indices = torch.where(~target_labels)[0]
            target_batch = {
                "prompt_input_ids": random_batch["prompt_input_ids"][target_indices],
                "prompt_attention_mask": random_batch["prompt_attention_mask"][target_indices],
                "prompt": itemgetter(*target_indices)(random_batch["prompt"]),
            }
            policy_output_decoded, ref_output_decoded = self.generate_from_model_and_ref(self.model, target_batch)

            table = pd.DataFrame(
                columns=["Prompt", "Policy", "Ref Model"],
                data=[
                    [prompt, pol[len(prompt) :], ref[len(prompt) :]]
                    for prompt, pol, ref in zip(target_batch["prompt"], policy_output_decoded, ref_output_decoded)
                ],
            )
            if "wandb" in self.args.report_to:
                wandb.log({"game_log": wandb.Table(data=table)})

            if "comet_ml" in self.args.report_to:
                log_table_to_comet_experiment(
                    name="game_log.csv",
                    table=table,
                )

        # Base evaluation
        initial_output = super().evaluation_loop(
            dataloader, description, prediction_loss_only, ignore_keys, metric_key_prefix
        )

        return initial_output

    def log(self, logs: dict[str, float], start_time: Optional[float] = None) -> None:
        """
        Log `logs` on the various objects watching training, including stored metrics.

        Args:
            logs (`dict[str, float]`):
                The values to log.
            start_time (`float`, *optional*):
                Start time of the training.
        """
        # logs either has 'loss' or 'eval_loss'
        train_eval = "train" if "loss" in logs else "eval"
        # train metrics should have no prefix, eval should have 'eval_'
        prefix = "eval_" if train_eval == "eval" else ""
        # accumulate average metrics from sums and lengths
        for split in ["chosen", "rejected"]:
            if f"count/{split}" in self._stored_metrics[train_eval]:
                count_sum = torch.Tensor(self._stored_metrics[train_eval][f"count/{split}"]).sum().item()
                for metric in ["rewards", "logps", "logits"]:
                    logs[f"{prefix}{metric}/{split}"] = (
                        torch.Tensor(self._stored_metrics[train_eval][f"{metric}/{split}_sum"]).sum().item()
                        / count_sum
                    )
                    # delete obsolete metric
                    del self._stored_metrics[train_eval][f"{metric}/{split}_sum"]
                del self._stored_metrics[train_eval][f"count/{split}"]
        # calculate reward margin
        if f"{prefix}rewards/chosen" in logs and f"{prefix}rewards/rejected" in logs:
            logs[f"{prefix}rewards/margins"] = logs[f"{prefix}rewards/chosen"] - logs[f"{prefix}rewards/rejected"]
        # Add averaged stored metrics to logs
        for key, metrics in self._stored_metrics[train_eval].items():
            logs[f"{prefix}{key}"] = torch.Tensor(metrics).mean().item()
        del self._stored_metrics[train_eval]
        return super().log(logs, start_time)

    # Ensure the model card is saved along with the checkpoint
    def _save_checkpoint(self, model, trial):
        if self.args.hub_model_id is None:
            model_name = Path(self.args.output_dir).name
        else:
            model_name = self.args.hub_model_id.split("/")[-1]
        self.create_model_card(model_name=model_name)
        super()._save_checkpoint(model, trial)
class UnslothKTOTrainer(_UnslothKTOTrainer):
    """
    
    Initialize KTOTrainer.

    Args:
        model ([`~transformers.PreTrainedModel`]):
            The model to train, preferably an [`~transformers.AutoModelForSequenceClassification`].
        ref_model ([`PreTrainedModelWrapper`]):
            Hugging Face transformer model with a casual language modelling head. Used for implicit reward computation
            and loss. If no reference model is provided, the trainer will create a reference model with the same
            architecture as the model to be optimized.
        args ([`KTOConfig`]):
            The arguments to use for training.
        train_dataset ([`~datasets.Dataset`]):
            The dataset to use for training.
        eval_dataset ([`~datasets.Dataset`]):
            The dataset to use for evaluation.
        processing_class ([`~transformers.PreTrainedTokenizerBase`], [`~transformers.BaseImageProcessor`], [`~transformers.FeatureExtractionMixin`] or [`~transformers.ProcessorMixin`], *optional*):
            Processing class used to process the data. If provided, will be used to automatically process the inputs
            for the model, and it will be saved along the model to make it easier to rerun an interrupted training or
            reuse the fine-tuned model.
        data_collator ([`~transformers.DataCollator`], *optional*):
            The data collator to use for training. If None is specified, the default data collator
            ([`DPODataCollatorWithPadding`]) will be used which will pad the sequences to the maximum length of the
            sequences in the batch, given a dataset of paired sequences.
        model_init (`Callable[[], transformers.PreTrainedModel]`):
            The model initializer to use for training. If None is specified, the default model initializer will be
            used.
        callbacks (`list[transformers.TrainerCallback]`):
            The callbacks to use for training.
        optimizers (`tuple[torch.optim.Optimizer, torch.optim.lr_scheduler.LambdaLR]`):
            The optimizer and scheduler to use for training.
        preprocess_logits_for_metrics (`Callable[[torch.Tensor, torch.Tensor], torch.Tensor]`):
            The function to use to preprocess the logits before computing the metrics.
        peft_config (`dict`, defaults to `None`):
            The PEFT configuration to use for training. If you pass a PEFT configuration, the model will be wrapped in
            a PEFT model.
        compute_metrics (`Callable[[EvalPrediction], dict]`, *optional*):
            The function to use to compute the metrics. Must take a `EvalPrediction` and return a dictionary string to
            metric values.
        model_adapter_name (`str`, defaults to `None`):
            Name of the train target PEFT adapter, when using LoRA with multiple adapters.
        ref_adapter_name (`str`, defaults to `None`):
            Name of the reference PEFT adapter, when using LoRA with multiple adapters.
    
    """
    def __init__(
        self,
        model = None,
        ref_model = None,
        args = None,
        train_dataset = None,
        eval_dataset = None,
        processing_class = None,
        data_collator = None,
        model_init = None,
        callbacks = None,
        preprocess_logits_for_metrics = None,
        peft_config = None,
        compute_metrics = None,
        model_adapter_name = None,
        ref_adapter_name = None,
        **kwargs
    ):
        if args is None: args = UnslothKTOConfig()
        use_bf16 = getattr(args, 'bf16', False)
        if type(use_bf16) is not bool: use_bf16 = False
        use_fp16 = getattr(args, 'fp16', False)
        if type(use_fp16) is not bool: use_fp16 = False
        force_float32 = False
        full_finetuning = os.environ.get('UNSLOTH_ENABLE_FULL_FINETUNING', '0') == '1'
        if not full_finetuning and (os.environ.get('UNSLOTH_FORCE_FLOAT32', '0') == '1'):
            print('Unsloth: Switching to float32 training since model cannot work with float16')
            force_float32 = True
        mixed_precision_dtype = os.environ.get('UNSLOTH_MIXED_PRECISION', 'float32')
        dtype = getattr(model.config, 'dtype', None) or getattr(model.config, 'torch_dtype', None)
        if dtype is None: dtype = model.get_input_embeddings().weight.dtype
        from unsloth_zoo.utils import _get_dtype
        dtype = _get_dtype(dtype)
        float16 = dtype == torch.float16
        if not force_float32 and (float16 and use_bf16): raise TypeError('Unsloth: Model is in float16 precision but you want to use bfloat16 precision. Set fp16 to `True` and bf16 to `False`')
        if not force_float32 and (not float16 and use_fp16): raise TypeError('Unsloth: Model is in bfloat16 precision but you want to use float16 precision. Set fp16 to `False` and bf16 to `True`')
        if force_float32:
            # Forced float32 training
            args.fp16 = False
            args.bf16 = False
            os.environ['ACCELERATE_MIXED_PRECISION'] = 'no'
            if hasattr(args, 'mixed_precision'): args.mixed_precision = 'no'
            # args.mixed_precision is a new argument which needs to be set now
        elif (not use_bf16 and not use_fp16) and mixed_precision_dtype == 'float32':
            # Mixed precision training
            args.fp16 = float16
            args.bf16 = not float16
            os.environ['ACCELERATE_MIXED_PRECISION'] = 'fp16' if float16 else 'bf16'
            if hasattr(args, 'mixed_precision'): args.mixed_precision = 'fp16' if float16 else 'bf16'
            # args.mixed_precision is a new argument which needs to be set now
        elif mixed_precision_dtype == 'bfloat16':
            # Both False since bfloat16 full finetuning doesn't do any autocasting.
            args.fp16 = False
            args.bf16 = False
            os.environ['ACCELERATE_MIXED_PRECISION'] = 'no'
            if hasattr(args, 'mixed_precision'): args.mixed_precision = 'no'
            # args.mixed_precision is a new argument which needs to be set now
        
        if getattr(args, 'eval_dataset', None) is not None and getattr(args, 'eval_strategy', 'no') == 'no':
            args.eval_strategy = 'steps'
            if getattr(args, 'eval_steps', None) is None: args.eval_steps = 0.1
        ga_steps = getattr(args, 'gradient_accumulation_steps', None)
        if ga_steps is not None and ga_steps > 1:
            from transformers import __version__ as transformers_version
            if Version(transformers_version) <= Version('4.45.2'):
                print('**** Unsloth: Please use our fixed gradient_accumulation_steps by updating transformers, TRL and Unsloth!\n'
                      '`pip install --upgrade --no-cache-dir --force-reinstall --no-deps unsloth transformers trl unsloth_zoo`')
        if getattr(args, 'eval_strategy', 'no') != 'no':
            eval_bsz = getattr(args, 'per_device_eval_batch_size', 8)
            if eval_bsz == 8 and args.per_device_train_batch_size < eval_bsz: args.per_device_eval_batch_size = args.per_device_train_batch_size
            if getattr(args, 'eval_accumulation_steps', None) is None and ga_steps is not None: args.eval_accumulation_steps = ga_steps
        fp16_full_eval = getattr(args, 'fp16_full_eval', False)
        if type(fp16_full_eval) is not bool: fp16_full_eval = False
        bf16_full_eval = getattr(args, 'bf16_full_eval', False)
        if type(bf16_full_eval) is not bool: bf16_full_eval = False
        if args.fp16 and bf16_full_eval: args.bf16_full_eval = False; args.fp16_full_eval = True
        if args.bf16 and fp16_full_eval: args.bf16_full_eval = True; args.fp16_full_eval = False
        if force_float32:
            args.bf16_full_eval = False
            args.fp16_full_eval = False
        elif os.environ.get('UNSLOTH_MIXED_PRECISION', 'float32') == 'bfloat16':
            args.bf16_full_eval = True
            args.fp16_full_eval = False
        elif not bf16_full_eval and not fp16_full_eval:
            args.bf16_full_eval = args.bf16
            args.fp16_full_eval = args.fp16
        _output_logits = False
        if locals().get('compute_metrics', None) is not None: _output_logits = True
        if locals().get('preprocess_logits_for_metrics', None) is not None: _output_logits = True
        if _output_logits:
            os.environ['UNSLOTH_RETURN_LOGITS'] = '1'
        if 'max_seq_length' not in locals() and not hasattr(args, 'max_seq_length'):
            pass
        else:
            model_max_seq_length = getattr(model, 'max_seq_length', None)
            args_max_seq_length  = getattr(args,  'max_seq_length', None)
            if args_max_seq_length is None and model_max_seq_length is not None:
                max_seq_length = model.max_seq_length
                if hasattr(args, 'max_seq_length'): args.max_seq_length = max_seq_length
            elif args_max_seq_length is not None and model_max_seq_length is not None:
                if args_max_seq_length > model_max_seq_length:
                    print('Unsloth: You set `max_seq_length` as ' + str(args_max_seq_length) + ' but '
                           'the maximum the model supports is ' + str(model_max_seq_length) + '. We shall reduce it.')
                    args.max_seq_length = model_max_seq_length
        if model is not None and hasattr(model, 'for_training'):
            model.for_training(use_gradient_checkpointing=getattr(args, 'gradient_checkpointing', True))
        if 'tokenizer' in locals() and hasattr(tokenizer, 'padding_side'): tokenizer.padding_side = 'right'
        if 'processing_class' in locals():
            if hasattr(processing_class, 'padding_side'): processing_class.padding_side = 'right'
            if hasattr(processing_class, 'tokenizer') and hasattr(processing_class.tokenizer, 'padding_side'): processing_class.tokenizer.padding_side = 'right'
        __tokenizer = processing_class if 'processing_class' in locals() else tokenizer
        from unsloth_zoo.vision_utils import UnslothVisionDataCollator
        if not isinstance(data_collator, UnslothVisionDataCollator):
            if isinstance(data_collator, DataCollatorForSeq2Seq) and 'labels' not in train_dataset.column_names:
                data_collator = TransformersDataCollatorForLanguageModeling(
                    __tokenizer,
                    mlm = False,
                    mlm_probability = 0.0,
                    pad_to_multiple_of = getattr(args, 'pad_to_multiple_of', None),
                )
            elif isinstance(data_collator, TransformersDataCollatorForLanguageModeling) and 'labels' in train_dataset.column_names:
                data_collator = DataCollatorForSeq2Seq(
                    __tokenizer,
                    pad_to_multiple_of = getattr(args, 'pad_to_multiple_of', None),
                )
        else:
            if hasattr(args, 'remove_unused_columns'): args.remove_unused_columns = False
            if hasattr(args, 'dataset_text_field'): args.dataset_text_field = ''
            if hasattr(args, 'dataset_kwargs'): args.dataset_kwargs = {'skip_prepare_dataset': True}
        if not isinstance(data_collator, UnslothVisionDataCollator):
            if not hasattr(__tokenizer, 'pad') and hasattr(__tokenizer, 'tokenizer'):
                if isinstance(data_collator, DataCollatorForSeq2Seq):
                    data_collator = DataCollatorForSeq2Seq(
                        __tokenizer.tokenizer,
                        pad_to_multiple_of = getattr(args, 'pad_to_multiple_of', None),
                    )
                else:
                    data_collator = TransformersDataCollatorForLanguageModeling(
                        __tokenizer.tokenizer,
                        mlm = False,
                        mlm_probability = 0.0,
                        pad_to_multiple_of = getattr(args, 'pad_to_multiple_of', None),
                    )
        other_metrics = []
        
        from unsloth_zoo.logging_utils import PatchRLStatistics
        PatchRLStatistics('kto_trainer', other_metrics)
        
        # [TODO] Fix up DataParallel multiplying batch sizes
        # [TODO] DDP works, but DP seems to not work? [TODO]
        if getattr(args, "parallel_mode", None) == ParallelMode.NOT_DISTRIBUTED and args.n_gpu > 1:
            if getattr(args, "_n_gpu", 1) != 1:
                args._n_gpu = 1
        if "model" in locals() and hasattr(model, "for_training"):
            model.for_training(use_gradient_checkpointing=getattr(args, 'gradient_checkpointing', True))
        super().__init__(
            model = model,
            ref_model = ref_model,
            args = args,
            train_dataset = train_dataset,
            eval_dataset = eval_dataset,
            processing_class = processing_class,
            data_collator = data_collator,
            model_init = model_init,
            callbacks = callbacks,
            preprocess_logits_for_metrics = preprocess_logits_for_metrics,
            peft_config = peft_config,
            compute_metrics = compute_metrics,
            model_adapter_name = model_adapter_name,
            ref_adapter_name = ref_adapter_name,**kwargs)
        if "model" in locals() and hasattr(model, "for_inference"):
            model.for_inference()
        if hasattr(self, 'neftune_hook_handle'):
            self.neftune_hook_handle.remove()
            if hasattr(self, 'neftune_hook_handle'): del self.neftune_hook_handle
        if getattr(args, 'neftune_noise_alpha', None) is not None:
            model.get_input_embeddings().neftune_noise_alpha = self.neftune_noise_alpha
        pass
        if hasattr(self, 'accelerator'):
            scaler = self.accelerator.scaler
            current_model = model
            while hasattr(current_model, 'model'):
                current_model.accelerator_scaler = scaler
                current_model = current_model.model
            current_model.accelerator_scaler = scaler
        pass
        if hasattr(self, 'train'):
            self.train = MethodType(prepare_for_training_mode(self.__class__.train), self)
        pass
        if hasattr(self, 'llm') and self.llm is not None and hasattr(self.llm, 'get_tokenizer'):
            _vllm_tok = self.llm.get_tokenizer()
            _pc = getattr(self, 'processing_class', None) or getattr(self, 'tokenizer', None)
            if _vllm_tok is not None and _pc is not None and getattr(_pc, 'chat_template', None) is not None and getattr(_vllm_tok, 'chat_template', None) is None:
                _vllm_tok.chat_template = _pc.chat_template
        pass
        
pass


if hasattr(logger, "addFilter"):
    import logging
    class HideLoggingMessage(logging.Filter):
        def __init__(self, text): self.text = text
        def filter(self, x): return not (self.text in x.getMessage())
    pass
    logger.addFilter(HideLoggingMessage("`use_cache=True`"))

