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"""ELECTRA model configurations and instantiation methods."""
from typing import List

import dataclasses

from official.modeling.hyperparams import base_config
from official.nlp.configs import bert
from official.nlp.configs import encoders


@dataclasses.dataclass
class ElectraPretrainerConfig(base_config.Config):
  """ELECTRA pretrainer configuration."""
  num_masked_tokens: int = 76
  sequence_length: int = 512
  num_classes: int = 2
  discriminator_loss_weight: float = 50.0
  tie_embeddings: bool = True
  disallow_correct: bool = False
  generator_encoder: encoders.EncoderConfig = dataclasses.field(
      default_factory=encoders.EncoderConfig
  )
  discriminator_encoder: encoders.EncoderConfig = dataclasses.field(
      default_factory=encoders.EncoderConfig
  )
  cls_heads: List[bert.ClsHeadConfig] = dataclasses.field(default_factory=list)
