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"""Configuration definitions for EfficientNet losses, learning rates, and optimizers."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import dataclasses
from official.legacy.image_classification.configs import base_configs
from official.modeling.hyperparams import base_config


@dataclasses.dataclass
class EfficientNetModelConfig(base_configs.ModelConfig):
  """Configuration for the EfficientNet model.

  This configuration will default to settings used for training efficientnet-b0
  on a v3-8 TPU on ImageNet.

  Attributes:
    name: The name of the model. Defaults to 'EfficientNet'.
    num_classes: The number of classes in the model.
    model_params: A dictionary that represents the parameters of the
      EfficientNet model. These will be passed in to the "from_name" function.
    loss: The configuration for loss. Defaults to a categorical cross entropy
      implementation.
    optimizer: The configuration for optimizations. Defaults to an RMSProp
      configuration.
    learning_rate: The configuration for learning rate. Defaults to an
      exponential configuration.
  """
  name: str = 'EfficientNet'
  num_classes: int = 1000
  model_params: base_config.Config = dataclasses.field(
      default_factory=lambda: {
          'model_name': 'efficientnet-b0',
          'model_weights_path': '',
          'weights_format': 'saved_model',
          'overrides': {
              'batch_norm': 'default',
              'rescale_input': True,
              'num_classes': 1000,
              'activation': 'swish',
              'dtype': 'float32',
          }
      })
  loss: base_configs.LossConfig = dataclasses.field(
      default_factory=lambda: base_configs.LossConfig(  # pylint: disable=g-long-lambda
          name='categorical_crossentropy', label_smoothing=0.1
      )
  )
  optimizer: base_configs.OptimizerConfig = dataclasses.field(
      default_factory=lambda: base_configs.OptimizerConfig(  # pylint: disable=g-long-lambda
          name='rmsprop',
          decay=0.9,
          epsilon=0.001,
          momentum=0.9,
          moving_average_decay=None,
      )
  )
  learning_rate: base_configs.LearningRateConfig = dataclasses.field(
      default_factory=lambda: base_configs.LearningRateConfig(  # pylint: disable=g-long-lambda
          name='exponential',
          initial_lr=0.008,
          decay_epochs=2.4,
          decay_rate=0.97,
          warmup_epochs=5,
          scale_by_batch_size=1.0 / 128.0,
          staircase=True,
      )
  )
