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# Licensed under the Apache License, Version 2.0 (the "License");
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"""Decoders configurations."""
import dataclasses
from typing import Optional, Sequence

from official.modeling import hyperparams


@dataclasses.dataclass
class Identity(hyperparams.Config):
  """Identity config."""
  pass


@dataclasses.dataclass
class UNet3DDecoder(hyperparams.Config):
  """UNet3D decoder config."""
  model_id: int = 4
  pool_size: Sequence[int] = (2, 2, 2)
  kernel_size: Sequence[int] = (3, 3, 3)
  use_batch_normalization: bool = True
  use_deconvolution: bool = True


@dataclasses.dataclass
class Decoder(hyperparams.OneOfConfig):
  """Configuration for decoders.

  Attributes:
    type: 'str', type of decoder be used, on the of fields below.
    identity: identity decoder config.
    unet_3d_decoder: UNet3D decoder config.
  """
  type: Optional[str] = None
  identity: Identity = dataclasses.field(default_factory=Identity)
  unet_3d_decoder: UNet3DDecoder = dataclasses.field(
      default_factory=UNet3DDecoder
  )
