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author | Gustaf Rydholm <gustaf.rydholm@gmail.com> | 2021-03-20 18:09:06 +0100 |
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committer | Gustaf Rydholm <gustaf.rydholm@gmail.com> | 2021-03-20 18:09:06 +0100 |
commit | 7e8e54e84c63171e748bbf09516fd517e6821ace (patch) | |
tree | 996093f75a5d488dddf7ea1f159ed343a561ef89 /src/text_recognizer/networks/vqvae/decoder.py | |
parent | b0719d84138b6bbe5f04a4982dfca673aea1a368 (diff) |
Inital commit for refactoring to lightning
Diffstat (limited to 'src/text_recognizer/networks/vqvae/decoder.py')
-rw-r--r-- | src/text_recognizer/networks/vqvae/decoder.py | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/src/text_recognizer/networks/vqvae/decoder.py b/src/text_recognizer/networks/vqvae/decoder.py deleted file mode 100644 index 8847aba..0000000 --- a/src/text_recognizer/networks/vqvae/decoder.py +++ /dev/null @@ -1,133 +0,0 @@ -"""CNN decoder for the VQ-VAE.""" - -from typing import List, Optional, Tuple, Type - -import torch -from torch import nn -from torch import Tensor - -from text_recognizer.networks.util import activation_function -from text_recognizer.networks.vqvae.encoder import _ResidualBlock - - -class Decoder(nn.Module): - """A CNN encoder network.""" - - def __init__( - self, - channels: List[int], - kernel_sizes: List[int], - strides: List[int], - num_residual_layers: int, - embedding_dim: int, - upsampling: Optional[List[List[int]]] = None, - activation: str = "leaky_relu", - dropout_rate: float = 0.0, - ) -> None: - super().__init__() - - if dropout_rate: - if activation == "selu": - dropout = nn.AlphaDropout(p=dropout_rate) - else: - dropout = nn.Dropout(p=dropout_rate) - else: - dropout = None - - self.upsampling = upsampling - - self.res_block = nn.ModuleList([]) - self.upsampling_block = nn.ModuleList([]) - - self.embedding_dim = embedding_dim - activation = activation_function(activation) - - # Configure encoder. - self.decoder = self._build_decoder( - channels, kernel_sizes, strides, num_residual_layers, activation, dropout, - ) - - def _build_decompression_block( - self, - in_channels: int, - channels: int, - kernel_sizes: List[int], - strides: List[int], - activation: Type[nn.Module], - dropout: Optional[Type[nn.Module]], - ) -> nn.ModuleList: - modules = nn.ModuleList([]) - configuration = zip(channels, kernel_sizes, strides) - for i, (out_channels, kernel_size, stride) in enumerate(configuration): - modules.append( - nn.Sequential( - nn.ConvTranspose2d( - in_channels, - out_channels, - kernel_size, - stride=stride, - padding=1, - ), - activation, - ) - ) - - if i < len(self.upsampling): - modules.append(nn.Upsample(size=self.upsampling[i]),) - - if dropout is not None: - modules.append(dropout) - - in_channels = out_channels - - modules.extend( - nn.Sequential( - nn.ConvTranspose2d( - in_channels, 1, kernel_size=kernel_size, stride=stride, padding=1 - ), - nn.Tanh(), - ) - ) - - return modules - - def _build_decoder( - self, - channels: int, - kernel_sizes: List[int], - strides: List[int], - num_residual_layers: int, - activation: Type[nn.Module], - dropout: Optional[Type[nn.Module]], - ) -> nn.Sequential: - - self.res_block.append( - nn.Conv2d(self.embedding_dim, channels[0], kernel_size=1, stride=1,) - ) - - # Bottleneck module. - self.res_block.extend( - nn.ModuleList( - [ - _ResidualBlock(channels[0], channels[0], dropout) - for i in range(num_residual_layers) - ] - ) - ) - - # Decompression module - self.upsampling_block.extend( - self._build_decompression_block( - channels[0], channels[1:], kernel_sizes, strides, activation, dropout - ) - ) - - self.res_block = nn.Sequential(*self.res_block) - self.upsampling_block = nn.Sequential(*self.upsampling_block) - - return nn.Sequential(self.res_block, self.upsampling_block) - - def forward(self, z_q: Tensor) -> Tensor: - """Reconstruct input from given codes.""" - x_reconstruction = self.decoder(z_q) - return x_reconstruction |