1 files changed, 0 insertions, 158 deletions
diff --git a/src/text_recognizer/networks/cnn_transformer.py b/src/text_recognizer/networks/cnn_transformer.py
deleted file mode 100644
index a2d7926..0000000
--- a/src/text_recognizer/networks/cnn_transformer.py
+++ /dev/null
@@ -1,158 +0,0 @@
-"""A CNN-Transformer for image to text recognition."""
-from typing import Dict, Optional, Tuple
-
-from einops import rearrange, repeat
-import torch
-from torch import nn
-from torch import Tensor
-
-from text_recognizer.networks.transformer import PositionalEncoding, Transformer
-from text_recognizer.networks.util import activation_function
-from text_recognizer.networks.util import configure_backbone
-
-
-class CNNTransformer(nn.Module):
-    """CNN+Transfomer for image to sequence prediction."""
-
-    def __init__(
-        self,
-        num_encoder_layers: int,
-        num_decoder_layers: int,
-        hidden_dim: int,
-        vocab_size: int,
-        num_heads: int,
-        adaptive_pool_dim: Tuple,
-        expansion_dim: int,
-        dropout_rate: float,
-        trg_pad_index: int,
-        max_len: int,
-        backbone: str,
-        backbone_args: Optional[Dict] = None,
-        activation: str = "gelu",
-        pool_kernel: Optional[Tuple[int, int]] = None,
-    ) -> None:
-        super().__init__()
-        self.trg_pad_index = trg_pad_index
-        self.vocab_size = vocab_size
-        self.backbone = configure_backbone(backbone, backbone_args)
-
-        if pool_kernel is not None:
-            self.max_pool = nn.MaxPool2d(pool_kernel, stride=2)
-        else:
-            self.max_pool = None
-
-        self.character_embedding = nn.Embedding(self.vocab_size, hidden_dim)
-
-        self.src_position_embedding = nn.Parameter(torch.randn(1, max_len, hidden_dim))
-        self.pos_dropout = nn.Dropout(p=dropout_rate)
-        self.trg_position_encoding = PositionalEncoding(hidden_dim, dropout_rate)
-
-        nn.init.normal_(self.character_embedding.weight, std=0.02)
-
-        self.adaptive_pool = (
-            nn.AdaptiveAvgPool2d((adaptive_pool_dim)) if adaptive_pool_dim else None
-        )
-
-        self.transformer = Transformer(
-            num_encoder_layers,
-            num_decoder_layers,
-            hidden_dim,
-            num_heads,
-            expansion_dim,
-            dropout_rate,
-            activation,
-        )
-
-        self.head = nn.Sequential(
-            # nn.Linear(hidden_dim, hidden_dim * 2),
-            # activation_function(activation),
-            nn.Linear(hidden_dim, vocab_size),
-        )
-
-    def _create_trg_mask(self, trg: Tensor) -> Tensor:
-        # Move this outside the transformer.
-        trg_pad_mask = (trg != self.trg_pad_index)[:, None, None]
-        trg_len = trg.shape[1]
-        trg_sub_mask = torch.tril(
-            torch.ones((trg_len, trg_len), device=trg.device)
-        ).bool()
-        trg_mask = trg_pad_mask & trg_sub_mask
-        return trg_mask
-
-    def encoder(self, src: Tensor) -> Tensor:
-        """Forward pass with the encoder of the transformer."""
-        return self.transformer.encoder(src)
-
-    def decoder(self, trg: Tensor, memory: Tensor, trg_mask: Tensor) -> Tensor:
-        """Forward pass with the decoder of the transformer + classification head."""
-        return self.head(
-            self.transformer.decoder(trg=trg, memory=memory, trg_mask=trg_mask)
-        )
-
-    def extract_image_features(self, src: Tensor) -> Tensor:
-        """Extracts image features with a backbone neural network.
-
-        It seem like the winning idea was to swap channels and width dimension and collapse
-        the height dimension. The transformer is learning like a baby with this implementation!!! :D
-        Ohhhh, the joy I am experiencing right now!! Bring in the beers! :D :D :D
-
-        Args:
-            src (Tensor): Input tensor.
-
-        Returns:
-            Tensor: A input src to the transformer.
-
-        """
-        # If batch dimension is missing, it needs to be added.
-        if len(src.shape) < 4:
-            src = src[(None,) * (4 - len(src.shape))]
-
-        src = self.backbone(src)
-
-        if self.max_pool is not None:
-            src = self.max_pool(src)
-
-        if self.adaptive_pool is not None and len(src.shape) == 4:
-            src = rearrange(src, "b c h w -> b w c h")
-            src = self.adaptive_pool(src)
-            src = src.squeeze(3)
-        elif len(src.shape) == 4:
-            src = rearrange(src, "b c h w -> b (h w) c")
-
-        b, t, _ = src.shape
-
-        src += self.src_position_embedding[:, :t]
-        src = self.pos_dropout(src)
-
-        return src
-
-    def target_embedding(self, trg: Tensor) -> Tuple[Tensor, Tensor]:
-        """Encodes target tensor with embedding and postion.
-
-        Args:
-            trg (Tensor): Target tensor.
-
-        Returns:
-            Tuple[Tensor, Tensor]: Encoded target tensor and target mask.
-
-        """
-        trg = self.character_embedding(trg.long())
-        trg = self.trg_position_encoding(trg)
-        return trg
-
-    def decode_image_features(
-        self, image_features: Tensor, trg: Optional[Tensor] = None
-    ) -> Tensor:
-        """Takes images features from the backbone and decodes them with the transformer."""
-        trg_mask = self._create_trg_mask(trg)
-        trg = self.target_embedding(trg)
-        out = self.transformer(image_features, trg, trg_mask=trg_mask)
-
-        logits = self.head(out)
-        return logits
-
-    def forward(self, x: Tensor, trg: Optional[Tensor] = None) -> Tensor:
-        """Forward pass with CNN transfomer."""
-        image_features = self.extract_image_features(x)
-        logits = self.decode_image_features(image_features, trg)
-        return logits