1 files changed, 93 insertions, 0 deletions
diff --git a/src/text_recognizer/networks/lenet.py b/src/text_recognizer/networks/lenet.py
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+++ b/src/text_recognizer/networks/lenet.py
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+"""Defines the LeNet network."""
+from typing import Callable, Optional, Tuple
+
+import torch
+from torch import nn
+
+
+class Flatten(nn.Module):
+    """Flattens a tensor."""
+
+    def forward(self, x: int) -> torch.Tensor:
+        """Flattens a tensor for input to a nn.Linear layer."""
+        return torch.flatten(x, start_dim=1)
+
+
+class LeNet(nn.Module):
+    """LeNet network."""
+
+    def __init__(
+        self,
+        channels: Tuple[int, ...],
+        kernel_sizes: Tuple[int, ...],
+        hidden_size: Tuple[int, ...],
+        dropout_rate: float,
+        output_size: int,
+        activation_fn: Optional[Callable] = None,
+    ) -> None:
+        """The LeNet network.
+
+        Args:
+            channels (Tuple[int, ...]): Channels in the convolutional layers.
+            kernel_sizes (Tuple[int, ...]): Kernel sizes in the convolutional layers.
+            hidden_size (Tuple[int, ...]): Size of the flattend output form the convolutional layers.
+            dropout_rate (float): The dropout rate.
+            output_size (int): Number of classes.
+            activation_fn (Optional[Callable]): The non-linear activation function. Defaults to
+                nn.ReLU(inplace).
+
+        """
+        super().__init__()
+
+        if activation_fn is None:
+            activation_fn = nn.ReLU(inplace=True)
+
+        self.layers = [
+            nn.Conv2d(
+                in_channels=channels[0],
+                out_channels=channels[1],
+                kernel_size=kernel_sizes[0],
+            ),
+            activation_fn,
+            nn.Conv2d(
+                in_channels=channels[1],
+                out_channels=channels[2],
+                kernel_size=kernel_sizes[1],
+            ),
+            activation_fn,
+            nn.MaxPool2d(kernel_sizes[2]),
+            nn.Dropout(p=dropout_rate),
+            Flatten(),
+            nn.Linear(in_features=hidden_size[0], out_features=hidden_size[1]),
+            activation_fn,
+            nn.Dropout(p=dropout_rate),
+            nn.Linear(in_features=hidden_size[1], out_features=output_size),
+        ]
+
+        self.layers = nn.Sequential(*self.layers)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        """The feedforward."""
+        return self.layers(x)
+
+
+# def test():
+#     x = torch.randn([1, 1, 28, 28])
+#     channels = [1, 32, 64]
+#     kernel_sizes = [3, 3, 2]
+#     hidden_size = [9216, 128]
+#     output_size = 10
+#     dropout_rate = 0.2
+#     activation_fn = nn.ReLU()
+#     net = LeNet(
+#         channels=channels,
+#         kernel_sizes=kernel_sizes,
+#         dropout_rate=dropout_rate,
+#         hidden_size=hidden_size,
+#         output_size=output_size,
+#         activation_fn=activation_fn,
+#     )
+#     from torchsummary import summary
+#
+#     summary(net, (1, 28, 28), device="cpu")
+#     out = net(x)