From dc28cbe2b4ed77be92ee8b2b69a20689c3bf02a4 Mon Sep 17 00:00:00 2001
From: aktersnurra <gustaf.rydholm@gmail.com>
Date: Sun, 8 Nov 2020 14:54:44 +0100
Subject: new updates

---
 src/text_recognizer/networks/sparse_mlp.py | 78 ++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/text_recognizer/networks/sparse_mlp.py

(limited to 'src/text_recognizer/networks/sparse_mlp.py')

diff --git a/src/text_recognizer/networks/sparse_mlp.py b/src/text_recognizer/networks/sparse_mlp.py
new file mode 100644
index 0000000..53cf166
--- /dev/null
+++ b/src/text_recognizer/networks/sparse_mlp.py
@@ -0,0 +1,78 @@
+"""Defines the Sparse MLP network."""
+from typing import Callable, Dict, List, Optional, Union
+import warnings
+
+from einops.layers.torch import Rearrange
+from pytorch_block_sparse import BlockSparseLinear
+import torch
+from torch import nn
+
+from text_recognizer.networks.util import activation_function
+
+warnings.filterwarnings("ignore", category=DeprecationWarning)
+
+
+class SparseMLP(nn.Module):
+    """Sparse multi layered perceptron network."""
+
+    def __init__(
+        self,
+        input_size: int = 784,
+        num_classes: int = 10,
+        hidden_size: Union[int, List] = 128,
+        num_layers: int = 3,
+        density: float = 0.1,
+        activation_fn: str = "relu",
+    ) -> None:
+        """Initialization of the MLP network.
+
+        Args:
+            input_size (int): The input shape of the network. Defaults to 784.
+            num_classes (int): Number of classes in the dataset. Defaults to 10.
+            hidden_size (Union[int, List]): The number of `neurons` in each hidden layer. Defaults to 128.
+            num_layers (int): The number of hidden layers. Defaults to 3.
+            density (float): The density of activation at each layer. Default to 0.1.
+            activation_fn (str): Name of the activation function in the hidden layers. Defaults to
+                relu.
+
+        """
+        super().__init__()
+
+        activation_fn = activation_function(activation_fn)
+
+        if isinstance(hidden_size, int):
+            hidden_size = [hidden_size] * num_layers
+
+        self.layers = [
+            Rearrange("b c h w -> b (c h w)"),
+            nn.Linear(in_features=input_size, out_features=hidden_size[0]),
+            activation_fn,
+        ]
+
+        for i in range(num_layers - 1):
+            self.layers += [
+                BlockSparseLinear(
+                    in_features=hidden_size[i],
+                    out_features=hidden_size[i + 1],
+                    density=density,
+                ),
+                activation_fn,
+            ]
+
+        self.layers.append(
+            nn.Linear(in_features=hidden_size[-1], out_features=num_classes)
+        )
+
+        self.layers = nn.Sequential(*self.layers)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        """The feedforward pass."""
+        # If batch dimenstion is missing, it needs to be added.
+        if len(x.shape) < 4:
+            x = x[(None,) * (4 - len(x.shape))]
+        return self.layers(x)
+
+    @property
+    def __name__(self) -> str:
+        """Returns the name of the network."""
+        return "mlp"
-- 
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