Add convnext module

1 files changed, 15 insertions, 0 deletions

diff --git a/text_recognizer/networks/convnext/norm.py b/text_recognizer/networks/convnext/norm.py
new file mode 100644
index 0000000..2d896e5
--- /dev/null
+++ b/text_recognizer/networks/convnext/norm.py
@@ -0,0 +1,15 @@
+"""Layer norm for conv layers."""
+import torch
+from torch import nn, Tensor
+
+
+class LayerNorm(nn.Module):
+    def __init__(self, dim: int) -> None:
+        super().__init__()
+        self.gamma = nn.Parameter(torch.ones(1, dim, 1, 1))
+
+    def forward(self, x: Tensor) -> Tensor:
+        eps = 1e-5 if x.dtype == torch.float32 else 1e-3
+        var = torch.var(x, dim=1, unbiased=False, keepdim=True)
+        mean = torch.mean(x, dim=1, keepdim=True)
+        return (x - mean) / (var + eps).sqrt() * self.gamma