1 files changed, 21 insertions, 0 deletions
diff --git a/text_recognizer/network/convnext/downsample.py b/text_recognizer/network/convnext/downsample.py
new file mode 100644
index 0000000..a8a0466
--- /dev/null
+++ b/text_recognizer/network/convnext/downsample.py
@@ -0,0 +1,21 @@
+"""Convnext downsample module."""
+from typing import Tuple
+
+from einops.layers.torch import Rearrange
+from torch import Tensor, nn
+
+
+class Downsample(nn.Module):
+    """Downsamples feature maps by patches."""
+
+    def __init__(self, dim: int, dim_out: int, factors: Tuple[int, int]) -> None:
+        super().__init__()
+        s1, s2 = factors
+        self.fn = nn.Sequential(
+            Rearrange("b c (h s1) (w s2) -> b (c s1 s2) h w", s1=s1, s2=s2),
+            nn.Conv2d(dim * s1 * s2, dim_out, 1),
+        )
+
+    def forward(self, x: Tensor) -> Tensor:
+        """Applies patch function."""
+        return self.fn(x)