diff --git a/models.py b/models.py
index 04795de..c2fb1c9 100644
--- a/models.py
+++ b/models.py
@@ -946,7 +946,6 @@ class PoolFormerBlock(nn.Module):
         self.window_size = window_size
         self.shift_size = shift_size
         self.input_resolution = input_resolution
-        self.attn_mask = None
         self.token_mixer = WindowAttention(dim=dim, window_size=to_2tuple(self.window_size), num_heads=num_heads, attn_drop=0.1, proj_drop=0.2)
         self.norm2 = norm_layer(dim)
         mlp_hidden_dim = int(dim * mlp_ratio)