mask expansion

src/axolotl/monkeypatch/utils.py

@@ -229,7 +229,7 @@ def mask_2d_to_4d(
     tgt_len = tgt_len if tgt_len is not None else src_len
 
     # mask = mask.unsqueeze(1).unsqueeze(2)
-    mask = mask[:, None, :].expand(bsz, 1, tgt_len, src_len)
+    mask = mask[None, None, :, :].expand(bsz, 1, tgt_len, src_len)
 
     # Create a binary mask from the original mask where zeros remain zeros and all other values are set to one
     binary_mask = torch.where(