[superglue] fix wrong concatenation which made batching results wrong (#38850)

Author: sbucaille

src/transformers/models/superglue/modeling_superglue.py

@@ -725,8 +725,8 @@ def _match_image_pair(
         matches0 = torch.where(valid0, indices0, indices0.new_tensor(-1))
         matches1 = torch.where(valid1, indices1, indices1.new_tensor(-1))
 
-        matches = torch.cat([matches0, matches1]).reshape(batch_size, 2, -1)
-        matching_scores = torch.cat([matching_scores0, matching_scores1]).reshape(batch_size, 2, -1)
+        matches = torch.cat([matches0, matches1], dim=1).reshape(batch_size, 2, -1)
+        matching_scores = torch.cat([matching_scores0, matching_scores1], dim=1).reshape(batch_size, 2, -1)
 
         if output_hidden_states:
             all_hidden_states = all_hidden_states + encoded_keypoints[1]