torch.cuda.OutOfMemoryError is not present on older pytorch versions.

comfy/ldm/modules/sub_quadratic_attention.py

@@ -19,6 +19,11 @@ from typing import Optional, NamedTuple, Protocol, List
 from torch import Tensor
 from typing import List
 
+try:
+    OOM_EXCEPTION = torch.cuda.OutOfMemoryError
+except:
+    OOM_EXCEPTION = Exception
+
 def dynamic_slice(
     x: Tensor,
     starts: List[int],
@@ -151,7 +156,7 @@ def _get_attention_scores_no_kv_chunking(
     try:
         attn_probs = attn_scores.softmax(dim=-1)
         del attn_scores
-    except torch.cuda.OutOfMemoryError:
+    except OOM_EXCEPTION:
         print("ran out of memory while running softmax in  _get_attention_scores_no_kv_chunking, trying slower in place softmax instead")
         torch.exp(attn_scores, out=attn_scores)
         summed = torch.sum(attn_scores, dim=-1, keepdim=True)