Default to old checkpoint format for now, still want compatibility with older torch ver for released models

avg_checkpoints.py

@@ -103,7 +103,11 @@ def main():
         v = v.clamp(float32_info.min, float32_info.max)
         final_state_dict[k] = v.to(dtype=torch.float32)
 
+    try:
+        torch.save(final_state_dict, args.output, _use_new_zipfile_serialization=False)
+    except:
         torch.save(final_state_dict, args.output)
+
     with open(args.output, 'rb') as f:
         sha_hash = hashlib.sha256(f.read()).hexdigest()
     print("=> Saved state_dict to '{}, SHA256: {}'".format(args.output, sha_hash))

clean_checkpoint.py

@@ -57,7 +57,11 @@ def main():
             new_state_dict[name] = v
         print("=> Loaded state_dict from '{}'".format(args.checkpoint))
 
+        try:
+            torch.save(new_state_dict, _TEMP_NAME, _use_new_zipfile_serialization=False)
+        except:
             torch.save(new_state_dict, _TEMP_NAME)
+
         with open(_TEMP_NAME, 'rb') as f:
             sha_hash = hashlib.sha256(f.read()).hexdigest()