update

Author: a-r-r-o-w

src/diffusers/models/attention_dispatch.py

@@ -179,7 +179,6 @@ def decorator(func):
 
     @classmethod
     def get_active_backend(cls):
-        _check_backend_requirements(cls._active_backend)
         return cls._active_backend, cls._backends[cls._active_backend]
 
     @classmethod
@@ -227,6 +226,8 @@ def dispatch_attention_fn(
         backend_name = AttentionBackendName(backend)
         backend_fn = _AttentionBackendRegistry._backends.get(backend_name)
 
+    _check_backend_requirements(backend_name)
+
     kwargs = {
         "query": query,
         "key": key,