allow attention processors to have different signatures (#6915)

add
Co-authored-by: yiyixuxu <yixu310@gmail,com>

src/diffusers/models/attention_processor.py

@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import inspect
 from importlib import import_module
 from typing import Callable, Optional, Union
 
@@ -509,6 +510,15 @@ class Attention(nn.Module):
         # The `Attention` class can call different attention processors / attention functions
         # here we simply pass along all tensors to the selected processor class
         # For standard processors that are defined here, `**cross_attention_kwargs` is empty
+
+        attn_parameters = set(inspect.signature(self.processor.__call__).parameters.keys())
+        unused_kwargs = [k for k, _ in cross_attention_kwargs.items() if k not in attn_parameters]
+        if len(unused_kwargs) > 0:
+            logger.warning(
+                f"cross_attention_kwargs {unused_kwargs} are not expected by {self.processor.__class__.__name__} and will be ignored."
+            )
+        cross_attention_kwargs = {k: w for k, w in cross_attention_kwargs.items() if k in attn_parameters}
+
         return self.processor(
             self,
             hidden_states,