Update libs/labelbox/src/labelbox/schema/ontology_kind.py

Co-authored-by: Val Brodsky <vbrodsky@users.noreply.github.com>

Author: Gabefire

libs/labelbox/src/labelbox/schema/ontology_kind.py

@@ -24,7 +24,7 @@ def get_ontology_kind_validation_error(cls, ontology_kind):
 
     @staticmethod
     def evaluate_ontology_kind_with_media_type(ontology_kind,
-                                               media_type: Union[MediaType, None]) -> Union[MediaType, None]:
+                                               media_type: Optional[MediaType]) -> Union[MediaType, None]:
 
         if ontology_kind and ontology_kind is OntologyKind.ModelEvaluation:
             if media_type is None: