Try compatibility with Python 3.7

great_ai/models/use_model.py

@@ -1,19 +1,8 @@
 from functools import wraps
-from typing import (
-    Any,
-    Callable,
-    Dict,
-    List,
-    Literal,
-    Optional,
-    Set,
-    Tuple,
-    TypeVar,
-    Union,
-    cast,
-)
+from typing import Any, Callable, Dict, List, Optional, Set, Tuple, TypeVar, Union, cast
 
 from dill import load
+from typing_extensions import Literal  # <= Python 3.7
 
 from ..context import get_context
 from ..helper import get_function_metadata_store