keras/src/saving/object_registration.py/get_custom_objects
def get_custom_objects():
    """Retrieves a live reference to the global dictionary of custom objects.

    Custom objects set using `custom_object_scope()` are not added to the
    global dictionary of custom objects, and will not appear in the returned
    dictionary.

    Example:

    ```python
    get_custom_objects().clear()
    get_custom_objects()['MyObject'] = MyObject
    ```

    Returns:
        Global dictionary mapping registered class names to classes.
    """
    return GLOBAL_CUSTOM_OBJECTS