def get_class_type(class_type):
    """Change class_type (string) to verb (bool) and noun (bool) for efficiency. Only noun is NA because we
    work on action recognition."""

    verb = True
    if class_type.lower() == "verb":
        noun = False
    elif class_type.lower() == "verb+noun":
        noun = True
    else:
        raise ValueError("Invalid class type option: {}".format(class_type))
    return verb, noun