def METHOD_NAME(yaml_string, custom_objects=None):
    """Parses a yaml model configuration file and returns a model instance.
    Note: Since TF 2.6, this method is no longer supported and will raise a
    RuntimeError.
    Args:
        yaml_string: YAML string or open file encoding a model configuration.
        custom_objects: Optional dictionary mapping names
            (strings) to custom classes or functions to be
            considered during deserialization.
    Returns:
        A Keras model instance (uncompiled).
    Raises:
        RuntimeError: announces that the method poses a security risk
    """
    raise RuntimeError(
        "Method `model_from_yaml()` has been removed due to security risk of "
        "arbitrary code execution. Please use `Model.to_json()` and "
        "`model_from_json()` instead."
    )