def METHOD_NAME() -> io.BytesIO:
    """Returns the nmdc.yaml file as bytes steam.
    This function is not intended to be used directly, but it used by other functions
    Returns
    -------
    BytesIO
        A bytes stream of nmdc.yaml file.
    """
    # get nmdc.yaml file from the package data
    return io.BytesIO(pkgutil.get_data(__name__, "nmdc_schema_merged.yaml"))