Delete index information from params

    Parameters
    ----------
    params : dict

    Returns
    -------
    result : dict

def _split_index(params):
    """Delete index information from params

    Parameters
    ----------
    params : dict

    Returns
    -------
    result : dict
    """
    result = {}
    for key in params:
        if isinstance(params[key], dict):
            value = params[key]['_value']
        else:
            value = params[key]
        result[key] = value
    return result