def METHOD_NAME(expr):
    """Search name of weight in all ```nn.dense``` operator
       This is a helpful function to determine which param need
       to be converted to sparse
    Parameters
    ----------
    expr : relay.Expr
        Expr will be searched
    Returns
    -------
    ret : Array[String]
        name of weight in all ``nn.dense``` operator
    """
    return _ffi_api.search_dense_op_weight(expr)