def get_child_index_list(graph, label_list):
    """
        Return child node index in label_list.

    """
    child_index = []
    for label in label_list:
        tmp = []
        for child in graph.predecessors(label):
            try:
                tmp.append(label_list.index(child))
            except ValueError:
                pass
        child_index.append(tmp)
    return child_index
