def METHOD_NAME(segments_file):
    ret = {}
    if not os.path.exists(segments_file):
        return None
    for line in open(segments_file):
        utt, rec, st, et = line.strip().split()
        if rec not in ret:
            ret[rec] = []
        ret[rec].append({'utt':utt, 'st':float(st), 'et':float(et)})
    return ret