asr_lstm_ctc.py 文件源码

def sparse_tuple_from(sequences, dtype=np.int32):
    """????list????????????????tensorflow?tf.sparse_placeholder????
    Args:
        sequences: ?????
    Returns:
        ???????tensorflow?tf.sparse_placeholder???
    """
    indices = []
    values = []

    for n, seq in enumerate(sequences):
        indices.extend(zip([n]*len(seq), range(len(seq))))
        values.extend(seq)

    indices = np.asarray(indices, dtype=np.int64)
    values = np.asarray(values, dtype=dtype)
    shape = np.asarray([len(sequences), np.asarray(indices).max(0)[1]+1], dtype=np.int64)

    return indices, values, shape