Tensorflow踩坑之tf.nn.bidirectional_dynamic_rnn（）報錯 “ValueError: None values not supported.”

**詳細解決方法見鏈接：https://stackoverflow.com/questions/39808336/tensorflow-bidirectional-dynamic-rnn-none-values-error **
主要原因：tf.nn.bidirectional_dynamic_rnn（）中的參數sequence_length必須設置
tf.nn.bidirectional_dynamic_rnn（）函數詳情鏈接：https://tensorflow.google.cn/api_docs/python/tf/nn/bidirectional_dynamic_rnn