放弃 LSTM ？

http://tech.ifeng.com/a/20180829/45143909_0.shtml

https://arxiv.org/abs/1808.03867

https://arxiv.org/abs/1803.01271

https://towardsdatascience.com/the-fall-of-rnn-lstm-2d1594c74ce0

https://www.quora.com/Is-it-possible-to-train-a-RNN-on-a-single-extremely-long-sequence

https://arxiv.org/abs/1803.04831

https://deepmind.com/blog/wavenet-generative-model-raw-audio/