Tzu-Ray Su

Results 1 issues of Tzu-Ray Su

Once the bug in `pytorch` is fixed, I'll remove this line. The bug is described in [pytorch forum](https://discuss.pytorch.org/t/bug-of-nn-embedding-when-sparse-true-and-padding-idx-is-set/9382/2) and reported in [github]( https://github.com/pytorch/pytorch/issues/3506).