An issue about the implement of train_scpn.py forward function

[shuangqinbuaa]

The line 241 in train_scpn.py: copy_probs = copy_probs.view(-1); I think it should be: copy_probs = copy_probs.transpose(0, 1).contiguous().view(-1) because decoder_states, decoder_copy_dists are transposed: line 234: decoder_states = decoder_states.transpose(0, 1).contiguous().view(-1, self.d_hid * 2) line 238: decoder_copy_dists = decoder_copy_dists.transpose(0, 1).contiguous().view(-1, self.len_voc) @miyyer @jwieting