Yes, I use the padding. and I  use the pack_padded_sequence,
I then fed the output of  pack_padded sequence into LSTM, and I got the two output from
LSTM: output and hiddenstate. I want to use the hiddenstate for further processing. But I
am not very clear about the hiddenstate which are calculated by the packed sequence, I think
I sould desort the hiddenstate, and should I unpad it? Could anybody give me some light on
this?