Error when running

[vanzytay]

Hi, I ran the code following the readme and ran into this error.

Traceback (most recent call last):
File "train.py", line 7, in
from seq2seq import train_encoder_decoder
File "/Users/username/seq2seq/seq2seq.py", line 21
dictionary: corpora.Dictionary,
^
SyntaxError: invalid syntax

May I know how to fix it?

Thanks!