Duplicate Initialization during Training Process

[theodore3131]

During executing the demo training step in the README, I found these two statements every epoch, I suppose there may be some unneeded code in the train.py

Table trying to initialize from file ../data/monument_300_model/vocab.en is already initialized.
Table trying to initialize from file ../data/monument_300_model/vocab.en is already initialized.

Trying to solve it.