get_vocab.py运行出错

您好，在运行get_vocab.py时报出错误
Traceback (most recent call last):
File "lib/get_vocab.py", line 89, in
get_vocab(train_file, dev_file)
File "lib/get_vocab.py", line 61, in get_vocab
raise ValueError('The length of dev word is 0')
ValueError: The length of dev word is 0
想请教一下这个该如何解决呢？

Start by reading lib/get_vocab.py around lines 61 and 89, then inspect the train and dev file arguments passed to get_vocab. Reproduce the command with the referenced data and determine why the dev vocabulary is empty; done means the script completes without this ValueError.

Written by the indexing model from the issue text.