How to create vocab.txt for run_mlm.py
hi, I am training a model from scratch. (I set "--train_file ./train_uncased.txt") 

I run script run_mlm.py with argument "--tokenizer_name bert-base-chinese" 

However, I can not find some words (which is in train_uncased.txt) in the file vocab.txt.

could someone tell me how to  create a vocab.txt 

Thanks