Index misplacement of Vocab.txt BUG BUG BUG
## 🐛 Bug

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Model I am using (BertTokenizer):

Language I am using the model on (Chinese):

The problem arise when using:

**pytorch tokenizer**
```
t = tokenizer.tokenize('[CLS]哦我[SEP]')
i = tokenizer.convert_tokens_to_ids(t)
print(i)
[101, 1522, 2770, 102]
```

**tensorflow tokenizer**
```
t = tokenizer.tokenize('[CLS]哦我[SEP]')
i = tokenizer.convert_tokens_to_ids(t)
print(i)
[101, 1521, 2769, 102]
```

> Due to index misalignment, When the last word （##😎）in the  Vocab.txt  appears in the training set ，out of range error.