Exclude words from GPT-2 generate( )

Hello!

I seems that this functionality is supported using the bad_words_ids input to the generate API. The docs briefly describe that you need to find a list of integers for the words you care about using the tokenizer and then simply pass those to generate:

**bad_words_ids** ( `List[List[int]]` , optional) – List of token ids that are not allowed to be generated. In order to get the tokens of the words that should not appear in the generated text, use `tokenizer(bad_word, add_prefix_space=True).input_ids` .

I hope this helps!
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