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Fix indentation for unconditional generation

Fix gradient overflow issue during attention mask

[run_gpt2.py] temperature should be a float, not int

Gpt2 tokenization

This fix is in reference to issue #382. GPT2 can now be trained in mixed precision, which I've confirmed with testing. I also tested unconditional generation on multiple seeds before and after changing 1e10 to 1e4 and there was no difference. Please let me know if there is anything else I can do to make this pull request better. Thanks for all your work!

Better serialization for Tokenizers and Configuration classes - Also fix #466

Clean up GPT and GPT-2 losses computation

making unconditional generation work

Extend the BertForSequenceClassification docs to mention the special CLS token.

Fix tsv read error in Windows

Added a helpful error for users with single-document corpuses - fixes # 452

error for users whose corpus is just one giant document.