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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.

fix run_gpt2.py

Update README.md