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Fix #1015 (tokenizer defaults to use_lower_case=True when loading from trained models)

Fix a path so that a test can run on Windows

Fix typo. configuratoin -> configuration

Fix bug of multi-gpu training in lm finetuning

Swap of optimizer.step and scheduler.step for lm finetuning examples

This reverts commit a1359b97.

fix issue #824

This reverts commit 00e9c4cc.

RoBERTa: model conversion, inference, tests 🔥

cf. https://github.com/huggingface/pytorch-transformers/pull/964#discussion_r313574354

Co-Authored-By: Myle Ott <myleott@fb.com>