add formatting for llama2chat #534
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This adds formatting classes for ChatML (MPT) and Llama2 chat. In
hf_chat.pywe automatically infer the formatting needed based on model name for these two formatting types.Why? This makes it a lot easier to test MPT-chat and llama2 chat models with our
hf_chat.pyscript. Also, these formatters can be useful for storing chat data in a syntaxless way (list of lists) and easily reformatting for ChatML or llama2 style chat finetuning. It also allows for easy translation from llama2 formatting to ChatML formatting.