RMSNorm epsilon implementation #1342
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…MS. Matches huggingface transformers
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Make RMSNorm implementation match the huggingface transformers one. epsilon now adds to the variance rather than adding to the RMS. This fixes compatibility with Llama but could break compatibility with any models using RMSNorm and trained with previous versions of GPT-NeoX.
See #1337 for more info.