Fix RMSNorm monkey patch for Gemma models #1886
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Description
Gemma 1/2 use the different offset and dtype casting method comparing to that of LLaMA. Liger Kernel already updated these differences (linkedin/Liger-Kernel#85, linkedin/Liger-Kernel#92) in 0.2.1, but axolotl uses still buggy implementation. This PR fixes the bug.
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