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Update utils.py

Fix the condition error of the FP8 attention in `get_attention_backend`
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Reset FP8 weight workspace if usages are invalid
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* optimize kv_cache reindex and copy kernels
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* avoid reindexing from python side
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* rename variable from previous commit
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* minor fix
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* minor fix
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* save original input
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* fix input_quantizer usage in Linear bwd
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* minor fix
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* refine the docstring
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* Merge remote-tracking branch 'origin/main' into save_bf16_in_fp8_gemm
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* decouple linear bwd with save_original_input; clean up UTs
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* mxfp8 is not supported on 120+ arch yet
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* fix
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* float8currentscaling quantizer exception
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* Fix clearing tensor data in backward removing is_first_op
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