Revert "feat: update grouped_topk to support softmax and sigmoid" #4505
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Reverts #3680
Related to issue #4497.
Currently
grouped_topk
is only used for DeepSeek-V2/V2.5,biased_grouped_topk
is used for DeepSeek-V3/R1. For DeepSeek-V2, the scoring function is alwayssoftmax
, so don't need to add new option.