【fix】ops gatingtopk fix nightly ci error

[1092626063]

What this PR does / why we need it?

ops gatingtopk fix nightly ci error

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.11.0
• vLLM main: vllm-project/vllm@2918c1b

[gemini-code-assist]

Code Review

This pull request fixes a potential TypeError in _select_experts_with_fusion_ops by providing default values for topk_group and num_expert_group. My review focuses on a subtle change in behavior this introduces. While the fix is correct for the bug, it alters how softmax scoring handles expert grouping. I've left a comment with a suggestion to preserve the original behavior if the change was unintentional.

[gemini-code-assist]

This change correctly provides default values for topk_group and num_expert_group, fixing a potential TypeError. However, it also alters the behavior for scoring_func="softmax". The original code always disabled grouping for softmax by forcing topk_group=1 and num_expert_group=1. This change enables grouping for softmax if grouping parameters are provided.

If this was unintentional, the suggested change below preserves the original behavior for softmax while still fixing the bug for other cases. If enabling grouping for softmax was intended, feel free to disregard this suggestion.

    if scoring_func == "softmax":
        norm_type = 0
        topk_group = 1
        num_expert_group = 1
    else:
        norm_type = 1
        topk_group = topk_group if topk_group is not None else 1
        num_expert_group = num_expert_group if num_expert_group is not None else 1

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