Cherry-pick upstream hash top-k dtype fix#19
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Align hash routing metadata to the topk index dtype before invoking the sqrt-softplus topk custom op. DeepEP may request int64 topk indices while DeepSeek V4 hash MoE metadata remains int32, but the CUDA op dispatches hash metadata from the topk index dtype. Co-authored-by: Trae AI <trae-ai@users.noreply.github.com> Signed-off-by: wangyicong <wangyicong@bytedance.com> (cherry picked from commit 01e7beb)
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Base: main (upstream vLLM v0.22.1)
This replaces our local DeepSeek V4 router/model dtype workaround with a cherry-pick of upstream vLLM PR vllm-project#43425:
vllm-project#43425
The upstream fix aligns DeepSeek V4 hash-routing metadata to topk_indices.dtype inside vllm._custom_ops.topk_hash_softplus_sqrt before invoking the sqrt-softplus top-k custom op. This is narrower than our previous workaround: it no longer forces model hash_indices_dtype or patches fused_topk_bias_router.py.
Related upstream issues:
Validation:
Runtime validation on Isambard is still pending.