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[XPU] Ensure RNG offset alignment with PyTorch requirements in XPU sampler #43028

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Merged
jikunshang merged 3 commits into from
May 26, 2026
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[XPU] Ensure RNG offset alignment with PyTorch requirements in XPU sampler #43028

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205c32a
Ensure RNG offset alignment with PyTorch requirement (multiple of 4) …
chaojun-zhang May 18, 2026
59e8849
Update vllm/v1/sample/ops/topk_topp_sampler.py
chaojun-zhang May 19, 2026
94738a1
Merge branch 'main' into test_regression_fix
mergify[bot] May 25, 2026
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3 changes: 2 additions & 1 deletion vllm/v1/sample/ops/topk_topp_sampler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -291,7 +291,8 @@ def forward_xpu(
)
# The custom XPU sampler kernel consumes RNG values internally, so advance
# the default generator's offset to keep future draws deterministic.
offset += logits.numel()
# pytorch: offset must be multiple of 4
offset = (offset + logits.numel() + 3) // 4 * 4
state.view(torch.int64)[1] = offset
generator.set_state(state)
return random_sampled, logits_to_return
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