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[Cherry-pick][releases/v0.26.0rc][Bugfix][MRV2][Spec Decode] Fix draft token offset in bad words kernel (from #14433) #14526

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Merged
zzzzwwjj merged 1 commit into from
Aug 20, 2026
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[Cherry-pick][releases/v0.26.0rc][Bugfix][MRV2][Spec Decode] Fix draft token offset in bad words kernel (from #14433) #14526

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4 changes: 3 additions & 1 deletion vllm_ascend/worker/v2/sample/bad_words.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,8 +112,10 @@ def _bad_words_kernel(
# Calculate actual position and load actual token
actual_pos = effective_len - prefix_len + j
if actual_pos >= output_len:
# input_ids at local position 0 is the last committed token;
# draft tokens start at local position 1.
spec_offset = actual_pos - output_len
actual = tl.load(input_ids_ptr + cur_req_first_pos + spec_offset)
actual = tl.load(input_ids_ptr + cur_req_first_pos + spec_offset + 1)
else:
actual = tl.load(output_base + actual_pos)

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