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[Bugfix] Reapply 50869 #52223

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Merged
vllm-bot merged 1 commit into from
Aug 13, 2026
Merged

[Bugfix] Reapply 50869 #52223

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24 changes: 0 additions & 24 deletions vllm/config/speculative.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1096,30 +1096,6 @@ def __post_init__(self):

dspark_draft_topk = None
if self.method == "dspark":
# DSpark is a semi-autoregressive *block* drafter. A
# speculative length smaller than the checkpoint's block
# feeds the block / Markov-head machinery an unsupported
# layout and yields incorrect (garbled) output rather than
# merely lower acceptance. Require num_speculative_tokens to
# be at least the block size (e.g. 5 or 7 for DeepSeek-V4).
dspark_block_size = getattr(
self.draft_model_config.hf_config,
"dspark_block_size",
None,
)
if (
dspark_block_size is not None
and self.num_speculative_tokens < dspark_block_size
):
raise ValueError(
"DSpark requires num_speculative_tokens >= "
f"dspark_block_size ({dspark_block_size}); got "
f"{self.num_speculative_tokens}. Smaller values "
"produce incorrect output. Use "
f"num_speculative_tokens={dspark_block_size} or "
"larger (e.g. 7)."
)

hf_config = self.draft_model_config.hf_config
dspark_draft_topk = self.dspark_draft_topk
if dspark_draft_topk is None:
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