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[Cherry-pick to release/v0.5.16] [spec decoding] fix inkling multi layer mtp draft extend cuda graph (#32254) #32260

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Merged
Qiaolin-Yu merged 1 commit into from
Jul 23, 2026
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[Cherry-pick to release/v0.5.16] [spec decoding] fix inkling multi layer mtp draft extend cuda graph (#32254) #32260

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8 changes: 6 additions & 2 deletions python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -673,8 +673,12 @@ def _draft_extend_for_decode(
# Batch 2: Draft extend
draft_extend_input = EagleDraftExtendInput(
hidden_states=batch_result.logits_output.hidden_states,
# Actual width: the multi-layer chain fills num_steps + 1 rows/req.
num_tokens_per_req=self.speculative_num_steps + 1,
# Actual width: the multi-layer chain fills num_steps + 1 rows/req,
# plus the boundary-KV front rows when the widened window is active
# (must match the capture width in the draft-extend graph runner).
num_tokens_per_req=self.speculative_num_steps
+ 1
+ self.draft_extend_num_front_tokens,
num_tokens_for_logprob_per_req=1,
num_front_tokens=self.draft_extend_num_front_tokens,
)
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