[Bugfix] Propagate VLLM_MARLIN_INPUT_DTYPE into INC/AutoRound quant path#49039
[Bugfix] Propagate VLLM_MARLIN_INPUT_DTYPE into INC/AutoRound quant path#49039lazypool wants to merge 1 commit into
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…ath (vllm-project#48904) AutoRound (INC) checkpoints route through inc_wna16_linear.py and inc_wna16_scheme.py, which construct Marlin linear/MoE methods but never assign input_dtype. The attribute defaults to None, so the Marlin kernel never enters the int8-activation branch regardless of the VLLM_MARLIN_INPUT_DTYPE env var. Fix by setting method.input_dtype = get_marlin_input_dtype() after construction, matching the pattern already used in auto_gptq.py:269 and auto_gptq.py:261 for the GPTQ/AWQ path. Co-authored-by: noonghunna <10742901+noonghunna@users.noreply.github.com> Co-authored-by: kevinb361 <91768207+kevinb361@users.noreply.github.com> Signed-off-by: lazypool <lazypool@proton.me>
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I validated the exact #49039 commit on a real 2× RTX 3090 AutoRound deployment using vLLM 0.25.1, with the separate negative-scale workaround from #48905 applied. Startup confirmed:
A controlled 550,000-character prefill completed coherently:
This confirms the INC/AutoRound dtype propagation works in the real serving path. This run was not a matched W4A16 A/B, so I’m not treating it as a standalone speedup measurement. The negative-scale issue remains a separate prerequisite for this checkpoint. |
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Fixes #48904.
AutoRound (INC) checkpoints route through
inc_wna16_linear.pyandinc_wna16_scheme.py, which construct Marlin linear/MoE methods but never assigninput_dtype. The attribute defaults toNone, so the Marlin kernel never enters the int8-activation branch regardless of theVLLM_MARLIN_INPUT_DTYPEenv var.Fix by setting
method.input_dtype = get_marlin_input_dtype()after construction, matching the pattern already used inauto_gptq.py:269andauto_gptq.py:261for the GPTQ/AWQ path.Verification
ruff checkandruff format --checkCo-authored-by: noonghunna 10742901+noonghunna@users.noreply.github.com
Co-authored-by: kevinb361 91768207+kevinb361@users.noreply.github.com