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docs: clarify Gemma 4 assistant speculative decoding#42180

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DarkLight1337 merged 2 commits into
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AbhiOnGithub:issue-42005-gemma4-mtp-docs
May 10, 2026
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docs: clarify Gemma 4 assistant speculative decoding#42180
DarkLight1337 merged 2 commits into
vllm-project:mainfrom
AbhiOnGithub:issue-42005-gemma4-mtp-docs

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@AbhiOnGithub

@AbhiOnGithub AbhiOnGithub commented May 9, 2026

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Purpose

Fixes #42005

Clarifies that Gemma 4 assistant checkpoints use vLLM's Gemma 4 MTP path rather than generic draft-model
speculative decoding.

This PR adds:

  • A note in the main speculative decoding guide
  • A Gemma 4 assistant example in the MTP guide
  • A cross-reference from the Gemma 4 supported-models note

Test Plan

  • git diff --check

Test Result

  • git diff --check passed.
Essential Elements of an Effective PR Description Checklist
  • The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
  • The test plan, such as providing test command.
  • The test results, such as pasting the results comparison before and after, or e2e results
  • (Optional) The necessary documentation update, such as updating supported_models.md and examples
    for a new model.

@AbhiOnGithub
docs: clarify Gemma 4 assistant speculative decoding
a3c1053 
Signed-off-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
claude[bot]
claude Bot reviewed May 9, 2026
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Claude Code Review

This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

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Documentation preview: https://vllm--42180.org.readthedocs.build/en/42180/

@mergify mergify Bot added the documentation Improvements or additions to documentation label May 9, 2026
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Code Review

This pull request updates the documentation to clarify that Gemma 4 assistant checkpoints should be used with the Multi-Token Prediction (MTP) speculative decoding path rather than as generic draft models. It includes a new section in the MTP guide with a usage example and updates the supported models documentation to link to these instructions. I have no feedback to provide.

@DarkLight1337 DarkLight1337 added verified Run pre-commit for new contributors without triggering other tests ready ONLY add when PR is ready to merge/full CI is needed labels May 10, 2026
@DarkLight1337 DarkLight1337 enabled auto-merge (squash) May 10, 2026 03:01
@DarkLight1337 DarkLight1337 merged commit 27d3bac into vllm-project:main May 10, 2026
12 of 13 checks passed
yiliu30 pushed a commit to yiliu30/vllm-fork that referenced this pull request May 11, 2026
@AbhiOnGithub @yiliu30
docs: clarify Gemma 4 assistant speculative decoding (vllm-project#42180
68e04d8 
)

Signed-off-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
Co-authored-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
weifang231 pushed a commit to weifang231/eb-vllm that referenced this pull request May 13, 2026
@AbhiOnGithub
docs: clarify Gemma 4 assistant speculative decoding (vllm-project#42180
8f7e82f 
)

Signed-off-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
Co-authored-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
@mohyeon

mohyeon commented May 15, 2026

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It has been confirmed to work properly on vLLM v0.21.0.
I succeeded using the following method.

CUDA_VISIBLE_DEVICES=0 vllm serve google/gemma-4-E4B-it
--host 0.0.0.0
--port 8002
--tensor-parallel-size 1
--trust-remote-code
--max-model-len 8192
--speculative-config '{"method":"mtp","model":"gg-hf-am/gemma-4-E4B-it-assistant","num_speculative_tokens":4}'

mfylcek pushed a commit to mfylcek/vllm that referenced this pull request May 19, 2026
@AbhiOnGithub @mfylcek
docs: clarify Gemma 4 assistant speculative decoding (vllm-project#42180
761f421 
)

Signed-off-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
Co-authored-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
jhu960213 pushed a commit to jhu960213/vllm that referenced this pull request May 20, 2026
@AbhiOnGithub
docs: clarify Gemma 4 assistant speculative decoding (vllm-project#42180
941ffcc 
)

Signed-off-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
Co-authored-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
mvanhorn pushed a commit to mvanhorn/vllm that referenced this pull request Jun 4, 2026
@AbhiOnGithub @mvanhorn
docs: clarify Gemma 4 assistant speculative decoding (vllm-project#42180
e1a4515 
)

Signed-off-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
Co-authored-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
Signed-off-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
knight0528 pushed a commit to knight0528/vllm that referenced this pull request Jun 8, 2026
@AbhiOnGithub @knight0528
docs: clarify Gemma 4 assistant speculative decoding (vllm-project#42180
cdcf70c 
)

Signed-off-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
Co-authored-by: AbhiOnGithub <abhiOnGithub@users.noreply.github.com>
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[Doc]: Gemma 4 assistant speculative decoding docs do not match actual behavior on vLLM 0.20.1

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