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[Bugfix][Core] Validate prompt token ids when skip_tokenizer_init is set - #62911

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DarkLight1337 merged 3 commits into
vllm-project:mainfrom
Chocolatine75:skip-tokenizer-init-upstream
Oct 22, 2026
Merged

DarkLight1337 merged 3 commits into
vllm-project:mainfrom
Chocolatine75:skip-tokenizer-init-upstream

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@Chocolatine75

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Purpose

Renderer.validate_token_ids skips the vocab range check when there is no
tokenizer, so with --skip-tokenizer-init out-of-range prompt token ids are
not rejected. This runs the check whenever token ids are present, using the
model vocab size as the bound when there is no tokenizer.

No existing PR covers this.

Test Plan

  • pre-commit on the changed files
  • New test test_out_of_vocab_token_skip_tokenizer_init

Test Result

  • pre-commit passes.
  • On CPU with gpt2, id 999999 now raises Token id 999999 is out of vocabulary with and without skip_tokenizer_init (ran with
    gpu_memory_utilization=0.2, not enough free RAM for the test default).

Written with the help of a custom AI agent harness.

`Renderer.validate_token_ids` returned early when there is no tokenizer,
so out-of-range ids were not rejected with `--skip-tokenizer-init`. Run
the check whenever token ids are present, using the model vocab size as
the bound without a tokenizer.

Assisted-by: custom AI agent harness
Signed-off-by: Matteo ATKINSON <matteoatkinson@gmail.com>

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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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@mergify mergify Bot added the bug Something isn't working label Oct 21, 2026
@jperezdealgaba jperezdealgaba added the ready ONLY add when PR is ready to merge/full CI is needed label Oct 21, 2026
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/ci run

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✅ @Chocolatine75, CI is now available for this PR.

  • /ci run starts upstream CI; /amd-ci run starts AMD CI only.
  • Run commands test your branch with every commit currently on its upstream target branch. If it is behind, the bot merges the target branch into it first (pull before pushing again). Append --allow-stale to a run command to test an outdated branch as is, at your own risk.
  • /ci retry retries failed jobs in the CI build for the current PR head. If the current head has no CI build, it starts a new CI build for the current head containing only jobs that failed in the latest earlier CI build for this PR.
  • /amd-ci retry retries failed jobs in AMD CI for the current PR head. Use /amd-ci run when the current head has no AMD CI build.
  • /ci cancel cancels scheduled or running CI builds for this PR branch; /amd-ci cancel does the same for AMD CI only.

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❌ This PR is 6 commits behind upstream main. The bot could not merge upstream main into this branch (the merge commit did not appear in time). No new CI build was started. Either merge or rebase onto the latest main yourself and rerun /ci run, or use /ci run --allow-stale to test this branch as is.

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/ci run --allow-stale

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✅ Triggered Buildkite CI #96440 for commit 23e58430b776.

⚠️ This PR is 9 commits behind upstream main. Running CI at your own risk because --allow-stale was requested; outdated CI configuration may cause failures. Before merging, merge or rebase onto the latest main, then rerun /ci run on the latest PR commit.

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/ci run

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✅ Triggered Buildkite CI #96451 for commit bc10345818ca.

ℹ️ This PR is 8 commits behind upstream main. Merged upstream main into this branch as bc10345818ca before starting CI. Pull the branch before pushing more changes.

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/ci retry

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✅ Queued 1 failed job(s) for retry in Buildkite CI #96451.

@DarkLight1337
DarkLight1337 merged commit 47e2b61 into vllm-project:main Oct 22, 2026
182 checks passed
bantianyue pushed a commit to bantianyue/vllm that referenced this pull request Oct 28, 2026
…set (vllm-project#62911)

Signed-off-by: Matteo ATKINSON <matteoatkinson@gmail.com>
Co-authored-by: vllm-agent <claw@inferact.ai>
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4 participants