[Spec][Ngram] Clean up unused stateless batchMatch

[kpham-sgl]

Motivation

After #21243, Ngram::batchMatch became stateful. However there is still an old stateless relics left from before (possible result of merge conflicts resolution - my bad).

Note: the stateful batchMatch takes in const std::vector<int64_t>& state_ids while the stateless batchMatch does not. Also the state is only passed down to the Trie build function

Modifications

Remove the dead stateless Ngram::batchMatch code.

Accuracy Tests

N/A

Speed Tests and Profiling

N/A

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

Review and Merge Process

1. Ping Merge Oncalls to start the process. See the PR Merge Process.
2. Get approvals from CODEOWNERS and other reviewers.
3. Trigger CI tests with comments or contact authorized users to do so.
   • Common commands include /tag-and-rerun-ci, /tag-run-ci-label, /rerun-failed-ci
4. After green CI and required approvals, ask Merge Oncalls or people with Write permission to merge the PR.

[kpham-sgl]

/tag-and-rerun-ci

[gemini-code-assist]

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[kpham-sgl]

/rerun-test registered/unit/spec/test_ngram_corpus.py

[kpham-sgl]

/rerun-test test/registered/spec/test_ngram_speculative_decoding.py

[github-actions]

✅ ubuntu-latest (1 test): View workflow run

cd test/ && python3 registered/unit/spec/test_ngram_corpus.py

[github-actions]

✅ 1-gpu-h100 (1 test): View workflow run

cd test/ && python3 registered/spec/test_ngram_speculative_decoding.py