[CI] And PPL test for Qwen3.5.

[noooop]

Purpose

And PPL test for Qwen3.5.

Test Plan

tests/models/language/generation_ppl_test/test_qwen.py::test_ppl[model_info2]

Test Result

Model: Qwen/Qwen3.5-0.8B
VLLM: dtype:torch.bfloat16 head_dtype:torch.bfloat16 19.51075553894043
Transformers: Constant 19.38858413696289
Difference (%): 0.630120286837389

---

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.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[gemini-code-assist]

Code Review

This pull request adds a PPL test for the Qwen3.5 model and optimizes existing PPL tests for Gemma, GPT, and other Qwen models by pre-calculating and hardcoding the Hugging Face perplexity scores. This is a good approach to speed up CI. The changes are mostly correct, but I've found a minor style inconsistency in one of the test files that should be addressed.

[mergify]

Hi @noooop, the pre-commit checks have failed. Please run:

uv pip install pre-commit
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

Tip

Is mypy or markdownlint failing?

mypy and markdownlint are run differently in CI. If the failure is related to either of these checks, please use the following commands to run them locally:

# For mypy (substitute "3.10" with the failing version if needed)
pre-commit run --hook-stage manual mypy-3.10
# For markdownlint
pre-commit run --hook-stage manual markdownlint

[Isotr0py]

Otherwise LGTM

[mergify]

Hi @noooop, the pre-commit checks have failed. Please run:

uv pip install pre-commit
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

Tip

Is mypy or markdownlint failing?

mypy and markdownlint are run differently in CI. If the failure is related to either of these checks, please use the following commands to run them locally:

# For mypy (substitute "3.10" with the failing version if needed)
pre-commit run --hook-stage manual mypy-3.10
# For markdownlint
pre-commit run --hook-stage manual markdownlint