[WIP][RC] Update PyTorch to 2.8.0

[atalman]

Signed-off-by: Huy Do [email protected]## 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.

Purpose

Test Plan

Test Result

(Optional) Documentation Update

[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.

💬 Join our developer Slack at https://slack.vllm.ai to discuss your PR in #pr-reviews, coordinate on features in #feat- channels, or join special interest groups in #sig- channels.

Just a reminder: PRs would not trigger full CI run by default. Instead, it would only run fastcheck CI which starts running only a small and essential subset of CI tests to quickly catch errors. You can run other CI tests on top of those by going to your fastcheck build on Buildkite UI (linked in the PR checks section) and unblock them. If you do not have permission to unblock, ping simon-mo or khluu to add you in our Buildkite org.

Once the PR is approved and ready to go, your PR reviewer(s) can run CI to test the changes comprehensively before merging.

To run CI, PR reviewers can either: Add ready label to the PR or enable auto-merge.

🚀

[gemini-code-assist]

Code Review

This pull request updates PyTorch to version 2.8.0 and adjusts related dependencies and configurations accordingly. The changes appear consistent with this goal across various files, including Dockerfiles, CMakeLists, and requirements files.

I've identified a couple of temporary/debugging code snippets that should be removed before this work-in-progress PR is finalized for merging. These are located in a test script and the main Dockerfile.

[gemini-code-assist]

These changes are marked as temporary for testing and should be removed. Merging this would introduce test-specific logic into a test script that should reflect the final installation process. Please revert these changes to the original pip3 install command.

Suggested change

	# TESTING, TO BE REMOVED
	VLLM_TEST_USE_PRECOMPILED_NIGHTLY_WHEEL=1 VLLM_USE_PRECOMPILED=1 pip3 install -vvv -e . \
	--extra-index-url https://download.pytorch.org/whl/test/cu128
	pip3 install nvidia-cudnn-cu12==9.5.1.17 --force-reinstall
	VLLM_TEST_USE_PRECOMPILED_NIGHTLY_WHEEL=1 VLLM_USE_PRECOMPILED=1 pip3 install -vvv -e .

[gemini-code-assist]

The DEBUG comment and the python3 -m xformers.info command appear to be for debugging purposes. Please remove them before merging to keep the Dockerfile clean.

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @atalman.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

[github-actions]

This pull request has been automatically marked as stale because it has not had any activity within 90 days. It will be automatically closed if no further activity occurs within 30 days. Leave a comment if you feel this pull request should remain open. Thank you!

[DarkLight1337]

Closing as superseded by #20358