[Misc] Remove unused MultiModalHasher.hash_prompt_mm_data

[lgeiger]

Purpose

Since #14864 MultiModalHasher.hash_prompt_mm_data isn't used anymore. This PR removes the implementation as it's not necessary anymore.

Test Plan

Covered by unittests

Test Result

See CI

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello @lgeiger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on code cleanup by removing a method (hash_prompt_mm_data) within the MultiModalHasher class that was identified as unused after a previous refactoring (PR #14864). This simplifies the codebase by eliminating dead code and associated imports.

Highlights

• Code Removal: Removed the hash_prompt_mm_data method from MultiModalHasher as it is no longer used following changes in PR #14864.
• Cleanup: Removed unused imports (Optional, TYPE_CHECKING, TokensPrompt) that were only required by the removed method.

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[gemini-code-assist]

Code Review

This pull request removes the MultiModalHasher.hash_prompt_mm_data method and its associated unused imports (Optional from typing, and TokensPrompt under TYPE_CHECKING). The changes are clean and directly reflect the stated purpose of removing unused code.

Assuming the hash_prompt_mm_data method is indeed unused as stated in the pull request description (following #14864), these changes are a good cleanup step for maintainability. The type alias MultiModalHashDict, which was the return type of the removed function, is correctly retained as it appears to be used elsewhere in the codebase (e.g., in vllm/multimodal/inputs.py).

The PR description mentions that this is covered by unit tests, which is good. Overall, the changes look straightforward and beneficial.

[gemini-code-assist]

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