Strengthen input validation and tests for 'parse_raw_prompts’.

[mivehk]

Purpose

The ‘parse_raw_prompts’ can benefit from the stricter input validation in the array-of-arrays input path. This is for when input is a list of lists; however, we verify the nested inner list is a non-null list of integers beyond the first inner list verification.

Test Plan

Added a pytest coverage for invalid and edge-case inputs of mixed-type nested lists for parse_raw_prompts. Updated the array-of-arrays input condition of parse_raw_prompts to strictly check empty prompt lists within list and mixed-type nested lists. Validated these invalid inputs by running “pytest tests/test_inputs.py” to confirm correct exception types are raised for malformed inputs.

Test Result

Before this change, mixed-type nested prompt inputs were not checked for rejection and could lead to ambiguous behavior. After applying strict validation, the new and existing tests pass, and malformed inputs deterministically raise TypeError or ValueError as expected.

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[gemini-code-assist]

Code Review

This pull request aims to strengthen input validation for parse_raw_prompts, particularly for list-of-lists inputs. The changes introduce stricter checks and add a new test case. While the intent is good, the new validation logic in vllm/inputs/parse.py is not fully robust. It fails to correctly validate all elements in nested lists and doesn't consistently check for empty sub-lists. I've provided a critical review comment with a suggested code change to fix these validation flaws, ensuring all sub-prompts are correctly and thoroughly validated.

[mergify]

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

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

[DarkLight1337]

Thanks

[DarkLight1337]

PTAL at the failing test