[Doc][Example][Bugfix] Elements in local_device_ids should be casted …

[paulyu12]

What this PR does / why we need it?

It's a tiny bugfix in the gen_ranktable.py script. The script is an util to help setup an example case. It is used to prepare a ranktable before disaggregated prefill deployment.

Elements in local_device_ids list should be casted to int type before referred for a MOD math operation.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

No.

• vLLM version: v0.11.0rc3
• vLLM main: vllm-project/vllm@c9461e0

[gemini-code-assist]

Code Review

This pull request fixes a bug in the gen_ranktable.py example script where device IDs from the --local-device-ids argument were not converted to integers, causing errors in subsequent arithmetic operations. The fix is correct in its intent. My review includes a suggestion to make the implementation more robust by adding error handling for invalid inputs. This will prevent the script from crashing and provide a more user-friendly error message if a non-integer value is provided.

[github-actions]

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[Potabk]

Except for Gemini's review, LGTM

[paulyu12]

I've adjusted according to the Gemini's review.