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fix probs name which without temp scaling name - #9984

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hnyls2002 merged 6 commits into
sgl-project:mainfrom
narutolhy:fix_probs_without_temp_scaling_name
Sep 13, 2025
Merged

hnyls2002 merged 6 commits into
sgl-project:mainfrom
narutolhy:fix_probs_without_temp_scaling_name

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@narutolhy

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Motivation

Clarify the intent of the probs_without_temp_scaling tensor in logprob computation by assigning a more descriptive and consistent variable name. This improves readability and prevents confusion when debugging or maintaining code related to temperature scaling and RETURN_ORIGINAL_LOGPROB.

Modifications

Renamed the temporary variable from logprobs to probs_without_temp_scaling to better reflect that the tensor represents unscaled softmax probabilities used for original logprob computation.

No change in functionality or behavior; this is a pure refactor for clarity.

Before:
logprobs = torch.softmax(logits, dim=-1)

After:
probs_without_temp_scaling = torch.softmax(logits, dim=-1)

Accuracy Tests

This change does not affect any model outputs — logprobs are computed exactly the same way. Verified by rerunning:
'test_original_logprobs.py'

Checklist

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Summary of Changes

Hello @narutolhy, 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 is a pure refactoring effort aimed at enhancing code readability and maintainability. It clarifies the intent of a specific tensor used in logprob computation by assigning a more descriptive variable name, without altering any existing functionality or behavior.

Highlights

  • Variable Renaming for Clarity: The logprobs variable in python/sglang/srt/layers/sampler.py has been renamed to probs_without_temp_scaling. This change clarifies that the tensor represents unscaled softmax probabilities used for original logprob computation, improving readability and preventing confusion.
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Code Review

This pull request is a nice refactoring that improves code clarity by renaming a misleading variable. The change from logprobs to probs_without_temp_scaling accurately reflects that the variable holds probabilities before temperature scaling. I have one suggestion to improve a related code comment to prevent future confusion. Overall, this is a valuable improvement.

Comment thread python/sglang/srt/layers/sampler.py Resolved
Comment thread python/sglang/srt/layers/sampler.py Resolved
@narutolhy

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Hi @merrymercy @zhaochenyang20 , does this pr have any other problems? Thank you

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Ready to merge

@hnyls2002
hnyls2002 merged commit 99757cc into sgl-project:main Sep 13, 2025
0826joyce pushed a commit to 0826joyce/sglang-perf-opt that referenced this pull request May 19, 2026
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4 participants