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[diffusion] Auto-skip diffusion tests when required pipeline class is missing from diffusers #21139

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mickqian merged 1 commit intosgl-project:mainfrom
yhyang201:gt-fix6
Mar 23, 2026
Merged

[diffusion] Auto-skip diffusion tests when required pipeline class is missing from diffusers #21139
mickqian merged 1 commit intosgl-project:mainfrom
yhyang201:gt-fix6

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@yhyang201
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Motivation

When a diffusion test case requires a pipeline class not available in the installed diffusers version, automatically mark it as skipped instead of failing, which prevents fail-fast from cancelling unrelated jobs in the CI matrix.

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

Review Process

  1. Ping Merge Oncalls to start the PR flow. See the PR Merge Process.
  2. Get approvals from CODEOWNERS and other reviewers.
  3. Trigger CI tests with comments or contact authorized users to do so.
    • /tag-run-ci-label, /rerun-failed-ci, /tag-and-rerun-ci
  4. After green CI and required approvals, ask Merge Oncalls to merge.

@yhyang201
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/tag-and-rerun-ci

@github-actions github-actions Bot added the diffusion SGLang Diffusion label Mar 22, 2026
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Summary of Changes

Hello, 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 improves the stability and robustness of the CI pipeline for diffusion-related tests. It introduces error handling that intelligently skips tests when the installed diffusers library lacks a necessary pipeline class, rather than causing a hard failure. This ensures that CI runs can proceed without being prematurely halted by environment-specific diffusers version discrepancies, allowing other tests to complete.

Highlights

  • Test Stability: Implemented error handling to automatically skip diffusion tests when a required diffusers pipeline class is not available in the installed version, preventing hard failures.
  • CI Robustness: Enhanced CI pipeline robustness by avoiding 'fail-fast' scenarios, ensuring that unrelated jobs are not cancelled due to diffusers version incompatibilities.

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Code Review

This pull request introduces a helpful change to automatically skip diffusion tests when a required pipeline class is missing from the installed diffusers version. This improves CI stability by preventing unrelated jobs from being cancelled. The implementation correctly uses a try...except block to catch server startup errors. My review includes a suggestion to make the error message checking more specific to diffusers to avoid unintentionally skipping tests due to unrelated errors, thus improving the robustness of the tests.

# pipeline class. This avoids hard failures when a model needs a
# newer diffusers release than what is currently installed in CI.
msg = str(exc)
if "not found in diffusers" in msg or "has no attribute" in msg:
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medium

The check for "has no attribute" in msg is too broad and could unintentionally skip tests that fail due to unrelated AttributeErrors, masking potential bugs. To make the check more robust, it should be scoped to errors originating from the diffusers library. This suggestion also adds a check for ImportError, which can also occur with older diffusers versions when a class is not found.

        if ("not found in diffusers" in msg
            or ("cannot import name" in msg and "from 'diffusers" in msg)
            or ("has no attribute" in msg and "diffusers" in msg)):

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/tag-and-rerun-ci

@mickqian mickqian merged commit 32a85ef into sgl-project:main Mar 23, 2026
122 of 131 checks passed
0-693 pushed a commit to 0-693/sglang that referenced this pull request Mar 25, 2026
JustinTong0323 pushed a commit to JustinTong0323/sglang that referenced this pull request Apr 7, 2026
yhyang201 added a commit to yhyang201/sglang that referenced this pull request Apr 22, 2026
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