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pytorch - 💡(How to fix) Fix [CI] Improve workflows through checks whether fails are unrelated [3 comments, 2 participants]

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pytorch/pytorch#178837•Fetched 2026-04-08 01:52:04
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Root Cause

There are very frequent CI failures (I estimate in about 70% of pull requests), and this is very exhausting and time-consuming because most of them are unrelated. In those cases, a maintainer with merge permissions such as -i or -f is always required. This means maintainers have to repeatedly spend a lot of time reviewing pull requests with unrelated failures. Although there have already been some improvements, such as automatically excluding Trunk flaky checks, there are still often individual failures—such as failed start connections or timeouts in individual pull requests—that are not related to the changes and therefore occur independently of Trunk flakiness.

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🚀 The feature, motivation and pitch

There are very frequent CI failures (I estimate in about 70% of pull requests), and this is very exhausting and time-consuming because most of them are unrelated. In those cases, a maintainer with merge permissions such as -i or -f is always required. This means maintainers have to repeatedly spend a lot of time reviewing pull requests with unrelated failures. Although there have already been some improvements, such as automatically excluding Trunk flaky checks, there are still often individual failures—such as failed start connections or timeouts in individual pull requests—that are not related to the changes and therefore occur independently of Trunk flakiness.

Regarding the proposal: it has been observed that Claude is very effective at reviewing reverted pull requests for newly introduced CI failures or identifying whether the failure is only due to the revert bot.

Therefore, I propose that we instruct the PyTorch bot to always ping Claude whenever it encounters check failures and is about to prevent a merge. Claude should then review the check failures and determine whether they are related or unrelated to the changes.

The instruction to Claude should be very precise: Claude must include a sentence in its response that clearly states either “Check failure is unrelated” or “Check failure is not unrelated.” Based on this statement, the PyTorch bot should then decide whether to proceed with merge -i or not.

Additionally, Claude could include a confidence score and only approve a direct merge if the confidence is above 99%.

The same approach could also be applied to reverted pull requests that are merged again when Claude has determined the failures to be unrelated (potentially also including a percentage-based confidence).

Alternatives

No response

Additional context

An example of significant difficulties caused by unrelated failures is issue #178685, along with many others from my own experience—and most likely also from yours. This applies regardless of whether you are a maintainer or not. As a maintainer, you always have to review the changes again and trigger a new merge, while as a regular contributor, you very often notice that your pull requests do not pass on the first attempt. As a result, you frequently have to repeatedly contact a maintainer to get things moving again.

cc @seemethere @malfet @pytorch/pytorch-dev-infra

extent analysis

Fix Plan

To address the issue of frequent CI failures, we will implement a bot-based solution that pings Claude for review when check failures occur. Here are the steps:

  • Update the PyTorch bot to ping Claude when check failures are encountered
  • Instruct Claude to review check failures and respond with one of two statements:
    • "Check failure is unrelated"
    • "Check failure is not unrelated"
  • Configure the PyTorch bot to proceed with merge -i if Claude responds with "Check failure is unrelated" and includes a confidence score above 99%

Example code snippet for the PyTorch bot:

import requests

def ping_claude(check_failure):
    url = "https://example.com/claude-review"
    data = {"check_failure": check_failure}
    response = requests.post(url, json=data)
    return response.json()

def proceed_with_merge(claude_response):
    if claude_response["statement] == Check failure is unrelated" and claude_response["confidence"] > .99:
        # Proceed with merge -i
        print("Merging...")
    else:
        # Do not proceed with merge
        print("Not merging...")

Verification

To verify that the fix worked, we can monitor the number of CI failures and the time spent by maintainers reviewing pull requests. We can also track the number of successful merges and the confidence scores provided by Claude.

Extra Tips

  • Ensure that Claude's review process is efficient and accurate to minimize delays in the merge process
  • Consider implementing a timeout or retry mechanism for Claude's responses to handle cases where the review takes too long
  • Monitor the performance of the PyTorch bot and Claude's review process to identify areas for improvement.

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