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[Eval #2] Support evaluating traces and linking to run in OSS#18415

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B-Step62 merged 2 commits intomlflow:masterfrom
B-Step62:stack/migrate-eval-2
Oct 23, 2025
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[Eval #2] Support evaluating traces and linking to run in OSS#18415
B-Step62 merged 2 commits intomlflow:masterfrom
B-Step62:stack/migrate-eval-2

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@B-Step62 B-Step62 commented Oct 20, 2025

🥞 Stacked PR

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What changes are proposed in this pull request?

The OSS eval harness does not handle traces input today. This PR fixing it to make it parity with DBX harness, in preparation to the migration.

How is this PR tested?

  • Existing unit/integration tests
  • New unit/integration tests
  • Manual tests

Does this PR require documentation update?

  • No. You can skip the rest of this section.
  • Yes. I've updated:
    • Examples
    • API references
    • Instructions

Release Notes

Is this a user-facing change?

  • No. You can skip the rest of this section.
  • Yes. Give a description of this change to be included in the release notes for MLflow users.

What component(s), interfaces, languages, and integrations does this PR affect?

Components

  • area/tracking: Tracking Service, tracking client APIs, autologging
  • area/models: MLmodel format, model serialization/deserialization, flavors
  • area/model-registry: Model Registry service, APIs, and the fluent client calls for Model Registry
  • area/scoring: MLflow Model server, model deployment tools, Spark UDFs
  • area/evaluation: MLflow model evaluation features, evaluation metrics, and evaluation workflows
  • area/gateway: MLflow AI Gateway client APIs, server, and third-party integrations
  • area/prompts: MLflow prompt engineering features, prompt templates, and prompt management
  • area/tracing: MLflow Tracing features, tracing APIs, and LLM tracing functionality
  • area/projects: MLproject format, project running backends
  • area/uiux: Front-end, user experience, plotting, JavaScript, JavaScript dev server
  • area/build: Build and test infrastructure for MLflow
  • area/docs: MLflow documentation pages

How should the PR be classified in the release notes? Choose one:

  • rn/none - No description will be included. The PR will be mentioned only by the PR number in the "Small Bugfixes and Documentation Updates" section
  • rn/breaking-change - The PR will be mentioned in the "Breaking Changes" section
  • rn/feature - A new user-facing feature worth mentioning in the release notes
  • rn/bug-fix - A user-facing bug fix worth mentioning in the release notes
  • rn/documentation - A user-facing documentation change worth mentioning in the release notes

Fix existing trace handling in the MLflow GenAI Evaluation.

Should this PR be included in the next patch release?

Yes should be selected for bug fixes, documentation updates, and other small changes. No should be selected for new features and larger changes. If you're unsure about the release classification of this PR, leave this unchecked to let the maintainers decide.

What is a minor/patch release?
  • Minor release: a release that increments the second part of the version number (e.g., 1.2.0 -> 1.3.0).
    Bug fixes, doc updates and new features usually go into minor releases.
  • Patch release: a release that increments the third part of the version number (e.g., 1.2.0 -> 1.2.1).
    Bug fixes and doc updates usually go into patch releases.
  • Yes (this PR will be cherry-picked and included in the next patch release)
  • No (this PR will be included in the next minor release)

Signed-off-by: B-Step62 <yuki.watanabe@databricks.com>
Signed-off-by: B-Step62 <yuki.watanabe@databricks.com>
@B-Step62 B-Step62 marked this pull request as ready for review October 20, 2025 23:09
@B-Step62 B-Step62 added the team-review Trigger a team review request label Oct 20, 2025
@B-Step62 B-Step62 changed the title Support evaluating traces and linking to run in OSS [Eval #2] Support evaluating traces and linking to run in OSS Oct 20, 2025
@github-actions github-actions bot added area/evaluation MLflow Evaluation rn/bug-fix Mention under Bug Fixes in Changelogs. labels Oct 20, 2025
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Comment on lines 91 to 92
if isinstance(data, dict):
return data
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We don't need this anymore?

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Right, we don't need this if branch.

elif eval_item.trace is not None:
if _should_clone_trace(eval_item.trace, run_id):
try:
trace_id = copy_trace_to_experiment(eval_item.trace.to_dict())
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@serena-ruan serena-ruan Oct 22, 2025

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For my understanding, do we clone the trace so that we can add assessments on it? Because sometimes I feel this confusing seeing duplicate traces

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@B-Step62 B-Step62 Oct 22, 2025

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We only clone when the traces come from a different experiment, it is rare but sth like this

mlflow.set_experiment(experiment_id="123")

traces = mlflow.search_traces(experiment_ids=["456"])
mlflow.genai.evaluate(data=traces, ...)

In this case, we cannot show the original traces in the result UI because they are in the separate experiment, so we copy them to the current active experiment where the eval run will be logged.

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I see, that makes sense!

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LGTM!

@B-Step62 B-Step62 added this pull request to the merge queue Oct 23, 2025
Merged via the queue into mlflow:master with commit 0d6386d Oct 23, 2025
119 of 125 checks passed
@B-Step62 B-Step62 deleted the stack/migrate-eval-2 branch October 23, 2025 01:54
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2 participants