feat(eval): add ClassifierEvaluator (pure-metadata aggregator)#1674
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feat(eval): add ClassifierEvaluator (pure-metadata aggregator)#1674ajay-kesavan wants to merge 7 commits into
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Adds a new evaluator type whose role is to carry a `classes` list and a `source_evaluator` name to downstream consumers. It does not compute classification metrics per datapoint — that work moves to the Studio Web C# backend, which reads each datapoint's agent output and the source evaluator's expected label after the per-datapoint loop finishes, scans the output for each configured class, and builds the confusion matrix. The per-datapoint evaluate() returns score=0.0 with a ClassifierJustification(classes, source_evaluator) details payload. This payload survives the existing CLI -> backend wire path via StudioWebProgressReporter._serialize_justification (json.dumps of the model_dump), arriving in the backend as a JSON string inside CodedEvaluatorScore.Justification where the C# layer can read it. Replaces the design in earlier draft PRs #1669 and #5307: the SDK no longer owns the dataset-level computation. The pure-config approach is ~50 LOC instead of ~1500 LOC of dataset-evaluator framework + worker workflow + factory + child workflow plumbing. Files: src/uipath/eval/evaluators/classifier_evaluator.py new (~90 LOC) src/uipath/eval/evaluators/__init__.py re-export + EVALUATORS list src/uipath/eval/evaluators/evaluator.py discriminator + Union entry src/uipath/eval/models/models.py EvaluatorType.CLASSIFIER tests/evaluators/test_classifier_evaluator.py 9 unit tests, all passing Verified: pytest tests/evaluators tests/cli/eval --no-cov -> 824 passed ruff check / ruff format / mypy -> clean Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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added
test:uipath-langchain
A minimal 3-class intent classification agent (book / cancel / reschedule)
that exercises the new ClassifierEvaluator end-to-end via `uipath eval`.
Mirrors the wire shape Studio Web will see once the C# backend and frontend
PRs land, so SDK changes can be validated standalone before the full stack
is brought up.
Layout:
main.py — keyword classifier returning {"intent": "..."}
evaluations/
eval-sets/main.json
evaluators/
intent_match.json per-datapoint ExactMatch on .intent
intent_classifier.json new uipath-classifier with classes + sourceEvaluator
README.md — Path A (SDK CLI) + Path B (Studio Web) instructions
Each datapoint has `evaluationCriterias.intent_classifier: {}` (the runtime
skips evaluators that aren't keyed there). 6/9 datapoints are correctly
classified by design; the resulting (expected, actual) pairs flow through
the existing CLI -> backend wire path inside the classifier's justification
payload as classes/source_evaluator metadata.
Verified live:
- ExactMatch averages to 0.7 (6/9 correct).
- ClassifierEvaluator emits {"expected":"","actual":"","classes":[...],
"source_evaluator":"intent_match"} per datapoint.
- Plugging the (expected, actual) pairs from the resulting output into the
same confusion-matrix math the C# helper implements yields macro F1 of
0.667 on this fixture — the number Studio Web's Aggregations panel
would render once the backend pipeline is live.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Pydantic's generic resolution leaves T = typing.Any when a TypeVar is parameterized with its own bound (BaseEvaluationCriteria here), so BaseEvaluator[BaseEvaluationCriteria, ...] tripped the runtime's "X must be a subclass of BaseEvaluationCriteria" guard at load time: Failed to create evaluator from file 'evaluations/evaluators/classifier-*.json': typing.Any must be a subclass of BaseEvaluationCriteria. Introduce an empty ClassifierEvaluationCriteria(BaseEvaluationCriteria) subclass and parameterize Config + Evaluator with it. Mirrors how every other built-in evaluator (ExactMatch via OutputEvaluationCriteria, etc.) provides a concrete criteria type even when no per-datapoint fields are needed.
This was referenced May 22, 2026
Replaces the standalone ClassifierEvaluator with an `aggregators` config field on per-datapoint evaluators (ExactMatch first). Run-level classification metrics are now driven by the host evaluator's config, not by a separate evaluator with a source-evaluator ID reference. Design rationale (see Confluence "Design for Precision and Recall" §5.2): the standalone evaluator forced users to add TWO evaluators and copy an opaque ID between them. Moving aggregator config onto the evaluator that already emits the labels keeps the source of truth in one place and makes the JSON file portable across conversions (e.g. low-code -> coded). - New module `_aggregators.py` with AggregatorSpec / ClassificationAggregatorSpec - ExactMatchEvaluatorConfig gains optional `aggregators: list[AggregatorSpec] | None` The Python runtime ignores the field; it's metadata for the downstream C# aggregation pass. - `_progress_reporter.py:_build_evaluator_snapshot` now also emits `aggregators` so the field flows into EvaluatorRun.EvaluatorSnapshot and the C# layer can discover it without consulting the eval set definition file separately. Bug fix: previously the builder only emitted prompt+model (LLM-judge only), so for ExactMatch the dict was empty and the snapshot ended up null in the wire payload. - ClassifierEvaluator, ClassifierEvaluationCriteria, ClassifierJustification, ClassifierEvaluatorConfig: all deleted. - EvaluatorType.CLASSIFIER enum value removed. - Discriminator union in evaluator.py drops the Classifier branch. Version bump 2.10.70 -> 2.10.72 (the previous .71 was an unused dev cache-bust). The new ExactMatch.aggregators field is a public API change. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Switches aggregator transport from the evaluator snapshot to the per-datapoint justification (the snapshot path was coded-only; the justification path works for both coded and low-code). - ExactMatchJustification gains an optional `aggregators` field; evaluate() embeds config.aggregators into the justification it already emits. - Reverts the _build_evaluator_snapshot extension (no longer the transport). Design: aggregator config lives on the evaluator (single source of truth, no cross-evaluator FK), travels per-datapoint in the justification, and is computed once by the C# post-pass. See Confluence "Design for Precision and Recall" §5. uv.lock: sync uipath 2.10.70 -> 2.10.72 (version bumped for the public ExactMatch.aggregators field + to invalidate uv's build cache during dev). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds run-level aggregator support to the legacy (low-code) ExactMatch so it
reaches parity with the coded ExactMatch.
- LegacyExactMatchEvaluatorConfig / the evaluator gain an optional `aggregators`
field (top-level, aliased "aggregators"), deserialized from the legacy
evaluator JSON authored by the low-code editor.
- evaluate() emits a JSON-string `details` of {expected, actual, aggregators}
when aggregators are configured. Legacy justification is typed `str` (J=str),
so _serialize_justification passes the string through verbatim — it lands in
EvalScore.Justification on the C# side, where the low-code aggregation pass
reads it.
No behavioral change when aggregators is unset (details stays None).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Chibionos
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Jun 2, 2026
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PR #1674 Review — eval aggregators (ExactMatch.aggregators)
Verdict: 🔴 Request changes — does not work as shipped.
The design pivoted mid-PR (commit e92e734) from a standalone ClassifierEvaluator to run-level aggregators on ExactMatch. The production SDK code reflects the new design and is architecturally sound — but the test file, the sample, and the README were left behind referencing the deleted design.
I verified everything empirically on the PR head (checked out, ran the suites, ran the sample):
pytest tests/evaluators→ 1 error, 0 tests collected (import crash — C1)- with the broken file removed → 3 FAILED, 812 passed (H2)
- sample README "Path A"
uipath evalrun → crashes (C2)
3 critical / 2 high / 2 medium / 1 low. Findings inline.
✅ Architecture (verified OK — not blocking)
The SDK plumbing itself is correct: _serialize_justification does json.dumps(model_dump()) for BaseModel justifications and passes legacy str through verbatim; validate_justification re-validates the dict back into ExactMatchJustification; the aggregator round-trip is alias-safe (populate_by_name=True, no multi-word fields). The shipped code works — the scaffolding is stale.
🎚️ Slop meter
28/100 slop · 0/100 tunnel-vision. behavior_without_test=0 is a false negative — it sees a test file present but can't tell it tests deleted code (see H3).
🤖 Codex recheck
Could not run — local Codex auth token expired.
🔵 Before merge
Branch is CONFLICTING and bumps 2.10.70 → 2.10.72 (also collides with #1632's bump). Rebase on main.
Adversarial + deep-review pass; all claims verified on the PR head.
| [project] | ||
| name = "uipath" | ||
| version = "2.10.70" | ||
| version = "2.10.72" |
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🔵 L1 — version bump + conflict
2.10.70 → 2.10.72; the comment in the original commit notes .71 was an unused dev cache-bust. Branch is CONFLICTING and this line will collide with #1632's → 2.10.68. Rebase before merge.
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Ack — handing the rebase + version-bump conflict back to @ajay-kesavan to resolve locally. Leaving this thread open until the rebase lands so the conversation tracks the final version number.
2 tasks
- Replace stale ClassifierEvaluator tests with real ExactMatch and LegacyExactMatch aggregator round-trip coverage (C1, H3). - Rebuild classifier_demo to attach aggregators to intent_match ExactMatch config instead of a separate dead evaluator (C2, M1, H1). - Pin ExactMatchJustification in existing justification-type tests (H2). - Modernize typing: Optional[X] -> X | None (M2). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Pull request overview
This PR extends the eval framework to support run-level aggregators (starting with a classification aggregator) by attaching aggregator config to ExactMatch and carrying it through to downstream consumers via per-datapoint justifications (coded: structured justification model; low-code/legacy: JSON-string details).
Changes:
- Add aggregator spec models (
ClassificationAggregatorSpec) and expose them fromuipath.eval.evaluators. - Extend coded
ExactMatchEvaluatorto acceptaggregatorsin config and emit them inExactMatchJustification; extend legacyLegacyExactMatchEvaluatorto emit aggregator metadata via JSON-stringdetails. - Add tests pinning the wire shape and add an end-to-end sample project; bump SDK version to
2.10.72.
Reviewed changes
Copilot reviewed 15 out of 16 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| packages/uipath/uv.lock | Bumps locked package version to 2.10.72. |
| packages/uipath/pyproject.toml | Bumps project version to 2.10.72. |
| packages/uipath/src/uipath/eval/evaluators/_aggregators.py | Introduces aggregator spec model(s) (classification). |
| packages/uipath/src/uipath/eval/evaluators/exact_match_evaluator.py | Adds aggregators to config and new ExactMatchJustification carrying aggregator metadata. |
| packages/uipath/src/uipath/eval/evaluators/legacy_exact_match_evaluator.py | Adds optional aggregators field and emits JSON-string details when configured. |
| packages/uipath/src/uipath/eval/evaluators/init.py | Re-exports aggregator spec types. |
| packages/uipath/tests/evaluators/test_exact_match_aggregators.py | New tests validating aggregator propagation and wire-format round-trip. |
| packages/uipath/tests/evaluators/test_evaluator_schemas.py | Updates justification schema expectations for ExactMatch. |
| packages/uipath/tests/evaluators/test_evaluator_methods.py | Updates justification-type assertions for ExactMatch. |
| packages/uipath/samples/classifier_demo/uipath.json | Adds sample function manifest. |
| packages/uipath/samples/classifier_demo/README.md | Documents the end-to-end demo flow for classification aggregation. |
| packages/uipath/samples/classifier_demo/pyproject.toml | Adds sample project metadata/deps. |
| packages/uipath/samples/classifier_demo/main.py | Adds sample keyword classifier agent. |
| packages/uipath/samples/classifier_demo/bindings.json | Adds sample bindings. |
| packages/uipath/samples/classifier_demo/evaluations/evaluators/intent_match.json | Sample evaluator JSON showing ExactMatch + classification aggregator config. |
| packages/uipath/samples/classifier_demo/evaluations/eval-sets/main.json | Sample eval set fixture for the demo. |
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| @@ -0,0 +1,42 @@ | |||
| """Tiny intent-classification agent for the ClassifierEvaluator demo. | |||
| [project] | ||
| name = "classifier-demo" | ||
| version = "0.0.1" | ||
| description = "Tiny intent-classification agent that exercises the new ClassifierEvaluator end-to-end via `uipath eval`." |
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What
Adds run-level aggregators to the eval framework — starting with a
classificationaggregator that builds a confusion matrix + precision/recall/F1 across a fixed class list. Works for both coded and low-code agents.Architectural decisions (full record in Confluence: Design for Precision and Recall §5)
1. Aggregator config lives ON the evaluator, not as a separate evaluator.
We rejected a standalone
Classifierevaluator (with asource_evaluatorID pointer) because it forced users to add two evaluators and copy an opaque ID, and the pointer broke during low-code→coded conversion. Config now lives onExactMatch.aggregators— single source of truth, no cross-evaluator FK, travels with the evaluator JSON file.2. Transport via per-datapoint justification, not the evaluator snapshot.
The snapshot mechanism is coded-only (low-code uses a different entity). The justification is persisted by BOTH pipelines, so it's the portable channel.
ExactMatchJustification/ the legacydetailsstring carry theaggregatorslist per datapoint (identical content; deduped downstream).Changes in this PR (SDK)
ExactMatchEvaluatorConfig.aggregators(optional) +ExactMatchJustification.aggregators;evaluate()embeds it._aggregators.py:AggregatorSpec/ClassificationAggregatorSpec.LegacyExactMatchEvaluator(low-code): gains anaggregatorsfield; emits a JSON-stringdetailsof{expected, actual, aggregators}(legacy J=str, so the string passes through_serialize_justificationverbatim → lands inEvalScore.Justificationon the C# side)._build_evaluator_snapshotaggregators extension (no longer the transport).ClassifierEvaluator+EvaluatorType.CLASSIFIER.Compatibility
Optional config field (default
None) → existing evaluators unchanged. When unset, noaggregatorsin the justification and the downstream pass no-ops.Test plan