fix(evaluator): Add langchain-community dep

[anastasia-nesterenko]

Summary

Fixes AIRCORE-723 by adding an explicit langchain-community>=0.3.27,<0.4 constraint for evaluator-related installs.

ragas==0.3.5 imports langchain_community.chat_models.vertexai, which is present in langchain-community==0.3.27 but removed in 0.4.x. PyPI installs were resolving langchain-community==0.4.2, causing RAGAS metrics to fail before scoring.

Changes

• Add langchain-community>=0.3.27,<0.4 to services/evaluator.
• Add the same constraint to the generated nemo-platform[evaluator-service] metadata.
• Update uv.lock with only the minimal dependency metadata needed for the new constraint.

Validation

• Verified the original import failure no longer reproduces:

  ragas 0.3.5
  langchain-community 0.3.27
  ragas load ok
  

Built the local nemo-platform wheel and confirmed PyPI metadata now includes:

Requires-Dist: langchain-community<0.4,>=0.3.27; extra == 'all'
Requires-Dist: langchain-community<0.4,>=0.3.27; extra == 'evaluator-service'
Requires-Dist: langchain-community<0.4,>=0.3.27; extra == 'services'

Ran:

uv lock --check
uv run --frozen pytest packages/nemo_evaluator_sdk/tests/metrics/ragas/test_git_patch.py -q

Summary by CodeRabbit

Chores

• Added the langchain-community library (constrained to >=0.3.27, <0.4) to the evaluator service's runtime dependencies.
• Included langchain-community (>=0.3.27, <0.4) in the platform's evaluator-service optional dependency set to align dependency constraints.

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📥 Commits

Reviewing files that changed from the base of the PR and between cc9d433 and 40fdf5a.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• packages/nemo_platform/pyproject.toml
• services/evaluator/pyproject.toml

🚧 Files skipped from review as they are similar to previous changes (2)

• packages/nemo_platform/pyproject.toml
• services/evaluator/pyproject.toml

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📝 Walkthrough

Walkthrough

langchain-community>=0.3.27,<0.4 is added as a runtime dependency in the evaluator service and as an optional dependency in the nemo-platform package, aligning dependency declarations across both projects.

Changes

langchain-community dependency update

Layer / File(s)	Summary
Add langchain-community dependency packages/nemo_platform/pyproject.toml, services/evaluator/pyproject.toml	langchain-community>=0.3.27,<0.4 is added to evaluator service runtime dependencies and nemo-platform evaluator-service optional dependencies.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	Title accurately summarizes the main change: adding langchain-community dependency to the evaluator service to fix a module import failure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch anesterenko/aircore-723-nvbug-ragas-metrics-fail-no-module-named

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[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	18711/24749	75.6%	62.1%
Integration Tests	11989/23513	51.0%	26.1%