feat: add ContextualFaithfulnessEvaluator
#64
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This field stores documents from vector stores or retrieval systems, enabling RAG evaluation workflows where responses need validation against source context. [1] [1]: https://docs.aws.amazon.com/bedrock/latest/userguide/knowledge-base-evaluate.html
Mirrors the EvaluationData field so users can provide retrieved documents when defining test cases.
Pass retrieval_context from Case through to EvaluationData in both sync and async paths so evaluators can access it.
Defines a 4-tier rating scale from Not Faithful to Fully Faithful, with guidance on evaluating factual claims against retrieval context. Based on faithfulness metrics from RAG evaluation literature. [1] [1]: https://arxiv.org/abs/2309.01431
Validates whether response claims are grounded in retrieval context, designed specifically for RAG systems. Uses structured output with faithfulness tiers mapped to scores [0.0, 0.33, 0.67, 1.0]. This differs from FaithfulnessEvaluator which checks conversation history rather than retrieved documents. [1] [1]: https://docs.ragas.io/en/stable/concepts/metrics/available_metrics/faithfulness/
Tests the new field in Case and updates experiment serialization assertions to include retrieval_context.
Covers initialization, score mapping across all faithfulness tiers, input validation, prompt formatting behavior, async evaluation, and serialization.
Shows RAG evaluation with retrieval_context and updates the available evaluators list to include ContextualFaithfulnessEvaluator and HarmfulnessEvaluator.
stefanoamorelli
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ContextualFaithfulnessEvaluator
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Description
Adds
ContextualFaithfulnessEvaluatorfor RAG systems to detect hallucinations by validating whether response claims are grounded in retrieval context. This differs from the existingFaithfulnessEvaluatorwhich checks against conversation history rather than retrieved documents.The evaluator uses a 4-tier scoring system mapped to numeric values:
Also an optional
retrieval_contextfield toCaseandEvaluationDatafor passing retrieved data through the evaluation pipeline.Related Issues
#65
Documentation PR
Type of Change
New feature
Testing
New unit tests introduced
hatch run prepareChecklist
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