test_eval_chain() — langchain Function Reference

Architecture documentation for the test_eval_chain() function in test_eval_chain.py from the langchain codebase.

Function python LangChainCore ApiManagement

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LangChainCore→ ApiManagement→ test_eval_chain() — langchain Function Reference

Dependency Diagram

graph TD
  e9e55ef7_e7d4_8c9f_db9f_dd8cd3f5479f["test_eval_chain()"]
  919cda35_c0f5_cbb5_866a_0591c5815209["test_eval_chain.py"]
  e9e55ef7_e7d4_8c9f_db9f_dd8cd3f5479f -->|defined in| 919cda35_c0f5_cbb5_866a_0591c5815209
  style e9e55ef7_e7d4_8c9f_db9f_dd8cd3f5479f fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/tests/unit_tests/evaluation/qa/test_eval_chain.py lines 25–34

def test_eval_chain() -> None:
    """Test a simple eval chain."""
    example = {"query": "What's my name", "answer": "John Doe"}
    prediction = {"result": "John Doe"}
    fake_qa_eval_chain = QAEvalChain.from_llm(FakeLLM())

    outputs = fake_qa_eval_chain.evaluate([example, example], [prediction, prediction])
    assert outputs[0] == outputs[1]
    assert fake_qa_eval_chain.output_key in outputs[0]
    assert outputs[0][fake_qa_eval_chain.output_key] == "foo"