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What output will the following code produce?

medium📝 Predict Output Q4 of 15
LangChain - Evaluation and Testing
What output will the following code produce?
evaluator = ExactMatchEvaluator()
prediction = "LangChain"
reference = "LangChain"
result = evaluator.evaluate(prediction, reference)
print(result)
AFalse
BTrue
CNone
DAn error is raised
Step-by-Step Solution
Solution:
  1. Step 1: Understand ExactMatchEvaluator

    This evaluator returns True if prediction exactly matches the reference string.
  2. Step 2: Compare prediction and reference

    Both are "LangChain", so they match exactly.
  3. Step 3: Evaluate and print result

    evaluate() returns True, which is printed.
  4. Final Answer:

    True -> Option B
  5. Quick Check:

    Exact match returns True for identical strings [OK]
Quick Trick: ExactMatchEvaluator returns True if strings match exactly [OK]
Common Mistakes:
MISTAKES
  • Assuming partial matches return True
  • Expecting a numeric score instead of boolean
  • Confusing prediction and reference order

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