[Solved] Given this custom metric class, what will metric.evaluate(['hello'], ['hello']) return?... Given this custom metric class, what will metric.evaluate(['hello'], ['hello']) return? | LangChain

LangChain - Evaluation and Testing

Given this custom metric class, what will metric.evaluate(['hello'], ['hello']) return?

class ExactMatch(Evaluation):
    def evaluate(self, predictions, references):
        return sum(p == r for p, r in zip(predictions, references)) / len(references)

A1.0

B0.0

CError due to missing method

DNone

Step-by-Step Solution

Solution:

Step 1: Understand the evaluate method logic
It compares each prediction to the reference and counts matches, then divides by total references.
Step 2: Apply inputs to the method
With predictions=['hello'] and references=['hello'], the single pair matches, so sum is 1 and length is 1, result is 1/1 = 1.0.
Final Answer:
1.0 -> Option A
Quick Check:
Exact match count / total = 1.0 [OK]

Quick Trick: Check if predictions equal references, then divide [OK]

Common Mistakes:

MISTAKES

Forgetting to divide by length
Confusing sum with boolean values
Expecting method to return a list

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Given this custom metric class, what will metric.evaluate(['hello'], ['hello']) return?

Step 1: Understand the evaluate method logic

Step 2: Apply inputs to the method

Final Answer:

Quick Check:

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