[Solved] You run this code to evaluate a LangChain chain:result = my_chain.evaluate(input_data={'text':... | LangChain

LangChain - Evaluation and Testing

You run this code to evaluate a LangChain chain:

result = my_chain.evaluate(input_data={'text': 'Test'})
print(result)

But you get a TypeError saying evaluate() got an unexpected keyword argument 'input_data'. What is the likely cause?

AThe <code>my_chain</code> object is not a LangChain chain.

BThe <code>evaluate</code> method does not accept <code>input_data</code> as a parameter.

CYou forgot to import the <code>evaluate</code> function.

DThe <code>print</code> statement is incorrect.

Step-by-Step Solution

Solution:

Step 1: Analyze the error message
The error says evaluate() got an unexpected keyword argument input_data, meaning this argument is invalid.
Step 2: Understand method parameters
The evaluate method expects inputs differently, not as input_data. Passing unknown keywords causes this error.
Final Answer:
The evaluate method does not accept input_data as a parameter. -> Option B
Quick Check:
Wrong parameter name causes TypeError = B [OK]

Quick Trick: Check method parameters carefully in docs [OK]

Common Mistakes:

MISTAKES

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