[Solved] Why does this code raise a TypeError? pipeline = EvaluationPipeline(inputs=None, evaluator=my_evaluator) results = pipeline.evaluate() | LangChain

LangChain - Evaluation and Testing

Why does this code raise a TypeError?

pipeline = EvaluationPipeline(inputs=None, evaluator=my_evaluator)
results = pipeline.evaluate()

ABecause pipeline must be instantiated with a string input

BBecause evaluator must be None for empty inputs

CBecause evaluate() requires no arguments

DBecause inputs cannot be None; must be a list or iterable

Step-by-Step Solution

Solution:

Step 1: Check inputs parameter requirements
Inputs must be a list or iterable; None is invalid and causes TypeError.
Step 2: Confirm evaluator can be any valid evaluator
Evaluator being non-None is correct; error is due to inputs.
Final Answer:
Because inputs cannot be None; must be a list or iterable -> Option D
Quick Check:
Inputs must be iterable, not None [OK]

Quick Trick: Inputs must be iterable, not None [OK]

Common Mistakes:

MISTAKES

Master "Evaluation and Testing" in LangChain

9 interactive learning modes - each teaches the same concept differently

More LangChain Quizzes

Why does this code raise a TypeError?