[Solved] What is the issue with this code snippet?lambda_runner = RunnableLambda(lambda x: x * 2) result = lambda_runner.invoke() | LangChain

LangChain - Chains and LCEL

What is the issue with this code snippet?

lambda_runner = RunnableLambda(lambda x: x * 2)
result = lambda_runner.invoke()

AThe lambda function is invalid because it uses multiplication.

Binvoke() is called without the required input argument.

CRunnableLambda cannot be instantiated with a lambda function.

DThe code will run without errors and return None.

Step-by-Step Solution

Solution:

Step 1: Check RunnableLambda usage
RunnableLambda expects an input argument when invoke() is called.
Step 2: Analyze the code
invoke() is called without any argument, which causes an error.
Final Answer:
invoke() is called without the required input argument. -> Option B
Quick Check:
invoke() requires input parameter [OK]

Quick Trick: invoke() must always receive input argument [OK]

Common Mistakes:

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