LangChain - Chains and LCEL
Why might you choose to use
RunnablePassthrough instead of RunnableLambda when building a Langchain pipeline?Why might you choose to use RunnablePassthrough instead of RunnableLambda when building a Langchain pipeline?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand RunnablePassthrough's role
It returns input unchanged, useful when no processing is needed.Step 2: Compare with RunnableLambda
RunnableLambda runs a function, which adds processing overhead.Final Answer:
To keep input unchanged without extra processing overhead -> Option CQuick Check:
Passthrough = no processing overhead [OK]
Quick Trick: Use passthrough to avoid unnecessary processing [OK]
Common Mistakes:
- Thinking RunnableLambda can't handle strings
- Assuming passthrough modifies input
- Believing passthrough logs data automatically
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