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Examine the following code snippet for memory-augmented retrieval in langchain. What is the primary issue causing an error?

medium📝 Debug Q6 of 15
LangChain - Conversational RAG
Examine the following code snippet for memory-augmented retrieval in langchain. What is the primary issue causing an error? 
memory_store = SimpleMemory()
retriever = MemoryRetriever(memory_store, base_retriever=SomeRetriever())
ASimpleMemory() is not a valid memory store class in langchain.
BMemoryRetriever requires the memory parameter to be passed as a keyword argument.
CSomeRetriever() cannot be used as a base retriever with MemoryRetriever.
DMemoryRetriever does not accept any parameters during initialization.
Step-by-Step Solution
Solution:

  1. Step 1: Review MemoryRetriever initialization

    MemoryRetriever expects keyword arguments for memory and retriever.

  2. Step 2: Identify error in code

    Passing memory_store as a positional argument causes an error.

  3. Final Answer:

    MemoryRetriever requires the memory parameter to be passed as a keyword argument. -> Option B

  4. Quick Check:

    Always use keyword args for MemoryRetriever init. [OK]
Quick Trick: Pass memory as keyword argument: memory=... [OK]
Common Mistakes:
  • Passing memory as positional argument
  • Assuming SimpleMemory is invalid
  • Misunderstanding retriever compatibility

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