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What happens if the memory store is empty when a query is made to a memory-augmented retriever?

medium📝 component behavior Q5 of 15
LangChain - Conversational RAG
What happens if the memory store is empty when a query is made to a memory-augmented retriever?
AThe retriever calls the base retriever and stores the result in memory.
BThe retriever returns an empty list immediately.
CThe retriever throws an exception due to missing memory data.
DThe retriever skips the base retriever and returns cached data.
Step-by-Step Solution
Solution:

  1. Step 1: Understand initial memory state behavior

    If memory is empty, the retriever must fetch data from the base retriever.

  2. Step 2: Confirm memory update after retrieval

    After fetching, the result is stored in memory for future queries.

  3. Final Answer:

    The retriever calls the base retriever and stores the result in memory. -> Option A

  4. Quick Check:

    Empty memory triggers base retrieval and storage [OK]
Quick Trick: Empty memory triggers base retriever call [OK]
Common Mistakes:
  • Expecting empty results without retrieval
  • Assuming exceptions occur on empty memory
  • Thinking cached data is returned without base call

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