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You wrote this code to perform MMR retrieval but get an error:

medium📝 Debug Q14 of 15
LangChain - Embeddings and Vector Stores
You wrote this code to perform MMR retrieval but get an error: 
mmr = MMRRetriever(documents, k=3, lambda_mult=0.6)
results = mmr.get_relevant_documents(query)
What is the likely cause of the error?
ACalling 'get_relevant_documents' instead of 'retrieve_documents'.
BUsing 'k' instead of 'top_k' when initializing MMRRetriever.
CMissing import statement for MMRRetriever.
DUsing 'lambda_mult' instead of 'lambda' parameter.
Step-by-Step Solution
Solution:

  1. Step 1: Check parameter names in MMRRetriever initialization

    The parameters k and lambda_mult are correct.

  2. Step 2: Confirm method name correctness

    get_relevant_documents is a valid method for retrievers.

  3. Final Answer:

    Missing import statement for MMRRetriever. -> Option C

  4. Quick Check:

    Missing import = NameError [OK]
Quick Trick: Import MMRRetriever before use [OK]
Common Mistakes:
  • Forgetting import statement for MMRRetriever
  • Confusing method names
  • Wrong parameter names like top_k or lambda

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