Multi-query retrieval for better recall in LangChain - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the MultiQueryRetriever class from langchain.

LangChain

from langchain.retrievers import [1]

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AMultiQueryRetriever

BBaseRetriever

CVectorStoreRetriever

DSimpleRetriever

Attempts:

3 left

💡 Hint

Common Mistakes

Importing a wrong retriever class like BaseRetriever or SimpleRetriever.

Forgetting to import from the retrievers submodule.

The MultiQueryRetriever class is imported from langchain.retrievers to enable multi-query retrieval.

2fill in blank

medium

Complete the code to create a MultiQueryRetriever with two queries.

LangChain

retriever = MultiQueryRetriever(
    retrievers=[
        retriever1,
        retriever2
    ],
    queries=[[1]]
)

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A['How to code?']

B['AI', 'ML']

C['What is AI?', 'Explain machine learning']

D['Query1', 'Query2', 'Query3']

Attempts:

3 left

💡 Hint

Common Mistakes

Providing too few or too many queries.

Using short keywords instead of full questions.

The queries parameter expects a list of meaningful questions to improve recall. Here, two clear queries are provided.

3fill in blank

hard

Fix the error in the code to correctly retrieve documents using MultiQueryRetriever.

LangChain

docs = retriever.[1]('Explain AI and ML')

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Afetch

Bsearch

Cretrieve_docs

Dget_documents

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like 'fetch' or 'search'.

Confusing method names from other libraries.

The correct method to get documents from a retriever is get_documents. Other method names will cause errors.

4fill in blank

hard

Fill both blanks to create a MultiQueryRetriever that combines two retrievers and uses two queries.

LangChain

retriever = MultiQueryRetriever(
    retrievers=[[1], [2]],
    queries=['What is AI?', 'What is NLP?']
)

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Aretriever_a

Bretriever_b

Cretriever_c

Dretriever_d

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same retriever twice.

Using undefined retriever variable names.

To combine two retrievers, you list them inside the retrievers parameter. Here, retriever_a and retriever_b are used.

5fill in blank

hard

Fill all three blanks to create a MultiQueryRetriever, run a query, and print the number of documents retrieved.

LangChain

retriever = MultiQueryRetriever(
    retrievers=[[1], [2]],
    queries=['Define AI', 'Define ML']
)
docs = retriever.[3]('Define AI and ML')
print(len(docs))

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Aretriever_x

Bretriever_y

Cget_documents

Dretriever_z

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names for retrieval.

Using undefined retriever variables.

The retrievers retriever_x and retriever_y are combined. The method get_documents is called to retrieve documents, then their count is printed.