Bird
0
0

Identify the error in this Langchain RAG snippet that tries to include conversation history: ```python history = ["User: What is AI?", "Assistant: AI is...] query = "Explain RAG." full_query = query + history docs = retriever.get_relevant_documents(full_query) ```

medium📝 Debug Q6 of 15
LangChain - Conversational RAG
Identify the error in this Langchain RAG snippet that tries to include conversation history: ```python history = ["User: What is AI?", "Assistant: AI is...] query = "Explain RAG." full_query = query + history docs = retriever.get_relevant_documents(full_query) ```
AThe variable 'history' is not defined.
BThe retriever does not accept queries longer than one word.
CCannot concatenate string and list directly; must join history into a string first.
DThe code is correct and will run without errors.
Step-by-Step Solution
Solution:

  1. Step 1: Check data types in concatenation

    The code tries to add a string and a list directly, which causes a TypeError in Python.

  2. Step 2: Correct approach

    History should be joined into a single string before concatenation, e.g., ' '.join(history).

  3. Final Answer:

    Cannot concatenate string and list directly; must join history into a string first. -> Option C

  4. Quick Check:

    String + list concat error = A [OK]
Quick Trick: Join list to string before concatenation [OK]
Common Mistakes:
  • Trying to add string and list directly
  • Assuming retriever limits query length
  • Ignoring variable definition

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More LangChain Quizzes
Conversational RAG - Memory-augmented retrieval - Quiz 7medium Conversational RAG - Handling follow-up questions - Quiz 15hard Embeddings and Vector Stores - OpenAI embeddings - Quiz 11easy Embeddings and Vector Stores - OpenAI embeddings - Quiz 7medium RAG Chain Construction - Contextual compression - Quiz 8hard RAG Chain Construction - Context formatting and injection - Quiz 11easy Text Splitting - Why chunk size affects retrieval quality - Quiz 4medium Text Splitting - Metadata preservation during splitting - Quiz 8hard Text Splitting - Semantic chunking strategies - Quiz 3easy Text Splitting - Code-aware text splitting - Quiz 3easy