[Solved] Identify the error in this LangChain code snippet: from langchain import LLMChain, PromptTemplate prompt = PromptTemplate(template="What is {topic}?... | LangChain

LangChain - Fundamentals

Identify the error in this LangChain code snippet:

from langchain import LLMChain, PromptTemplate
prompt = PromptTemplate(template="What is {topic}?")
chain = LLMChain(prompt=prompt, llm=None)
result = chain.run(topic="Python")

APromptTemplate syntax is incorrect

BPassing None as llm causes a runtime error

CMissing import for LLM class

Drun() method requires no arguments

Step-by-Step Solution

Solution:

Step 1: Check the llm argument in LLMChain
Passing None as llm means no language model is provided, which is invalid.
Step 2: Predict the effect of None llm
Calling run() will cause a runtime error because the chain cannot generate output without an LLM.
Final Answer:
Passing None as llm causes a runtime error -> Option B
Quick Check:
llm=None causes error [OK]

Quick Trick: LLMChain needs a valid LLM, not None [OK]

Common Mistakes:

Assuming None is default LLM
Thinking prompt syntax is wrong
Believing run() takes no arguments

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More LangChain Quizzes

Identify the error in this LangChain code snippet:

Step 1: Check the llm argument in LLMChain

Step 2: Predict the effect of None llm

Final Answer:

Quick Check:

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