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9.5 Analysis of Evaluation for QA Source Code
As shown in Figure 9-4, let's take a look at the source code of the LangChain framework for Q&A evaluation (Evaluation for QA).

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Figure 9-5 LangChain's evaluation qa directory
In the eval_prompt.py file, three classes PromptTemplate are mainly defined, which are templates for generating questions.
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eval_prompt.py code implementation:

1.	# flake8: noqa
2.	from langchain.prompts import PromptTemplate
3.	
4.	template = """You are a teacher grading a quiz.
5.	You are given a question, the student's

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