本文向您展示如何使用 ChatGPT 和 LangChain API 来实际解析示例 PDF 文件。在本文中，我们PyCharm上编写 Python 代码作为执行环境，并调用 ChatGPT 和 LangChain 的 Python API。
Prompt: Polish and rewrite the above content to make it more in line with the style of academic papers， and at the same time， it can be more professional. If there are parts that do not conform to facts or logic， please refer to the part of xxxxx for the above content modification.
