Document extraction using LangChain and openai GPT

Here we see how to extract structured info from PDF document (Invoice) , very easily using LangChain Function Call and pydantic Data model, as well as how to create a Vector DB quickly and query a PDF Content.

[georgepetropoulos]

Hi, helpful tutorial, but I get an error when calling the chain.invoke("input": text), like following
TypeError: Completions.create() got an unexpected keyword argument 'functions'
Have you experienced that ever? Thanks