Let’s say we want to QA a research paper. Since we can’t fit the entire paper into GPT, we need a way to break this paper down into smaller chunks. By default Berri provides custom chunking, but we can also write our own. Writing your own chunking strategy is a good way of improving the quality of our responses (since we’re answering user questions based on the most relevant chunk we find). Relevant Links:
  1. Link to code
  2. Link to playground

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Step 1: Set up your environment

For this tutorial we’re going to use a sample ML research paper as our initial data source. 
!pip install gdown
!gdown 1g-RBkhExWOsNJ17IBOQmv-4owaV5nH1X
!pip install PyPDF2
import json
import requests

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Step 2: Customize chunking

In this case, let’s make every page a chunk (i.e. the thing we feed into GPT). 
import PyPDF2
text_list = []
with open("./ml_paper.pdf", "rb") as fp:
    # Create a PDF object
    pdf = PyPDF2.PdfReader(fp)

    # Get the number of pages in the PDF document
    num_pages = len(pdf.pages)

    # Iterate over every page
    for page in range(num_pages):
        # Extract the text from the page
        page_text = pdf.pages[page].extract_text()
        text_list.append(page_text) # chunk by page
Here we’re using our own data loader (PyPDF2), extracting the text from the page, and adding that to text_list.

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Step 3: Creating a custom chatGPT instance to QA against our Doc

Since we’ve stored our chunks as a list (text_list), let’s pass that to Berri. 
url = "https://api.berri.ai/create_app"
data = {"user_email": <your_email>, "data_source": json.dumps(text_list)}
response = requests.post(url, data=data)
response.text

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Step 4: Testing our instance in playground

Each instance has it’s own unique playground link. This is a place for you to test your model and quickly make any changes (e.g. updating prompt, etc.) 
playground_endpoint = response.json()["playground_endpoint"]