Complete code

Here is the code in its entirety:

%pip install langchain_community
%pip install langchain_experimental
%pip install langchain-openai
%pip install langchainhub
%pip install chromadb
%pip install langchain
%pip install beautifulsoup4

Restart the kernel before running the following code:

import os
from langchain_community.document_loaders import WebBaseLoader
import bs4
import openai
from langchain_openai import ChatOpenAI, OpenAIEmbeddings
from langchain import hub
from langchain_core.output_parsers import StrOutputParser
from langchain_core.runnables import RunnablePassthrough
import chromadb
from langchain_community.vectorstores import Chroma
from langchain_experimental.text_splitter import SemanticChunker
os.environ['OPENAI_API_KEY'] = 'sk-###################'
openai.api_key = os.environ['OPENAI_API_KEY']
#### INDEXING ####
loader = WebBaseLoader(
    web_paths=("https://kbourne.github.io/chapter1.html&quot...