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Typesense is an open-source, in-memory search engine, that you can either self-host or run on Typesense Cloud. Typesense focuses on performance by storing the entire index in RAM (with a backup on disk) and also focuses on providing an out-of-the-box developer experience by simplifying available options and setting good defaults. It also lets you combine attribute-based filtering together with vector queries, to fetch the most relevant documents.
This notebook shows you how to use Typesense as your VectorStore. Let’s first install our dependencies: 
pip install -qU  typesense openapi-schema-pydantic langchain-openai langchain-community tiktoken
We want to use OpenAIEmbeddings so we have to get the OpenAI API Key. 
import getpass
import os

if "OPENAI_API_KEY" not in os.environ:
    os.environ["OPENAI_API_KEY"] = getpass.getpass("OpenAI API Key:")

from langchain_community.document_loaders import TextLoader
from langchain_community.vectorstores import Typesense
from langchain_openai import OpenAIEmbeddings
from langchain_text_splitters import CharacterTextSplitter
Let’s import our test dataset: 
loader = TextLoader("../../how_to/state_of_the_union.txt")
documents = loader.load()
text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)
docs = text_splitter.split_documents(documents)

embeddings = OpenAIEmbeddings()

docsearch = Typesense.from_documents(
    docs,
    embeddings,
    typesense_client_params={
        "host": "localhost",  # Use xxx.a1.typesense.net for Typesense Cloud
        "port": "8108",  # Use 443 for Typesense Cloud
        "protocol": "http",  # Use https for Typesense Cloud
        "typesense_api_key": "xyz",
        "typesense_collection_name": "lang-chain",
    },
)

query = "What did the president say about Ketanji Brown Jackson"
found_docs = docsearch.similarity_search(query)

print(found_docs[0].page_content)

​
Typesense as a Retriever

Typesense, as all the other vector stores, is a LangChain Retriever, by using cosine similarity. 
retriever = docsearch.as_retriever()
retriever

query = "What did the president say about Ketanji Brown Jackson"
retriever.invoke(query)[0]
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