This notebook shows how to use functionality related to the Marqo vectorstore.
Marqo is an open-source vector search engine. Marqo allows you to store and query multi-modal data such as text and images. Marqo creates the vectors for you using a huge selection of open-source models, you can also provide your own fine-tuned models and Marqo will handle the loading and inference for you.
You’ll need to install langchain-community with pip install -qU langchain-community to use this integration To run this notebook with our docker image please run the following commands first to get Marqo: 
docker pull marqoai/marqo:latest
docker rm -f marqo
docker run --name marqo -it --privileged -p 8882:8882 --add-host host.docker.internal:host-gateway marqoai/marqo:latest

%pip install -qU  marqo

from langchain_community.document_loaders import TextLoader
from langchain_community.vectorstores import Marqo
from langchain_text_splitters import CharacterTextSplitter

from langchain_community.document_loaders import TextLoader

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)

import marqo

# initialize marqo
marqo_url = "http://localhost:8882"  # if using marqo cloud replace with your endpoint (console.marqo.ai)
marqo_api_key = ""  # if using marqo cloud replace with your api key (console.marqo.ai)

client = marqo.Client(url=marqo_url, api_key=marqo_api_key)

index_name = "langchain-demo"

docsearch = Marqo.from_documents(docs, index_name=index_name)

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

Index langchain-demo exists.

print(result_docs[0].page_content)

Tonight. I call on the Senate to: Pass the Freedom to Vote Act. Pass the John Lewis Voting Rights Act. And while you’re at it, pass the Disclose Act so Americans can know who is funding our elections.

Tonight, I’d like to honor someone who has dedicated his life to serve this country: Justice Stephen Breyer—an Army veteran, Constitutional scholar, and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service.

One of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court.

And I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nation’s top legal minds, who will continue Justice Breyer’s legacy of excellence.

result_docs = docsearch.similarity_search_with_score(query)
print(result_docs[0][0].page_content, result_docs[0][1], sep="\n")

Tonight. I call on the Senate to: Pass the Freedom to Vote Act. Pass the John Lewis Voting Rights Act. And while you’re at it, pass the Disclose Act so Americans can know who is funding our elections.

Tonight, I’d like to honor someone who has dedicated his life to serve this country: Justice Stephen Breyer—an Army veteran, Constitutional scholar, and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service.

One of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court.

And I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nation’s top legal minds, who will continue Justice Breyer’s legacy of excellence.
0.68647254

​
Additional features

One of the powerful features of Marqo as a vectorstore is that you can use indexes created externally. For example:
  • If you had a database of image and text pairs from another application, you can simply just use it in langchain with the Marqo vectorstore. Note that bringing your own multimodal indexes will disable the add_texts method.
  • If you had a database of text documents, you can bring it into the langchain framework and add more texts through add_texts.
The documents that are returned are customised by passing your own function to the page_content_builder callback in the search methods.

​
Multimodal Example

# use a new index
index_name = "langchain-multimodal-demo"

# incase the demo is re-run
try:
    client.delete_index(index_name)
except Exception:
    print(f"Creating {index_name}")

# This index could have been created by another system
settings = {"treat_urls_and_pointers_as_images": True, "model": "ViT-L/14"}
client.create_index(index_name, **settings)
client.index(index_name).add_documents(
    [
        # image of a bus
        {
            "caption": "Bus",
            "image": "https://raw.githubusercontent.com/marqo-ai/marqo/mainline/examples/ImageSearchGuide/data/image4.jpg",
        },
        # image of a plane
        {
            "caption": "Plane",
            "image": "https://raw.githubusercontent.com/marqo-ai/marqo/mainline/examples/ImageSearchGuide/data/image2.jpg",
        },
    ],
)

{'errors': False,
 'processingTimeMs': 2090.2822139996715,
 'index_name': 'langchain-multimodal-demo',
 'items': [{'_id': 'aa92fc1c-1fb2-4d86-b027-feb507c419f7',
   'result': 'created',
   'status': 201},
  {'_id': '5142c258-ef9f-4bf2-a1a6-2307280173a0',
   'result': 'created',
   'status': 201}]}

def get_content(res):
    """Helper to format Marqo's documents into text to be used as page_content"""
    return f"{res['caption']}: {res['image']}"


docsearch = Marqo(client, index_name, page_content_builder=get_content)


query = "vehicles that fly"
doc_results = docsearch.similarity_search(query)

for doc in doc_results:
    print(doc.page_content)

Plane: https://raw.githubusercontent.com/marqo-ai/marqo/mainline/examples/ImageSearchGuide/data/image2.jpg
Bus: https://raw.githubusercontent.com/marqo-ai/marqo/mainline/examples/ImageSearchGuide/data/image4.jpg

​
Text only example

# use a new index
index_name = "langchain-byo-index-demo"

# incase the demo is re-run
try:
    client.delete_index(index_name)
except Exception:
    print(f"Creating {index_name}")

# This index could have been created by another system
client.create_index(index_name)
client.index(index_name).add_documents(
    [
        {
            "Title": "Smartphone",
            "Description": "A smartphone is a portable computer device that combines mobile telephone "
            "functions and computing functions into one unit.",
        },
        {
            "Title": "Telephone",
            "Description": "A telephone is a telecommunications device that permits two or more users to"
            "conduct a conversation when they are too far apart to be easily heard directly.",
        },
    ],
)

{'errors': False,
 'processingTimeMs': 139.2144540004665,
 'index_name': 'langchain-byo-index-demo',
 'items': [{'_id': '27c05a1c-b8a9-49a5-ae73-fbf1eb51dc3f',
   'result': 'created',
   'status': 201},
  {'_id': '6889afe0-e600-43c1-aa3b-1d91bf6db274',
   'result': 'created',
   'status': 201}]}

# Note text indexes retain the ability to use add_texts despite different field names in documents
# this is because the page_content_builder callback lets you handle these document fields as required


def get_content(res):
    """Helper to format Marqo's documents into text to be used as page_content"""
    if "text" in res:
        return res["text"]
    return res["Description"]


docsearch = Marqo(client, index_name, page_content_builder=get_content)

docsearch.add_texts(["This is a document that is about elephants"])

['9986cc72-adcd-4080-9d74-265c173a9ec3']

query = "modern communications devices"
doc_results = docsearch.similarity_search(query)

print(doc_results[0].page_content)

A smartphone is a portable computer device that combines mobile telephone functions and computing functions into one unit.

query = "elephants"
doc_results = docsearch.similarity_search(query, page_content_builder=get_content)

print(doc_results[0].page_content)

This is a document that is about elephants

​
Weighted Queries

We also expose marqos weighted queries which are a powerful way to compose complex semantic searches. 
query = {"communications devices": 1.0}
doc_results = docsearch.similarity_search(query)
print(doc_results[0].page_content)

A smartphone is a portable computer device that combines mobile telephone functions and computing functions into one unit.

query = {"communications devices": 1.0, "technology post 2000": -1.0}
doc_results = docsearch.similarity_search(query)
print(doc_results[0].page_content)

A telephone is a telecommunications device that permits two or more users toconduct a conversation when they are too far apart to be easily heard directly.

​
Question Answering with Sources

This section shows how to use Marqo as part of a RetrievalQAWithSourcesChain. Marqo will perform the searches for information in the sources. 
import getpass
import os

from langchain.chains import RetrievalQAWithSourcesChain
from langchain_openai import OpenAI

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

OpenAI API Key:········

with open("../../how_to/state_of_the_union.txt") as f:
    state_of_the_union = f.read()
text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)
texts = text_splitter.split_text(state_of_the_union)

index_name = "langchain-qa-with-retrieval"
docsearch = Marqo.from_documents(docs, index_name=index_name)

Index langchain-qa-with-retrieval exists.

chain = RetrievalQAWithSourcesChain.from_chain_type(
    OpenAI(temperature=0), chain_type="stuff", retriever=docsearch.as_retriever()
)

chain(
    {"question": "What did the president say about Justice Breyer"},
    return_only_outputs=True,
)

{'answer': ' The president honored Justice Breyer, thanking him for his service and noting that he is a retiring Justice of the United States Supreme Court.\n',
 'sources': '../../../state_of_the_union.txt'}