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Chroma is a database for building AI applications with embeddings.

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Installation and Setup

pip install langchain-chroma

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VectorStore

There exists a wrapper around Chroma vector databases, allowing you to use it as a vectorstore, whether for semantic search or example selection. 
from langchain_chroma import Chroma
For a more detailed walkthrough of the Chroma wrapper, see this notebook

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Retriever

See a usage example. 
from langchain.retrievers import SelfQueryRetriever