[Error from using ChromaDB]

Core Problem

When using the ChromaDB library in LangChain, an unexpected ValueError is raised with the message "Could not connect to tenant default_tenant. Are you sure it exists?"

Solution & Analysis

To resolve this issue, we need to ensure that the ChromaDB tenant exists and is correctly configured.

import os
from langchain.chains import create_history_aware_retriever, create_retrieval_chain
from langchain.chroma import Chroma

It appears that the problem lies in the persist_directory parameter. If this directory does not exist or is not accessible, the connection to ChromaDB fails.

vector_store = Chroma(
    collection_name="example_collection",
    embedding_function=embeddings,
    persist_directory="./chroma_langchain_db"  # Where to save data locally, remove if not neccesary
)

To fix this issue:

Ensure that the persist_directory exists and is accessible.
Update the directory path or ensure it's correct.

vector_store = Chroma(
    collection_name="example_collection",
    embedding_function=embeddings,
    persist_directory="/path/to/chroma_langchain_db"  # Corrected directory path
)

Conclusion

By ensuring that the persist_directory exists and is correctly configured, we can resolve the ValueError caused by ChromaDB.

Reference

Source