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This template performs RAG using Milvus Vector Store and NVIDIA Models (Embedding and Chat).

Environment Setup​

You should export your NVIDIA API Key as an environment variable. If you do not have an NVIDIA API Key, you can create one by following these steps:

  1. Create a free account with the NVIDIA GPU Cloud service, which hosts AI solution catalogs, containers, models, etc.
  2. Navigate to Catalog > AI Foundation Models > (Model with API endpoint).
  3. Select the API option and click Generate Key.
  4. Save the generated key as NVIDIA_API_KEY. From there, you should have access to the endpoints.
export NVIDIA_API_KEY=...

For instructions on hosting the Milvus Vector Store, refer to the section at the bottom.


To use this package, you should first have the LangChain CLI installed:

pip install -U langchain-cli

To use the NVIDIA models, install the Langchain NVIDIA AI Endpoints package:

pip install -U langchain_nvidia_aiplay

To create a new LangChain project and install this as the only package, you can do:

langchain app new my-app --package nvidia-rag-canonical

If you want to add this to an existing project, you can just run:

langchain app add nvidia-rag-canonical

And add the following code to your file:

from nvidia_rag_canonical import chain as nvidia_rag_canonical_chain

add_routes(app, nvidia_rag_canonical_chain, path="/nvidia-rag-canonical")

If you want to set up an ingestion pipeline, you can add the following code to your file:

from nvidia_rag_canonical import ingest as nvidia_rag_ingest

add_routes(app, nvidia_rag_ingest, path="/nvidia-rag-ingest")

Note that for files ingested by the ingestion API, the server will need to be restarted for the newly ingested files to be accessible by the retriever.

(Optional) Let's now configure LangSmith. LangSmith will help us trace, monitor and debug LangChain applications. You can sign up for LangSmith here. If you don't have access, you can skip this section

export LANGCHAIN_API_KEY=<your-api-key>
export LANGCHAIN_PROJECT=<your-project> # if not specified, defaults to "default"

If you DO NOT already have a Milvus Vector Store you want to connect to, see Milvus Setup section below before proceeding.

If you DO have a Milvus Vector Store you want to connect to, edit the connection details in nvidia_rag_canonical/

If you are inside this directory, then you can spin up a LangServe instance directly by:

langchain serve

This will start the FastAPI app with a server is running locally at http://localhost:8000

We can see all templates at We can access the playground at

We can access the template from code with:

from langserve.client import RemoteRunnable

runnable = RemoteRunnable("http://localhost:8000/nvidia-rag-canonical")

Milvus Setup​

Use this step if you need to create a Milvus Vector Store and ingest data. We will first follow the standard Milvus setup instructions here.

  1. Download the Docker Compose YAML file.

    wget -O docker-compose.yml
  2. Start the Milvus Vector Store container

    sudo docker compose up -d
  3. Install the PyMilvus package to interact with the Milvus container.

    pip install pymilvus
  4. Let's now ingest some data! We can do that by moving into this directory and running the code in, eg:


    Note that you can (and should!) change this to ingest data of your choice.

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