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163ef35dd1
Updated titles into a consistent format. Fixed links to the diagrams. Fixed typos. Note: The Templates menu in the navbar is now sorted by the file names. I'll try sorting the navbar menus by the page titles, not the page file names.
78 lines
2.3 KiB
Markdown
78 lines
2.3 KiB
Markdown
# RAG - AstraDB
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This template will perform RAG using `AstraDB` (`AstraDB` vector store class)
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## Environment Setup
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An [Astra DB](https://astra.datastax.com) database is required; free tier is fine.
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- You need the database **API endpoint** (such as `https://0123...-us-east1.apps.astra.datastax.com`) ...
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- ... and a **token** (`AstraCS:...`).
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Also, an **OpenAI API Key** is required. _Note that out-of-the-box this demo supports OpenAI only, unless you tinker with the code._
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Provide the connection parameters and secrets through environment variables. Please refer to `.env.template` for the variable names.
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## Usage
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To use this package, you should first have the LangChain CLI installed:
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```shell
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pip install -U "langchain-cli[serve]"
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```
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To create a new LangChain project and install this as the only package, you can do:
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```shell
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langchain app new my-app --package rag-astradb
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```
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If you want to add this to an existing project, you can just run:
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```shell
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langchain app add rag-astradb
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```
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And add the following code to your `server.py` file:
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```python
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from astradb_entomology_rag import chain as astradb_entomology_rag_chain
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add_routes(app, astradb_entomology_rag_chain, path="/rag-astradb")
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```
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(Optional) Let's now configure LangSmith.
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LangSmith will help us trace, monitor and debug LangChain applications.
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You can sign up for LangSmith [here](https://smith.langchain.com/).
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If you don't have access, you can skip this section
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```shell
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export LANGCHAIN_TRACING_V2=true
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export LANGCHAIN_API_KEY=<your-api-key>
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export LANGCHAIN_PROJECT=<your-project> # if not specified, defaults to "default"
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```
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If you are inside this directory, then you can spin up a LangServe instance directly by:
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```shell
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langchain serve
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```
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This will start the FastAPI app with a server is running locally at
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[http://localhost:8000](http://localhost:8000)
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We can see all templates at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs)
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We can access the playground at [http://127.0.0.1:8000/rag-astradb/playground](http://127.0.0.1:8000/rag-astradb/playground)
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We can access the template from code with:
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```python
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from langserve.client import RemoteRunnable
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runnable = RemoteRunnable("http://localhost:8000/rag-astradb")
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```
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## Reference
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Stand-alone repo with LangServe chain: [here](https://github.com/hemidactylus/langserve_astradb_entomology_rag).
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