GenAI Stack

This GenAI application stack will get you started building your own GenAI application in no time. The demo applications can serve as inspiration or as a starting point. Learn more about the details in the technical blog post.

Configure

Create a .env file from the environment template file env.example

Available variables:

Variable Name	Default value	Description
OLLAMA_BASE_URL	http://host.docker.internal:11434	REQUIRED - URL to Ollama LLM API
NEO4J_URI	neo4j://database:7687	REQUIRED - URL to Neo4j database
NEO4J_USERNAME	neo4j	REQUIRED - Username for Neo4j database
NEO4J_PASSWORD	password	REQUIRED - Password for Neo4j database
LLM	llama2	REQUIRED - Can be any Ollama model tag, or gpt-4 or gpt-3.5 or claudev2
EMBEDDING_MODEL	sentence_transformer	REQUIRED - Can be sentence_transformer, openai, aws or ollama
AWS_ACCESS_KEY_ID		REQUIRED - Only if LLM=claudev2 or embedding_model=aws
AWS_SECRET_ACCESS_KEY		REQUIRED - Only if LLM=claudev2 or embedding_model=aws
AWS_DEFAULT_REGION		REQUIRED - Only if LLM=claudev2 or embedding_model=aws
OPENAI_API_KEY		REQUIRED - Only if LLM=gpt-4 or LLM=gpt-3.5 or embedding_model=openai
LANGCHAIN_ENDPOINT	"https://api.smith.langchain.com"	OPTIONAL - URL to Langchain Smith API
LANGCHAIN_TRACING_V2	false	OPTIONAL - Enable Langchain tracing v2
LANGCHAIN_PROJECT		OPTIONAL - Langchain project name
LANGCHAIN_API_KEY		OPTIONAL - Langchain API key

LLM Configuration

MacOS and Linux users can use any LLM that's available via Ollama. Check the "tags" section under the model page you want to use on https://ollama.ai/library and write the tag for the value of the environment variable LLM= in th e.env file. All platforms can use GPT-3.5-turbo and GPT-4 (bring your own API keys for OpenAIs models).

MacOS Install Ollama on MacOS and start it before running docker compose up.

Linux No need to install Ollama manually, it will run in a container as part of the stack when running with the Linux profile: run docker compose --profile linux up. Make sure to set the OLLAMA_BASE_URL=http://llm:11434 in the .env file when using Ollama docker container.

Windows Not supported by Ollama, so Windows users need to generate a OpenAI API key and configure the stack to use gpt-3.5 or gpt-4 in the .env file.

Develop

Warning

There is a performance issue that impacts python applications in the latest release of Docker Desktop. Until a fix is available, please use version 4.23.0 or earlier.

To start everything

docker compose up

If changes to build scripts has been made, rebuild.

docker compose up --build

To enter watch mode (auto rebuild on file changes). First start everything, then in new terminal:

docker compose alpha watch

Shutdown If health check fails or containers don't start up as expected, shutdown completely to start up again.

docker compose down

Applications

Here's what's in this repo:

Name	Main files	Compose name	URLs	Description
Support Bot	bot.py	bot	http://localhost:8501	Main usecase. Fullstack Python application.
Stack Overflow Loader	loader.py	loader	http://localhost:8502	Load SO data into the database (create vector embeddings etc). Fullstack Python application.
PDF Reader	pdf_bot.py	pdf_bot	http://localhost:8503	Read local PDF and ask it questions. Fullstack Python application.
Standalone Bot API	api.py	api	http://localhost:8504	Standalone HTTP API streaming (SSE) + non-streaming endpoints. Python.
Standalone Bot UI	front-end/	front-end	http://localhost:8505	Standalone client that uses the Standalone Bot API to interact with the model. JavaScript (Svelte) front-end.

The database can be explored at http://localhost:7474.

App 1 - Support Agent Bot

UI: http://localhost:8501 DB client: http://localhost:7474

• answer support question based on recent entries
• provide summarized answers with sources
• demonstrate difference between
  • RAG Disabled (pure LLM response)
  • RAG Enabled (vector + knowledge graph context)
• allow to generate a high quality support ticket for the current conversation based on the style of highly rated questions in the database.

(Chat input + RAG mode selector)

(CTA to auto generate support ticket draft)	(UI of the auto generated support ticket draft)

---

App 2 - Loader

UI: http://localhost:8502 DB client: http://localhost:7474

• import recent Stack Overflow data for certain tags into a KG
• embed questions and answers and store in vector index
• UI: choose tags, run import, see progress, some stats of data in the database
• Load high ranked questions (regardless of tags) to support the ticket generation feature of App 1.

App 3 Question / Answer with a local PDF

UI: http://localhost:8503
DB client: http://localhost:7474

This application lets you load a local PDF into text chunks and embed it into Neo4j so you can ask questions about its contents and have the LLM answer them using vector similarity search.

App 4 Standalone HTTP API

Endpoints:

• http://localhost:8504/query?text=hello&rag=false (non streaming)
• http://localhost:8504/query-stream?text=hello&rag=false (SSE streaming)

Example cURL command:

curl http://localhost:8504/query-stream\?text\=minimal%20hello%20world%20in%20python\&rag\=false

Exposes the functionality to answer questions in the same way as App 1 above. Uses same code and prompts.

App 5 Static front-end

UI: http://localhost:8505

This application has the same features as App 1, but is built separate from the back-end code using modern best practices (Vite, Svelte, Tailwind).
The auto-reload on changes are instant using the Docker watch sync config.