# Data query example
This example makes use of [langchain and chroma ](https://blog.langchain.dev/langchain-chroma/ ) to enable question answering on a set of documents.
## Setup
Download the models and start the API:
```bash
# Clone LocalAI
git clone https://github.com/go-skynet/LocalAI
cd LocalAI/examples/langchain-chroma
wget https://huggingface.co/skeskinen/ggml/resolve/main/all-MiniLM-L6-v2/ggml-model-q4_0.bin -O models/bert
wget https://gpt4all.io/models/ggml-gpt4all-j.bin -O models/ggml-gpt4all-j
# configure your .env
# NOTE: ensure that THREADS does not exceed your machine's CPU cores
mv .env.example .env
# start with docker-compose
docker-compose up -d --build
# tail the logs & wait until the build completes
docker logs -f langchain-chroma-api-1
```
### Python requirements
```
pip install -r requirements.txt
```
### Create a storage
In this step we will create a local vector database from our document set, so later we can ask questions on it with the LLM.
Note: **OPENAI_API_KEY** is not required. However the library might fail if no API_KEY is passed by, so an arbitrary string can be used.
```bash
export OPENAI_API_BASE=http://localhost:8080/v1
export OPENAI_API_KEY=sk-
wget https://raw.githubusercontent.com/hwchase17/chat-your-data/master/state_of_the_union.txt
python store.py
```
After it finishes, a directory "db" will be created with the vector index database.
## Query
We can now query the dataset.
```bash
export OPENAI_API_BASE=http://localhost:8080/v1
export OPENAI_API_KEY=sk-
python query.py
# President Trump recently stated during a press conference regarding tax reform legislation that "we're getting rid of all these loopholes." He also mentioned that he wants to simplify the system further through changes such as increasing the standard deduction amount and making other adjustments aimed at reducing taxpayers' overall burden.
```
Keep in mind now things are hit or miss!
