problems running ml backend with data from localhost

Hi there. I am new to label-studio-ml, just started using the tool today. I am trying to run the example [mmdetection](https://github.com/heartexlabs/label-studio-ml-backend/tree/d6e72f9e9b48129173df16a8ee5dc4a148f30f5c/label_studio_ml/examples/mmdetection), and have run into a problem trying to run the model on the backend of label-studio running through my localhost. I have uploaded an image manually to labelstudio, and added the model from http://localhost:9091. When I go to run the automated labelling, I get the following traceback from label-studio:

```bash
[24/Aug/2022 22:53:50] "GET /data/upload/2/6c449796-0032078421520747-1657602370819-20220712-360-n1yNFk_left.jpg HTTP/1.1" 200 2083378
[2022-08-24 22:53:51,751] [ml.models::predict_tasks::171] [WARNING] Prediction not created for project (id=1, url=http://localhost:9091): 500 Server Error: INTERNAL SERVER ERROR for url: http://localhost:9091/predict
```

To confirm that it was the request that was having problems, I ran the following from inside the server docker container:

```python
requests.get('http://localhost:8083/data/upload/1/d2f932ea-0032078421520747-1657602370819-20220712-360-E-IfNo_right.jpg')
```

Traceback:
```bash
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python3.7/site-packages/requests/api.py", line 73, in get
return request("get", url, params=params, **kwargs)
File "/usr/local/lib/python3.7/site-packages/requests/api.py", line 59, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 587, in request
resp = self.send(prep, **send_kwargs)
File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 701, in send
r = adapter.send(request, **kwargs)
File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 565, in send
raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=8083): Max retries exceeded with url: /data/upload/1/d2f932ea-0032078421520747-1657602370819-20220712-360-E-IfNo_right.jpg (Caused by NewConnectionError(': Failed to establish a new connection: [Errno 111] Connection refused'))
```

And also ran the following (I landed on 172.17.0.1 from [this link](https://forums.docker.com/t/how-to-reach-localhost-on-host-from-docker-container/113321/2)):

```python
requests.get('http://172.17.0.1:8083/data/upload/1/d2f932ea-0032078421520747-1657602370819-20220712-360-E-IfNo_right.jpg')
```
which returned the following request:
```bash
b'{"id":"99370e89-a4b3-456e-87ff-d278c9b6021d","status_code":401,"version":"1.5.0post0","detail":"Authentication credentials were not provided.","exc_info":null}'
```

In order to solve this issue, I have added the following to the docker-compose.yml:

```yml
extra_hosts:
- "localhost:172.17.0.1"
```

I'm not sure if this is the best solution, but it solved the problem for me