docs/12 - OpenAI API.md

## OpenAI compatible API

The main API for this project is meant to be a drop-in replacement to the OpenAI API, including Chat and Completions endpoints. 

* It is 100% offline and private.
* It doesn't create any logs.
* It doesn't connect to OpenAI.
* It doesn't use the openai-python library.

If you did not use the one-click installers, you may need to install the requirements first:

```
pip install -r extensions/openai/requirements.txt
```

### Starting the API

Add `--api` to your command-line flags.

* To create a public Cloudflare URL, add the `--public-api` flag.
* To listen on your local network, add the `--listen` flag.
* To change the port, which is 5000 by default, use `--api-port 1234` (change 1234 to your desired port number).
* To use SSL, add `--ssl-keyfile key.pem --ssl-certfile cert.pem`. Note that it doesn't work with `--public-api`.
* To use an API key for authentication, add `--api-key yourkey`.

### Examples

For the documentation with all the parameters and their types, consult `http://127.0.0.1:5000/docs` or the [typing.py](https://github.com/oobabooga/text-generation-webui/blob/main/extensions/openai/typing.py) file.

The official examples in the [OpenAI documentation](https://platform.openai.com/docs/api-reference) should also work, and the same parameters apply (although the API here has more optional parameters).

#### Completions

```shell
curl http://127.0.0.1:5000/v1/completions \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "This is a cake recipe:\n\n1.",
    "max_tokens": 200,
    "temperature": 1,
    "top_p": 0.9,
    "seed": 10
  }'
```

#### Chat completions

Works best with instruction-following models. If the "instruction_template" variable is not provided, it will be guessed automatically based on the model name using the regex patterns in `models/config.yaml`.

```shell
curl http://127.0.0.1:5000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "mode": "instruct",
    "instruction_template": "Alpaca"
  }'
```

#### Chat completions with characters

```shell
curl http://127.0.0.1:5000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "messages": [
      {
        "role": "user",
        "content": "Hello! Who are you?"
      }
    ],
    "mode": "chat",
    "character": "Example"
  }'
```

#### SSE streaming

```shell
curl http://127.0.0.1:5000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "mode": "instruct",
    "instruction_template": "Alpaca",
    "stream": true
  }'
```

#### Logits

```shell
curl -k http://127.0.0.1:5000/v1/internal/logits \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "Who is best, Asuka or Rei? Answer:",
    "use_samplers": false
  }'
```

#### Logits after sampling parameters

```shell
curl -k http://127.0.0.1:5000/v1/internal/logits \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "Who is best, Asuka or Rei? Answer:",
    "use_samplers": true,
    "top_k": 3
  }'
```

#### Python chat example

```python
import requests

url = "http://127.0.0.1:5000/v1/chat/completions"

headers = {
    "Content-Type": "application/json"
}

history = []

while True:
    user_message = input("> ")
    history.append({"role": "user", "content": user_message})
    data = {
        "mode": "chat",
        "character": "Example",
        "messages": history
    }

    response = requests.post(url, headers=headers, json=data, verify=False)
    assistant_message = response.json()['choices'][0]['message']['content']
    history.append({"role": "assistant", "content": assistant_message})
    print(assistant_message)
```

#### Python chat example with streaming

Start the script with `python -u` to see the output in real time.

```python
import requests
import sseclient  # pip install sseclient-py
import json

url = "http://127.0.0.1:5000/v1/chat/completions"

headers = {
    "Content-Type": "application/json"
}

history = []

while True:
    user_message = input("> ")
    history.append({"role": "user", "content": user_message})
    data = {
        "mode": "instruct",
        "stream": True,
        "messages": history
    }

    stream_response = requests.post(url, headers=headers, json=data, verify=False, stream=True)
    client = sseclient.SSEClient(stream_response)

    assistant_message = ''
    for event in client.events():
        payload = json.loads(event.data)
        chunk = payload['choices'][0]['message']['content']
        assistant_message += chunk
        print(chunk, end='')

    print()
    history.append({"role": "assistant", "content": assistant_message})
```

#### Python completions example with streaming

Start the script with `python -u` to see the output in real time.

```python
import json
import requests
import sseclient  # pip install sseclient-py

url = "http://127.0.0.1:5000/v1/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
    "prompt": "This is a cake recipe:\n\n1.",
    "max_tokens": 200,
    "temperature": 1,
    "top_p": 0.9,
    "seed": 10,
    "stream": True,
}

stream_response = requests.post(url, headers=headers, json=data, verify=False, stream=True)
client = sseclient.SSEClient(stream_response)

print(data['prompt'], end='')
for event in client.events():
    payload = json.loads(event.data)
    print(payload['choices'][0]['text'], end='')

print()
```

### Environment variables

The following environment variables can be used (they take precendence over everything else):

| Variable Name          | Description                                                                                        | Example Value              |
|------------------------|------------------------------------|----------------------------|
| `OPENEDAI_PORT`           | Port number         |             5000               |
| `OPENEDAI_CERT_PATH`      | SSL certificate file path         |            cert.pem                |
| `OPENEDAI_KEY_PATH`       | SSL key file path                    |             key.pem               |
| `OPENEDAI_DEBUG`          | Enable debugging (set to 1)    | 1                          |
| `SD_WEBUI_URL`           | WebUI URL (used by endpoint) | http://127.0.0.1:7861 |
| `OPENEDAI_EMBEDDING_MODEL` | Embedding model (if applicable) |          sentence-transformers/all-mpnet-base-v2                  |
| `OPENEDAI_EMBEDDING_DEVICE` | Embedding device (if applicable) |           cuda                 |

#### Persistent settings with `settings.yaml`

You can also set the following variables in your `settings.yaml` file:

```
openai-embedding_device: cuda
openai-embedding_model: "sentence-transformers/all-mpnet-base-v2"
openai-sd_webui_url: http://127.0.0.1:7861
openai-debug: 1
```

### Third-party application setup

You can usually force an application that uses the OpenAI API to connect to the local API by using the following environment variables:

```shell
OPENAI_API_HOST=http://127.0.0.1:5000
```

or

```shell
OPENAI_API_KEY=sk-111111111111111111111111111111111111111111111111
OPENAI_API_BASE=http://127.0.0.1:5000/v1
```

With the [official python openai client](https://github.com/openai/openai-python), the address can be set like this:

```python
import openai

openai.api_key = "..."
openai.api_base = "http://127.0.0.1:5000/v1"
openai.api_version = "2023-05-15"
```

If using .env files to save the `OPENAI_API_BASE` and `OPENAI_API_KEY` variables, make sure the .env file is loaded before the openai module is imported:

```python
from dotenv import load_dotenv
load_dotenv() # make sure the environment variables are set before import
import openai
```

With the [official Node.js openai client](https://github.com/openai/openai-node) it is slightly more more complex because the environment variables are not used by default, so small source code changes may be required to use the environment variables, like so:

```js
const openai = OpenAI(
  Configuration({
    apiKey: process.env.OPENAI_API_KEY,
    basePath: process.env.OPENAI_API_BASE
  })
);
```

For apps made with the [chatgpt-api Node.js client library](https://github.com/transitive-bullshit/chatgpt-api):

```js
const api = new ChatGPTAPI({
  apiKey: process.env.OPENAI_API_KEY,
  apiBaseUrl: process.env.OPENAI_API_BASE
});
```
### Embeddings (alpha)

Embeddings requires `sentence-transformers` installed, but chat and completions will function without it loaded. The embeddings endpoint is currently using the HuggingFace model: `sentence-transformers/all-mpnet-base-v2` for embeddings. This produces 768 dimensional embeddings (the same as the text-davinci-002 embeddings), which is different from OpenAI's current default `text-embedding-ada-002` model which produces 1536 dimensional embeddings. The model is small-ish and fast-ish. This model and embedding size may change in the future.

| model name             | dimensions | input max tokens | speed | size | Avg. performance |
| ---------------------- | ---------- | ---------------- | ----- | ---- | ---------------- |
| text-embedding-ada-002 | 1536       | 8192             | -     | -    | -                |
| text-davinci-002       | 768        | 2046             | -     | -    | -                |
| all-mpnet-base-v2      | 768        | 384              | 2800  | 420M | 63.3             |
| all-MiniLM-L6-v2       | 384        | 256              | 14200 | 80M  | 58.8             |

In short, the all-MiniLM-L6-v2 model is 5x faster, 5x smaller ram, 2x smaller storage, and still offers good quality. Stats from (https://www.sbert.net/docs/pretrained_models.html). To change the model from the default you can set the environment variable `OPENEDAI_EMBEDDING_MODEL`, ex. "OPENEDAI_EMBEDDING_MODEL=all-MiniLM-L6-v2".

Warning: You cannot mix embeddings from different models even if they have the same dimensions. They are not comparable.

### Compatibility & not so compatibility

Note: the table below may be obsolete.

| API endpoint              | tested with                        | notes                                                                       |
| ------------------------- | ---------------------------------- | --------------------------------------------------------------------------- |
| /v1/chat/completions      | openai.ChatCompletion.create()     | Use it with instruction following models                                    |
| /v1/embeddings            | openai.Embedding.create()          | Using SentenceTransformer embeddings                                        |
| /v1/images/generations    | openai.Image.create()              | Bare bones, no model configuration, response_format='b64_json' only.        |
| /v1/moderations           | openai.Moderation.create()         | Basic initial support via embeddings                                        |
| /v1/models                | openai.Model.list()                | Lists models, Currently loaded model first, plus some compatibility options |
| /v1/models/{id}           | openai.Model.get()                 | returns whatever you ask for                                                |
| /v1/edits                 | openai.Edit.create()               | Removed, use /v1/chat/completions instead                                   |
| /v1/text_completion       | openai.Completion.create()         | Legacy endpoint, variable quality based on the model                        |
| /v1/completions           | openai api completions.create      | Legacy endpoint (v0.25)                                                     |
| /v1/engines/\*/embeddings | python-openai v0.25                | Legacy endpoint                                                             |
| /v1/engines/\*/generate   | openai engines.generate            | Legacy endpoint                                                             |
| /v1/engines               | openai engines.list                | Legacy Lists models                                                         |
| /v1/engines/{model_name}  | openai engines.get -i {model_name} | You can use this legacy endpoint to load models via the api or command line |
| /v1/images/edits          | openai.Image.create_edit()         | not yet supported                                                           |
| /v1/images/variations     | openai.Image.create_variation()    | not yet supported                                                           |
| /v1/audio/\*              | openai.Audio.\*                    | supported                                                                   |
| /v1/files\*               | openai.Files.\*                    | not yet supported                                                           |
| /v1/fine-tunes\*          | openai.FineTune.\*                 | not yet supported                                                           |
| /v1/search                | openai.search, engines.search      | not yet supported                                                           |

#### Applications

Almost everything needs the `OPENAI_API_KEY` and `OPENAI_API_BASE` environment variable set, but there are some exceptions.

Note: the table below may be obsolete.

| Compatibility | Application/Library    | Website                                                                        | Notes                                                                                                                                                                                                        |
| ------------- | ---------------------- | ------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| ✅❌          | openai-python (v0.25+) | https://github.com/openai/openai-python                                        | only the endpoints from above are working. OPENAI_API_BASE=http://127.0.0.1:5001/v1                                                                                                                          |
| ✅❌          | openai-node            | https://github.com/openai/openai-node                                          | only the endpoints from above are working. environment variables don't work by default, but can be configured (see above)                                                                                    |
| ✅❌          | chatgpt-api            | https://github.com/transitive-bullshit/chatgpt-api                             | only the endpoints from above are working. environment variables don't work by default, but can be configured (see above)                                                                                    |
| ✅            | anse                   | https://github.com/anse-app/anse                                               | API Key & URL configurable in UI, Images also work                                                                                                                                                           |
| ✅            | shell_gpt              | https://github.com/TheR1D/shell_gpt                                            | OPENAI_API_HOST=http://127.0.0.1:5001                                                                                                                                                                        |
| ✅            | gpt-shell              | https://github.com/jla/gpt-shell                                               | OPENAI_API_BASE=http://127.0.0.1:5001/v1                                                                                                                                                                     |
| ✅            | gpt-discord-bot        | https://github.com/openai/gpt-discord-bot                                      | OPENAI_API_BASE=http://127.0.0.1:5001/v1                                                                                                                                                                     |
| ✅            | OpenAI for Notepad++   | https://github.com/Krazal/nppopenai                                            | api_url=http://127.0.0.1:5001 in the config file, or environment variables                                                                                                                                   |
| ✅            | vscode-openai          | https://marketplace.visualstudio.com/items?itemName=AndrewButson.vscode-openai | OPENAI_API_BASE=http://127.0.0.1:5001/v1                                                                                                                                                                     |
| ✅❌          | langchain              | https://github.com/hwchase17/langchain                                         | OPENAI_API_BASE=http://127.0.0.1:5001/v1 even with a good 30B-4bit model the result is poor so far. It assumes zero shot python/json coding. Some model tailored prompt formatting improves results greatly. |
| ✅❌          | Auto-GPT               | https://github.com/Significant-Gravitas/Auto-GPT                               | OPENAI_API_BASE=http://127.0.0.1:5001/v1 Same issues as langchain. Also assumes a 4k+ context                                                                                                                |
| ✅❌          | babyagi                | https://github.com/yoheinakajima/babyagi                                       | OPENAI_API_BASE=http://127.0.0.1:5001/v1                                                                                                                                                                     |
| ❌            | guidance               | https://github.com/microsoft/guidance                                          | logit_bias and logprobs not yet supported                                                                                                                                                                    |