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243 lines
11 KiB
Markdown
243 lines
11 KiB
Markdown
# Extensions
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Extensions are defined by files named `script.py` inside subfolders of `text-generation-webui/extensions`. They are loaded at startup if the folder name is specified after the `--extensions` flag.
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For instance, `extensions/silero_tts/script.py` gets loaded with `python server.py --extensions silero_tts`.
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## [text-generation-webui-extensions](https://github.com/oobabooga/text-generation-webui-extensions)
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The repository above contains a directory of user extensions.
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If you create an extension, you are welcome to host it in a GitHub repository and submit a PR adding it to the list.
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## Built-in extensions
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|Extension|Description|
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|---------|-----------|
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|[openai](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/openai)| Creates an API that mimics the OpenAI API and can be used as a drop-in replacement. |
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|[multimodal](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/multimodal) | Adds multimodality support (text+images). For a detailed description see [README.md](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/multimodal/README.md) in the extension directory. |
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|[google_translate](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/google_translate)| Automatically translates inputs and outputs using Google Translate.|
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|[silero_tts](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/silero_tts)| Text-to-speech extension using [Silero](https://github.com/snakers4/silero-models). When used in chat mode, responses are replaced with an audio widget. |
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|[whisper_stt](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/whisper_stt)| Allows you to enter your inputs in chat mode using your microphone. |
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|[sd_api_pictures](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/sd_api_pictures)| Allows you to request pictures from the bot in chat mode, which will be generated using the AUTOMATIC1111 Stable Diffusion API. See examples [here](https://github.com/oobabooga/text-generation-webui/pull/309). |
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|[character_bias](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/character_bias)| Just a very simple example that adds a hidden string at the beginning of the bot's reply in chat mode. |
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|[send_pictures](https://github.com/oobabooga/text-generation-webui/blob/main/extensions/send_pictures/)| Creates an image upload field that can be used to send images to the bot in chat mode. Captions are automatically generated using BLIP. |
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|[gallery](https://github.com/oobabooga/text-generation-webui/blob/main/extensions/gallery/)| Creates a gallery with the chat characters and their pictures. |
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|[superbooga](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/superbooga)| An extension that uses ChromaDB to create an arbitrarily large pseudocontext, taking as input text files, URLs, or pasted text. Based on https://github.com/kaiokendev/superbig. |
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|[ngrok](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/ngrok)| Allows you to access the web UI remotely using the ngrok reverse tunnel service (free). It's an alternative to the built-in Gradio `--share` feature. |
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|[perplexity_colors](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/perplexity_colors)| Colors each token in the output text by its associated probability, as derived from the model logits. |
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## How to write an extension
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The extensions framework is based on special functions and variables that you can define in `script.py`. The functions are the following:
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| Function | Description |
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|-------------|-------------|
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| `def setup()` | Is executed when the extension gets imported. |
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| `def ui()` | Creates custom gradio elements when the UI is launched. |
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| `def custom_css()` | Returns custom CSS as a string. It is applied whenever the web UI is loaded. |
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| `def custom_js()` | Same as above but for javascript. |
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| `def input_modifier(string, state, is_chat=False)` | Modifies the input string before it enters the model. In chat mode, it is applied to the user message. Otherwise, it is applied to the entire prompt. |
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| `def output_modifier(string, state, is_chat=False)` | Modifies the output string before it is presented in the UI. In chat mode, it is applied to the bot's reply. Otherwise, it is applied to the entire output. |
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| `def chat_input_modifier(text, visible_text, state)` | Modifies both the visible and internal inputs in chat mode. Can be used to hijack the chat input with custom content. |
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| `def bot_prefix_modifier(string, state)` | Applied in chat mode to the prefix for the bot's reply. |
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| `def state_modifier(state)` | Modifies the dictionary containing the UI input parameters before it is used by the text generation functions. |
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| `def history_modifier(history)` | Modifies the chat history before the text generation in chat mode begins. |
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| `def custom_generate_reply(...)` | Overrides the main text generation function. |
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| `def custom_generate_chat_prompt(...)` | Overrides the prompt generator in chat mode. |
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| `def tokenizer_modifier(state, prompt, input_ids, input_embeds)` | Modifies the `input_ids`/`input_embeds` fed to the model. Should return `prompt`, `input_ids`, `input_embeds`. See the `multimodal` extension for an example. |
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| `def custom_tokenized_length(prompt)` | Used in conjunction with `tokenizer_modifier`, returns the length in tokens of `prompt`. See the `multimodal` extension for an example. |
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Additionally, you can define a special `params` dictionary. In it, the `display_name` key is used to define the displayed name of the extension in the UI, and the `is_tab` key is used to define whether the extension should appear in a new tab. By default, extensions appear at the bottom of the "Text generation" tab.
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Example:
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```python
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params = {
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"display_name": "Google Translate",
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"is_tab": True,
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}
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```
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The `params` dict may also contain variables that you want to be customizable through a `settings.yaml` file. For instance, assuming the extension is in `extensions/google_translate`, the variable `language string` in
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```python
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params = {
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"display_name": "Google Translate",
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"is_tab": True,
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"language string": "jp"
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}
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```
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can be customized by adding a key called `google_translate-language string` to `settings.yaml`:
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```python
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google_translate-language string: 'fr'
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```
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That is, the syntax for the key is `extension_name-variable_name`.
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## Using multiple extensions at the same time
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You can activate more than one extension at a time by providing their names separated by spaces after `--extensions`. The input, output, and bot prefix modifiers will be applied in the specified order.
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Example:
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```
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python server.py --extensions enthusiasm translate # First apply enthusiasm, then translate
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python server.py --extensions translate enthusiasm # First apply translate, then enthusiasm
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```
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Do note, that for:
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- `custom_generate_chat_prompt`
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- `custom_generate_reply`
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- `custom_tokenized_length`
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only the first declaration encountered will be used and the rest will be ignored.
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## A full example
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The source code below can be found at [extensions/example/script.py](https://github.com/oobabooga/text-generation-webui/tree/main/extensions/example/script.py).
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```python
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"""
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An example of extension. It does nothing, but you can add transformations
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before the return statements to customize the webui behavior.
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Starting from history_modifier and ending in output_modifier, the
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functions are declared in the same order that they are called at
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generation time.
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"""
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import gradio as gr
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import torch
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from transformers import LogitsProcessor
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from modules import chat, shared
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from modules.text_generation import (
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decode,
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encode,
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generate_reply,
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)
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params = {
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"display_name": "Example Extension",
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"is_tab": False,
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}
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class MyLogits(LogitsProcessor):
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"""
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Manipulates the probabilities for the next token before it gets sampled.
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Used in the logits_processor_modifier function below.
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"""
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def __init__(self):
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pass
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def __call__(self, input_ids, scores):
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# probs = torch.softmax(scores, dim=-1, dtype=torch.float)
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# probs[0] /= probs[0].sum()
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# scores = torch.log(probs / (1 - probs))
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return scores
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def history_modifier(history):
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"""
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Modifies the chat history.
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Only used in chat mode.
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"""
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return history
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def state_modifier(state):
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"""
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Modifies the state variable, which is a dictionary containing the input
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values in the UI like sliders and checkboxes.
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"""
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return state
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def chat_input_modifier(text, visible_text, state):
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"""
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Modifies the user input string in chat mode (visible_text).
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You can also modify the internal representation of the user
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input (text) to change how it will appear in the prompt.
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"""
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return text, visible_text
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def input_modifier(string, state, is_chat=False):
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"""
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In default/notebook modes, modifies the whole prompt.
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In chat mode, it is the same as chat_input_modifier but only applied
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to "text", here called "string", and not to "visible_text".
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"""
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return string
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def bot_prefix_modifier(string, state):
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"""
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Modifies the prefix for the next bot reply in chat mode.
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By default, the prefix will be something like "Bot Name:".
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"""
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return string
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def tokenizer_modifier(state, prompt, input_ids, input_embeds):
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"""
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Modifies the input ids and embeds.
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Used by the multimodal extension to put image embeddings in the prompt.
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Only used by loaders that use the transformers library for sampling.
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"""
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return prompt, input_ids, input_embeds
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def logits_processor_modifier(processor_list, input_ids):
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"""
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Adds logits processors to the list, allowing you to access and modify
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the next token probabilities.
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Only used by loaders that use the transformers library for sampling.
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"""
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processor_list.append(MyLogits())
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return processor_list
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def output_modifier(string, state, is_chat=False):
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"""
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Modifies the LLM output before it gets presented.
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In chat mode, the modified version goes into history['visible'],
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and the original version goes into history['internal'].
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"""
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return string
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def custom_generate_chat_prompt(user_input, state, **kwargs):
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"""
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Replaces the function that generates the prompt from the chat history.
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Only used in chat mode.
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"""
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result = chat.generate_chat_prompt(user_input, state, **kwargs)
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return result
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def custom_css():
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"""
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Returns a CSS string that gets appended to the CSS for the webui.
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"""
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return ''
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def custom_js():
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"""
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Returns a javascript string that gets appended to the javascript
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for the webui.
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"""
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return ''
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def setup():
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"""
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Gets executed only once, when the extension is imported.
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"""
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pass
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def ui():
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"""
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Gets executed when the UI is drawn. Custom gradio elements and
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their corresponding event handlers should be defined here.
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To learn about gradio components, check out the docs:
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https://gradio.app/docs/
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"""
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pass
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```
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