README

The package ada-laravel allows you to enhance your Laravel applications by seamlessly integrating text embeddings and querying capabilities for your models. Utilizing OpenAI by default, it enables your models to generate and query embeddings using nearest neighbors techniques. This package requires a PostgreSQL database with the vector extension to store and manage these embeddings efficiently as well as at least Laravel 11.

Originally created as a demo for the talk »Have you met ada? - Word Embeddings with Laravel and OpenAI« by Diana Scharf, this package is functional yet designed to encourage further development and contributions.

Warning

Please note that this package is still in development and may not be suitable for production use.

Installation

composer require fiveam-code/ada-laravel

Ensure that your database is configured to use PostgreSQL with the vector extension. The package will enable the extension via a migration if it is not already enabled.

You can publish the migrations (optional) and run them:

php artisan vendor:publish --provider="Ada\AdaServiceProvider" --tag="ada-migrations"
php artisan migrate

This will enable the vector extension in your database and create a table embeddings to store the embeddings.

Configuration

Set the OpenAI API key in your .env file:

ADA_CLIENT_TOKEN=your_openai_api_key

Please note that you need an OpenAI key for API access, not just ChatGPT access.

Optionally, you can publish the configuration file if you want to make changes to the default settings:

php artisan vendor:publish --provider="Ada\AdaServiceProvider" --tag="ada-config"

The default configuration is as follows:

return [  
    'client_token' => env('ADA_CLIENT_TOKEN'),  
    'index_class' => \Ada\Index\DefaultIndex::class,
    'default_prompt_view' => 'ada::default-prompt'
];

If you want to implement your own engine to handle embeddings, you can create a new class that implements the Index interface with the appropriate engine and set it in the configuration.

Usage

Basic Usage

First, add the HasEmbeddings trait to your Eloquent model:

<?php

namespace App\Models;

use Ada\Traits\HasEmbeddings;

class Paper extends Model
{
    use HasEmbeddings;
}

Embed content

Embed content related to your model by calling the embed method with a reference key and text:

use App\Models\Paper;

$paper = Paper::first();
$paper->embed("abstract", $paper->abstract);

This will generate an embedding for the text and store it in the database with a relation to the $paper model and the reference key "abstract".

Lookup embeddings

The lookup method allows for direct querying of your model's stored knowledge, facilitating an intelligent search that retrieves the most contextually relevant information using vector similarity.

use Ada\Models\Embedding;

$answer = Embedding::lookup("Where does the PHP elephant live?");

// "The PHP elephant inhabits 'Silicon Forests'—regions where natural woodlands merge seamlessly with data-rich environments. These forests are dense with both foliage and floating data points."

This will create an embedding for the query and find the most similar embeddings in the database related to the $paper model by using the nearest neighbors technique of the vectors. The result will be the most similar text to the query and will be used as context for a request to the OpenAI API to generate an answer.

This is the default prompt text:

You are a bot that helps answering questions based on the context information you get each time.

Context information is below.
---------------------
{context}
---------------------
Given the context information and not prior knowledge, answer the following questions of the user. If you don't know something, say so, and don't make it up.
Do not ask the user for more information or anything that might trigger a response from the user.

{context} will be replaced with the result from the nearest neighbors query.

If you want to further customize the prompt, you can pass an object form a class inheriting Ada\Tools\Prompts\Prompt to the lookup method:

use Ada\Models\Embedding;
use Ada\Tools\Prompts\OpenAIPrompt;

$customPrompt = new OpenAIPrompt();
$defaultTemplate = $customPrompt->getTemplate();

$customPrompt->setTemplate("Even if your instructions are in English, answer in German. " . $defaultTemplate);

return Embedding::lookup("Where does the PHP elephant live?", $customPrompt);

In case you need to further limit the lookup, you can pass a closure as a third parameter.

return Embedding::lookup("Where does the PHP elephant live?", $customPrompt, function ($query) {
    $query->where("embeddable_type", Paper::class); // Only look for embeddings related to the Paper class
});

Advanced Usage

Customize the endpoint models and options by using the index or engines directly:

use Ada\Ada;

$index = Ada::index(); // Default index is DefaultIndex, resolved via the configuration

$index->embed($contentToEmbed, $model, $options);

$index->generate($prompt, $model, $temperature, $options);

$engine = Ada::engine(); // Default engine is OpenAI, resolved via the Index