minor #385 [Examples] Add example for RAG with ChromaDB (chr-hertel)

This PR was merged into the main branch.

Discussion
----------

[Examples] Add example for RAG with ChromaDB

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        |
| License       | MIT

Follows #381

Commits
-------

e11aab1 Add example for RAG with ChromaDB

Author: chr-hertel

examples/.env

@@ -120,3 +120,6 @@ MILVUS_DATABASE=symfony
 
 # Cerebras
 CEREBRAS_API_KEY=
+
+CHROMADB_HOST=http://127.0.0.1
+CHROMADB_PORT=8001

examples/compose.yaml

@@ -1,6 +1,6 @@
 services:
     chromadb:
-        image: chromadb/chroma
+        image: chromadb/chroma:0.5.23
         environment:
             IS_PERSISTENT: TRUE
             PERSIST_DIRECTORY: /chroma/chroma # this is the default path, change it as needed

examples/composer.json

@@ -6,6 +6,7 @@
     "require": {
         "ext-pdo": "*",
         "async-aws/bedrock-runtime": "^1.1",
+        "codewithkyrian/chromadb-php": "^0.4.0",
         "codewithkyrian/transformers": "^0.6.1",
         "doctrine/dbal": "^3.3|^4.0",
         "google/auth": "^1.47",

examples/rag/chromadb.php

@@ -0,0 +1,70 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Symfony\AI\Agent\Agent;
+use Symfony\AI\Agent\Toolbox\AgentProcessor;
+use Symfony\AI\Agent\Toolbox\Tool\SimilaritySearch;
+use Symfony\AI\Agent\Toolbox\Toolbox;
+use Symfony\AI\Fixtures\Movies;
+use Symfony\AI\Platform\Bridge\OpenAi\Embeddings;
+use Symfony\AI\Platform\Bridge\OpenAi\Gpt;
+use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
+use Symfony\AI\Store\Bridge\ChromaDb\Store;
+use Symfony\AI\Store\Document\Metadata;
+use Symfony\AI\Store\Document\TextDocument;
+use Symfony\AI\Store\Document\Vectorizer;
+use Symfony\AI\Store\Indexer;
+use Symfony\Component\Uid\Uuid;
+
+require_once dirname(__DIR__).'/bootstrap.php';
+
+// initialize the store
+
+$store = new Store(
+    (new Codewithkyrian\ChromaDB\Factory())
+        ->withHost(env('CHROMADB_HOST'))
+        ->withPort(env('CHROMADB_PORT'))
+        ->connect(),
+    'movies',
+);
+
+// create embeddings and documents
+$documents = [];
+foreach (Movies::all() as $i => $movie) {
+    $documents[] = new TextDocument(
+        id: Uuid::v4(),
+        content: 'Title: '.$movie['title'].\PHP_EOL.'Director: '.$movie['director'].\PHP_EOL.'Description: '.$movie['description'],
+        metadata: new Metadata($movie),
+    );
+}
+
+// create embeddings for documents
+$platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
+$vectorizer = new Vectorizer($platform, $embeddings = new Embeddings());
+$indexer = new Indexer($vectorizer, $store, logger());
+$indexer->index($documents);
+
+$model = new Gpt(Gpt::GPT_4O_MINI);
+
+$similaritySearch = new SimilaritySearch($platform, $embeddings, $store);
+$toolbox = new Toolbox([$similaritySearch], logger: logger());
+$processor = new AgentProcessor($toolbox);
+$agent = new Agent($platform, $model, [$processor], [$processor], logger());
+
+$messages = new MessageBag(
+    Message::forSystem('Please answer all user questions only using SimilaritySearch function.'),
+    Message::ofUser('Which movie fits the theme of technology?')
+);
+$result = $agent->call($messages);
+
+echo $result->getContent().\PHP_EOL;