PHP code example of graphaware / reco4php

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

graphaware / reco4php example snippets

namespace GraphAware\Reco4PHP\Tests\Example\Discovery;

use GraphAware\Common\Cypher\Statement;
use GraphAware\Common\Type\Node;
use GraphAware\Reco4PHP\Context\Context;
use GraphAware\Reco4PHP\Engine\SingleDiscoveryEngine;

class RatedByOthers extends SingleDiscoveryEngine
{
    public function discoveryQuery(Node $input, Context $context)
    {
        $query = 'MATCH (input:User) WHERE id(input) = {id}
        MATCH (input)-[:RATED]->(m)<-[:RATED]-(o)
        WITH distinct o
        MATCH (o)-[:RATED]->(reco)
        RETURN distinct reco LIMIT 500';

        return Statement::create($query, ['id' => $input->identity()]);
    }

    public function name()
    {
        return "rated_by_others";
    }
}

namespace GraphAware\Reco4PHP\Tests\Example\Filter;

use GraphAware\Common\Type\Node;
use GraphAware\Reco4PHP\Filter\Filter;

class ExcludeOldMovies implements Filter
{
    public function doInclude(Node $input, Node $item)
    {
        $title = $item->value("title");
        preg_match('/(?:\()\d+(?:\))/', $title, $matches);

        if (isset($matches[0])) {
            $y = str_replace('(','',$matches[0]);
            $y = str_replace(')','', $y);
            $year = (int) $y;
            if ($year < 1999) {
                return false;
            }

            return true;
        }

        return false;
    }
}

namespace GraphAware\Reco4PHP\Tests\Example\Filter;

use GraphAware\Common\Cypher\Statement;
use GraphAware\Common\Type\Node;
use GraphAware\Reco4PHP\Filter\BaseBlacklistBuilder;

class AlreadyRatedBlackList extends BaseBlacklistBuilder
{
    public function blacklistQuery(Node $input)
    {
        $query = 'MATCH (input) WHERE id(input) = {inputId}
        MATCH (input)-[:RATED]->(movie)
        RETURN movie as item';

        return Statement::create($query, ['inputId' => $input->identity()]);
    }

    public function name()
    {
        return 'already_rated';
    }
}

namespace GraphAware\Reco4PHP\Tests\Example\PostProcessing;

use GraphAware\Common\Cypher\Statement;
use GraphAware\Common\Result\Record;
use GraphAware\Common\Type\Node;
use GraphAware\Reco4PHP\Post\RecommendationSetPostProcessor;
use GraphAware\Reco4PHP\Result\Recommendation;
use GraphAware\Reco4PHP\Result\Recommendations;
use GraphAware\Reco4PHP\Result\SingleScore;

class RewardWellRated extends RecommendationSetPostProcessor
{
    public function buildQuery(Node $input, Recommendations $recommendations)
    {
        $query = 'UNWIND {ids} as id
        MATCH (n) WHERE id(n) = id
        MATCH (n)<-[r:RATED]-(u)
        RETURN id(n) as id, sum(r.rating) as score';

        $ids = [];
        foreach ($recommendations->getItems() as $item) {
            $ids[] = $item->item()->identity();
        }

        return Statement::create($query, ['ids' => $ids]);
    }

    public function postProcess(Node $input, Recommendation $recommendation, Record $record)
    {
        $recommendation->addScore($this->name(), new SingleScore($record->get('score'), 'total_ratings_relationships'));
    }

    public function name()
    {
        return "reward_well_rated";
    }
}

namespace GraphAware\Reco4PHP\Tests\Example;

use GraphAware\Reco4PHP\Engine\BaseRecommendationEngine;
use GraphAware\Reco4PHP\Tests\Example\Filter\AlreadyRatedBlackList;
use GraphAware\Reco4PHP\Tests\Example\Filter\ExcludeOldMovies;
use GraphAware\Reco4PHP\Tests\Example\PostProcessing\RewardWellRated;
use GraphAware\Reco4PHP\Tests\Example\Discovery\RatedByOthers;

class ExampleRecommendationEngine extends BaseRecommendationEngine
{
    public function name()
    {
        return "example";
    }

    public function discoveryEngines()
    {
        return array(
            new RatedByOthers()
        );
    }

    public function blacklistBuilders()
    {
        return array(
            new AlreadyRatedBlackList()
        );
    }

    public function postProcessors()
    {
        return array(
            new RewardWellRated()
        );
    }

    public function filters()
    {
        return array(
            new ExcludeOldMovies()
        );
    }
}

namespace GraphAware\Reco4PHP\Tests\Example;

use GraphAware\Reco4PHP\Context\SimpleContext;
use GraphAware\Reco4PHP\RecommenderService;

class ExampleRecommenderService
{
    /**
     * @var \GraphAware\Reco4PHP\RecommenderService
     */
    protected $service;

    /**
     * ExampleRecommenderService constructor.
     * @param string $databaseUri
     */
    public function __construct($databaseUri)
    {
        $this->service = RecommenderService::create($databaseUri);
        $this->service->registerRecommendationEngine(new ExampleRecommendationEngine());
    }

    /**
     * @param int $id
     * @return \GraphAware\Reco4PHP\Result\Recommendations
     */
    public function recommendMovieForUserWithId($id)
    {
        $input = $this->service->findInputBy('User', 'id', $id);
        $recommendationEngine = $this->service->getRecommender("user_movie_reco");

        return $recommendationEngine->recommend($input, new SimpleContext());
    }
}

$recommender = new ExampleRecommendationService("http://localhost:7474");
$recommendation = $recommender->recommendMovieForUserWithId(460);

print_r($recommendations->getItems(1));

Array
(
    [0] => GraphAware\Reco4PHP\Result\Recommendation Object
        (
            [item:protected] => GraphAware\Bolt\Result\Type\Node Object
                (
                    [identity:protected] => 13248
                    [labels:protected] => Array
                        (
                            [0] => Movie
                        )

                    [properties:protected] => Array
                        (
                            [id] => 2571
                            [title] => Matrix, The (1999)
                        )

                )

            [scores:protected] => Array
                (
                    [rated_by_others] => GraphAware\Reco4PHP\Result\Score Object
                        (
                            [score:protected] => 1067
                            [scores:protected] => Array
                                (
                                    [0] => GraphAware\Reco4PHP\Result\SingleScore Object
                                        (
                                            [score:GraphAware\Reco4PHP\Result\SingleScore:private] => 1067
                                            [reason:GraphAware\Reco4PHP\Result\SingleScore:private] =>
                                        )

                                )

                        )

                    [reward_well_rated] => GraphAware\Reco4PHP\Result\Score Object
                        (
                            [score:protected] => 261
                            [scores:protected] => Array
                                (
                                    [0] => GraphAware\Reco4PHP\Result\SingleScore Object
                                        (
                                            [score:GraphAware\Reco4PHP\Result\SingleScore:private] => 261
                                            [reason:GraphAware\Reco4PHP\Result\SingleScore:private] =>
                                        )

                                )

                        )

                )

            [totalScore:protected] => 261
        )
)