public function removeIrrelevant(NodeInterface $input, RecommendationEngine $engine, Recommendations $recommendations)
{
foreach ($recommendations->getItems() as $recommendation) {
foreach ($engine->filters() as $filter) {
if (!$filter->doInclude($input, $recommendation->item())) {
$recommendations->remove($recommendation);
}
}
}
}
public function buildQuery(NodeInterface $input, Recommendations $recommendations)
{
$ids = [];
foreach ($recommendations->getItems() as $recommendation) {
$ids[] = $recommendation->item()->identity();
}
$query = 'UNWIND {ids} as id
MATCH (n) WHERE id(n) = id
RETURN id, size((n)<-[:FOLLOWS]-()) as followersCount';
return Statement::create($query, ['ids' => $ids]);
}
public final function produceRecommendations(NodeInterface $input, ResultCollection $resultCollection)
{
$result = $resultCollection->get($this->name());
$recommendations = new Recommendations($this->name());
foreach ($result->records() as $record) {
if ($record->hasValue($this->recoResultName())) {
$recommendations->add($record->value($this->recoResultName()), $this->name(), $this->buildScore($input, $record->value($this->recoResultName()), $record));
}
}
return $recommendations;
}
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 final function handleResultSet(Node $input, Result $result, Recommendations $recommendations)
{
$recordsMap = [];
foreach ($result->records() as $i => $record) {
if (!$record->hasValue($this->idResultName())) {
throw new \InvalidArgumentException(sprintf('The record does not contain a value with key "%s" in "%s"', $this->idResultName(), $this->name()));
}
$recordsMap[$record->get($this->idResultName())] = $record;
}
foreach ($recommendations->getItems() as $recommendation) {
if (array_key_exists($recommendation->item()->identity(), $recordsMap)) {
$this->postProcess($input, $recommendation, $recordsMap[$recommendation->item()->identity()]);
}
}
}
private function removeIrrelevant(Node $input, RecommendationEngine $engine, Recommendations $recommendations, array $blacklist)
{
foreach ($recommendations->getItems() as $recommendation) {
if (array_key_exists($recommendation->item()->identity(), $blacklist)) {
$recommendations->remove($recommendation);
} else {
foreach ($engine->filters() as $filter) {
if (!$filter->doInclude($input, $recommendation->item())) {
$recommendations->remove($recommendation);
break;
}
}
}
}
}
public function execute(NodeInterface $input, Recommendations $recommendations, RecommendationEngine $recommendationEngine)
{
$this->stack = $this->databaseService->getDriver()->stack('post_process_' . $recommendationEngine->name());
foreach ($recommendationEngine->postProcessors() as $postProcessor) {
if ($postProcessor instanceof CypherAwarePostProcessor) {
foreach ($recommendations->getItems() as $recommendation) {
$this->prepareQuery($input, $recommendation, $postProcessor);
}
}
}
try {
$results = $this->databaseService->getDriver()->runStack($this->stack);
$this->stack = null;
return $results;
} catch (\Exception $e) {
throw new \RuntimeException('PostProcess Query Exception - ' . $e->getMessage());
}
}
public function testResultGetTwoScoresIfDiscoveredTwice()
{
$node = FakeNode::createDummy();
$list = new Recommendations();
$list->add($node, 'e1', new SingleScore(1));
$list->add($node, 'e2', new SingleScore(1));
$this->assertEquals(1, $list->size());
$this->assertEquals(2, $list->getItems()[0]->totalScore());
$this->assertCount(2, $list->get(0)->getScores());
$this->assertArrayHasKey('e1', $list->get(0)->getScores());
$this->assertArrayHasKey('e2', $list->get(0)->getScores());
}
/**
* @param \GraphAware\Common\Type\NodeInterface $input
* @param \GraphAware\Reco4PHP\Result\Recommendations $recommendations
* @param \GraphAware\Reco4PHP\Engine\RecommendationEngine $recommendationEngine
*
* @return \GraphAware\Common\Result\ResultCollection
*/
public function execute(NodeInterface $input, Recommendations $recommendations, RecommendationEngine $recommendationEngine)
{
$stack = $this->databaseService->getDriver()->stack('post_process_' . $recommendationEngine->name());
foreach ($recommendationEngine->postProcessors() as $postProcessor) {
if ($postProcessor instanceof CypherAwarePostProcessor) {
foreach ($recommendations->getItems() as $recommendation) {
$tag = sprintf('post_process_%s_%d', $postProcessor->name(), $recommendation->item()->identity());
$statement = $postProcessor->buildQuery($input, $recommendation);
$stack->push($statement->text(), $statement->parameters(), $tag);
}
}
}
try {
$results = $this->databaseService->getDriver()->runStack($stack);
return $results;
} catch (\Exception $e) {
throw new \RuntimeException('PostProcess Query Exception - ' . $e->getMessage());
}
}
public function testReasons()
{
$node = FakeNode::createDummy();
$list = new Recommendations(new SimpleContext());
$list->add($node, 'disc1', new SingleScore(1, 'reason1'));
$list->add($node, 'disc1', new SingleScore(1, 'reason2'));
$list->add($node, 'disc2', new SingleScore(3, 'reason3'));
for ($i = 0; $i < 10; ++$i) {
$list->add($node, 'disc3', new SingleScore(1, 'reasond' . $i));
}
$reco = $list->get(0);
$this->assertEquals(15, $reco->totalScore());
$this->assertArrayHasKey('disc3', $reco->getScores());
$this->assertCount(10, $reco->getScore('disc3')->getScores());
}
/**
* @param \GraphAware\Reco4PHP\Result\Recommendations $recommendations
*/
public function merge(Recommendations $recommendations)
{
foreach ($recommendations->getItems() as $recommendation) {
$this->getOrCreate($recommendation->item())->addScores($recommendation->getScores());
}
}