GraphAware\Reco4PHP\Engine\RecommendationEngine::filters PHP Method

    public function filters() : array;

 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);
             }
         }
     }
 }