Add unset in the code

app/Jobs/WowaJob.php

@@ -63,14 +63,14 @@ class WowaJob implements ShouldQueue
             $logger->debug("Feedback number : " . $i);
             $i++;
             $evidence_references = $feedback->report()->references;
-            $logger->debug("Var Dump references : " . var_dump($evidence_references));
             $is_true_alert[] = $feedback->is_true_alert;
             $scores_references = [];
             foreach ($evidence_references as $evidence_reference) {
                 $scores_references[] = Mark::get()->findEvidenceById($evidence_reference)->score;
-                $logger->debug("Var dump scores evidences : " . var_dump($scores_references));
             }
             $evidences[] = $scores_references;
+            unset($scores_references);
+            unset($evidence_references);
         }
         $logger->debug("End find all related evidences");
         $training_prameters = new TrainerParameters(