Fix linting

app/Services/DatasetReader/IDataSetReader.php

@@ -2,10 +2,15 @@
 
 namespace App\Services\DatasetReader;
 
-interface IDataSetReader {
-    public function getNextLine(): array | null;
+interface IDataSetReader
+{
+    public function getNextLine(): ?array;
+
     public function getInputSize(): int;
+
     public function reset(): void;
+
     public function getLastReadLineIndex(): int;
+
     public function getEpochExamplesCount(): int;
 }