added close functions

utils/data_logging_utils.py

@@ -265,8 +265,20 @@ class LogWriter():
 
         print("Sample Image successfully loaded!")
 
-    def graph(self):
-        pass
-
     def close(self):
-        pass
+        """Close the log writer
+
+        This function closes the two log writers.
+
+        Args:
+            None
+
+        Returns:
+            None
+
+        Raises
+            None
+        """
+        
+        self.log_writer['train'].close()
+        self.log_writer['test'].close()
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