Hot fix for numpy attr for ResultMediaEntity

Author: Songki Choi

otx/api/entities/result_media.py

@@ -82,7 +82,7 @@ def __init__(
         self.annotation_scene = annotation_scene
         self.roi = Annotation(Rectangle.generate_full_box(), labels=[]) if roi is None else roi
         self.label = label
-        self.numpy = np.copy(numpy)
+        self._numpy = np.copy(numpy)
 
     def __repr__(self):
         """Returns a string with all the attributes of the ResultMediaEntity."""