ultralytics 8.0.172 faster LetterBox() and Classify Tune fix (#4766)

Co-authored-by: BardJun <70683507+jy1002@users.noreply.github.com>

ultralytics/models/yolo/classify/val.py

@@ -70,6 +70,7 @@ class ClassificationValidator(BaseValidator):
                                            on_plot=self.on_plot)
         self.metrics.speed = self.speed
         self.metrics.confusion_matrix = self.confusion_matrix
+        self.metrics.save_dir = self.save_dir
 
     def get_stats(self):
         """Returns a dictionary of metrics obtained by processing targets and predictions."""