Pass callbacks to validator (#7320)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/models/yolo/pose/train.py

@@ -49,7 +49,10 @@ class PoseTrainer(yolo.detect.DetectionTrainer):
     def get_validator(self):
         """Returns an instance of the PoseValidator class for validation."""
         self.loss_names = 'box_loss', 'pose_loss', 'kobj_loss', 'cls_loss', 'dfl_loss'
-        return yolo.pose.PoseValidator(self.test_loader, save_dir=self.save_dir, args=copy(self.args))
+        return yolo.pose.PoseValidator(self.test_loader,
+                                       save_dir=self.save_dir,
+                                       args=copy(self.args),
+                                       _callbacks=self.callbacks)
 
     def plot_training_samples(self, batch, ni):
         """Plot a batch of training samples with annotated class labels, bounding boxes, and keypoints."""