ultralytics 8.0.67 Pose speeds, Comet and ClearML updates (#1871)

Co-authored-by: Ayush Chaurasia <ayush.chaurarsia@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Victor Sonck <victor.sonck@gmail.com>
Co-authored-by: Danny Kim <dh031200@gmail.com>

ultralytics/yolo/utils/callbacks/base.py

@@ -2,6 +2,8 @@
 """
 Base callbacks
 """
+from collections import defaultdict
+from copy import deepcopy
 
 
 # Trainer callbacks ----------------------------------------------------------------------------------------------------
@@ -143,6 +145,10 @@ default_callbacks = {
     'on_export_end': [on_export_end]}
 
 
+def get_default_callbacks():
+    return defaultdict(list, deepcopy(default_callbacks))
+
+
 def add_integration_callbacks(instance):
     from .clearml import callbacks as clearml_callbacks
     from .comet import callbacks as comet_callbacks