diff --git a/ultralytics/__init__.py b/ultralytics/__init__.py
index efc7f0c..35d3cb6 100644
--- a/ultralytics/__init__.py
+++ b/ultralytics/__init__.py
@@ -1,6 +1,6 @@
 # Ultralytics YOLO 🚀, GPL-3.0 license
 
-__version__ = '8.0.63'
+__version__ = '8.0.64'
 
 from ultralytics.hub import start
 from ultralytics.yolo.engine.model import YOLO
diff --git a/ultralytics/yolo/engine/model.py b/ultralytics/yolo/engine/model.py
index f96aac9..a67166d 100644
--- a/ultralytics/yolo/engine/model.py
+++ b/ultralytics/yolo/engine/model.py
@@ -1,7 +1,6 @@
 # Ultralytics YOLO 🚀, GPL-3.0 license
 
 import sys
-from copy import deepcopy
 from pathlib import Path
 from typing import Union
 
@@ -78,7 +77,7 @@ class YOLO:
             task (Any, optional): Task type for the YOLO model. Defaults to None.
 
         """
-        self.callbacks = deepcopy(callbacks.default_callbacks)
+        self._reset_callbacks()
         self.predictor = None  # reuse predictor
         self.model = None  # model object
         self.trainer = None  # trainer object
@@ -118,7 +117,7 @@ class YOLO:
         return any((
             model.startswith('https://hub.ultralytics.com/models/'),
             [len(x) for x in model.split('_')] == [42, 20],  # APIKEY_MODELID
-            (len(model) == 20 and not Path(model).exists() and not any(x in model for x in './\\'))))  # MODELID
+            len(model) == 20 and not Path(model).exists() and all(x not in model for x in './\\')))  # MODELID
 
     def _new(self, cfg: str, task=None, verbose=True):
         """
@@ -228,8 +227,8 @@ class YOLO:
         if source is None:
             source = ROOT / 'assets' if is_git_dir() else 'https://ultralytics.com/images/bus.jpg'
             LOGGER.warning(f"WARNING ⚠️ 'source' is missing. Using 'source={source}'.")
-        is_cli = (sys.argv[0].endswith('yolo') or sys.argv[0].endswith('ultralytics')) and (
-            ('predict' in sys.argv or 'mode=predict' in sys.argv) or ('track' in sys.argv or 'mode=track' in sys.argv))
+        is_cli = (sys.argv[0].endswith('yolo') or sys.argv[0].endswith('ultralytics')) and any(
+            x in sys.argv for x in ('predict', 'track', 'mode=predict', 'mode=track'))
         overrides = self.overrides.copy()
         overrides['conf'] = 0.25
         overrides.update(kwargs)  # prefer kwargs
@@ -238,7 +237,7 @@ class YOLO:
         overrides['save'] = kwargs.get('save', False)  # not save files by default
         if not self.predictor:
             self.task = overrides.get('task') or self.task
-            self.predictor = TASK_MAP[self.task][3](overrides=overrides, _callbacks=self.callbacks)
+            self.predictor = TASK_MAP[self.task][3](overrides=overrides)
             self.predictor.setup_model(model=self.model, verbose=is_cli)
         else:  # only update args if predictor is already setup
             self.predictor.args = get_cfg(self.predictor.args, overrides)
@@ -387,17 +386,19 @@ class YOLO:
         """
         return self.model.transforms if hasattr(self.model, 'transforms') else None
 
-    def add_callback(self, event: str, func):
+    @staticmethod
+    def add_callback(event: str, func):
         """
         Add callback
         """
-        self.callbacks[event].append(func)
+        callbacks.default_callbacks[event].append(func)
 
     @staticmethod
     def _reset_ckpt_args(args):
         include = {'imgsz', 'data', 'task', 'single_cls'}  # only remember these arguments when loading a PyTorch model
         return {k: v for k, v in args.items() if k in include}
 
-    def _reset_callbacks(self):
+    @staticmethod
+    def _reset_callbacks():
         for event in callbacks.default_callbacks.keys():
-            self.callbacks[event] = [callbacks.default_callbacks[event][0]]
+            callbacks.default_callbacks[event] = [callbacks.default_callbacks[event][0]]
diff --git a/ultralytics/yolo/engine/predictor.py b/ultralytics/yolo/engine/predictor.py
index cb24faf..82905ca 100644
--- a/ultralytics/yolo/engine/predictor.py
+++ b/ultralytics/yolo/engine/predictor.py
@@ -75,7 +75,7 @@ class BasePredictor:
         data_path (str): Path to data.
     """
 
-    def __init__(self, cfg=DEFAULT_CFG, overrides=None, _callbacks=None):
+    def __init__(self, cfg=DEFAULT_CFG, overrides=None):
         """
         Initializes the BasePredictor class.
 
@@ -104,7 +104,7 @@ class BasePredictor:
         self.data_path = None
         self.source_type = None
         self.batch = None
-        self.callbacks = defaultdict(list, _callbacks) if _callbacks else defaultdict(list, callbacks.default_callbacks)
+        self.callbacks = defaultdict(list, callbacks.default_callbacks)  # add callbacks
         callbacks.add_integration_callbacks(self)
 
     def preprocess(self, img):