ultralytics 8.0.136 refactor and simplify package (#3748)

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/tracker/trackers/basetrack.py

@@ -1,71 +0,0 @@
-# Ultralytics YOLO 🚀, AGPL-3.0 license
-
-from collections import OrderedDict
-
-import numpy as np
-
-
-class TrackState:
-    """Enumeration of possible object tracking states."""
-
-    New = 0
-    Tracked = 1
-    Lost = 2
-    Removed = 3
-
-
-class BaseTrack:
-    """Base class for object tracking, handling basic track attributes and operations."""
-
-    _count = 0
-
-    track_id = 0
-    is_activated = False
-    state = TrackState.New
-
-    history = OrderedDict()
-    features = []
-    curr_feature = None
-    score = 0
-    start_frame = 0
-    frame_id = 0
-    time_since_update = 0
-
-    # Multi-camera
-    location = (np.inf, np.inf)
-
-    @property
-    def end_frame(self):
-        """Return the last frame ID of the track."""
-        return self.frame_id
-
-    @staticmethod
-    def next_id():
-        """Increment and return the global track ID counter."""
-        BaseTrack._count += 1
-        return BaseTrack._count
-
-    def activate(self, *args):
-        """Activate the track with the provided arguments."""
-        raise NotImplementedError
-
-    def predict(self):
-        """Predict the next state of the track."""
-        raise NotImplementedError
-
-    def update(self, *args, **kwargs):
-        """Update the track with new observations."""
-        raise NotImplementedError
-
-    def mark_lost(self):
-        """Mark the track as lost."""
-        self.state = TrackState.Lost
-
-    def mark_removed(self):
-        """Mark the track as removed."""
-        self.state = TrackState.Removed
-
-    @staticmethod
-    def reset_id():
-        """Reset the global track ID counter."""
-        BaseTrack._count = 0