ultralytics 8.0.58 new SimpleClass, fixes and updates (#1636)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>

ultralytics/tracker/utils/matching.py

@@ -1,12 +1,20 @@
 # Ultralytics YOLO 🚀, GPL-3.0 license
 
-import lap
 import numpy as np
 import scipy
 from scipy.spatial.distance import cdist
 
 from .kalman_filter import chi2inv95
 
+try:
+    import lap  # for linear_assignment
+    assert lap.__version__  # verify package is not directory
+except (ImportError, AssertionError, AttributeError):
+    from ultralytics.yolo.utils.checks import check_requirements
+
+    check_requirements('lap>=0.4')  # install
+    import lap
+
 
 def merge_matches(m1, m2, shape):
     O, P, Q = shape