ultralytics 8.0.51 add assets and CI actions (#1296)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Paul Kehrer <paulhkehrer@gmail.com>

ultralytics/tracker/utils/matching.py

@@ -40,7 +40,10 @@ def linear_assignment(cost_matrix, thresh):
     if cost_matrix.size == 0:
         return np.empty((0, 2), dtype=int), tuple(range(cost_matrix.shape[0])), tuple(range(cost_matrix.shape[1]))
     matches, unmatched_a, unmatched_b = [], [], []
+
+    # TODO: investigate scipy.optimize.linear_sum_assignment() for lap.lapjv()
     cost, x, y = lap.lapjv(cost_matrix, extend_cost=True, cost_limit=thresh)
+
     matches.extend([ix, mx] for ix, mx in enumerate(x) if mx >= 0)
     unmatched_a = np.where(x < 0)[0]
     unmatched_b = np.where(y < 0)[0]