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>

docs/reference/utils/metrics.md

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+## ConfusionMatrix
+---
+### ::: ultralytics.utils.metrics.ConfusionMatrix
+<br><br>
+
+## Metric
+---
+### ::: ultralytics.utils.metrics.Metric
+<br><br>
+
+## DetMetrics
+---
+### ::: ultralytics.utils.metrics.DetMetrics
+<br><br>
+
+## SegmentMetrics
+---
+### ::: ultralytics.utils.metrics.SegmentMetrics
+<br><br>
+
+## PoseMetrics
+---
+### ::: ultralytics.utils.metrics.PoseMetrics
+<br><br>
+
+## ClassifyMetrics
+---
+### ::: ultralytics.utils.metrics.ClassifyMetrics
+<br><br>
+
+## box_area
+---
+### ::: ultralytics.utils.metrics.box_area
+<br><br>
+
+## bbox_ioa
+---
+### ::: ultralytics.utils.metrics.bbox_ioa
+<br><br>
+
+## box_iou
+---
+### ::: ultralytics.utils.metrics.box_iou
+<br><br>
+
+## bbox_iou
+---
+### ::: ultralytics.utils.metrics.bbox_iou
+<br><br>
+
+## mask_iou
+---
+### ::: ultralytics.utils.metrics.mask_iou
+<br><br>
+
+## kpt_iou
+---
+### ::: ultralytics.utils.metrics.kpt_iou
+<br><br>
+
+## smooth_BCE
+---
+### ::: ultralytics.utils.metrics.smooth_BCE
+<br><br>
+
+## smooth
+---
+### ::: ultralytics.utils.metrics.smooth
+<br><br>
+
+## plot_pr_curve
+---
+### ::: ultralytics.utils.metrics.plot_pr_curve
+<br><br>
+
+## plot_mc_curve
+---
+### ::: ultralytics.utils.metrics.plot_mc_curve
+<br><br>
+
+## compute_ap
+---
+### ::: ultralytics.utils.metrics.compute_ap
+<br><br>
+
+## ap_per_class
+---
+### ::: ultralytics.utils.metrics.ap_per_class
+<br><br>