--- a
+++ b/utils/segment/metrics.py
@@ -0,0 +1,210 @@
+# YOLOv5 🚀 by Ultralytics, AGPL-3.0 license
+"""
+Model validation metrics
+"""
+
+import numpy as np
+
+from ..metrics import ap_per_class
+
+
+def fitness(x):
+    # Model fitness as a weighted combination of metrics
+    w = [0.0, 0.0, 0.1, 0.9, 0.0, 0.0, 0.1, 0.9]
+    return (x[:, :8] * w).sum(1)
+
+
+def ap_per_class_box_and_mask(
+        tp_m,
+        tp_b,
+        conf,
+        pred_cls,
+        target_cls,
+        plot=False,
+        save_dir='.',
+        names=(),
+):
+    """
+    Args:
+        tp_b: tp of boxes.
+        tp_m: tp of masks.
+        other arguments see `func: ap_per_class`.
+    """
+    results_boxes = ap_per_class(tp_b,
+                                 conf,
+                                 pred_cls,
+                                 target_cls,
+                                 plot=plot,
+                                 save_dir=save_dir,
+                                 names=names,
+                                 prefix='Box')[2:]
+    results_masks = ap_per_class(tp_m,
+                                 conf,
+                                 pred_cls,
+                                 target_cls,
+                                 plot=plot,
+                                 save_dir=save_dir,
+                                 names=names,
+                                 prefix='Mask')[2:]
+
+    results = {
+        'boxes': {
+            'p': results_boxes[0],
+            'r': results_boxes[1],
+            'ap': results_boxes[3],
+            'f1': results_boxes[2],
+            'ap_class': results_boxes[4]},
+        'masks': {
+            'p': results_masks[0],
+            'r': results_masks[1],
+            'ap': results_masks[3],
+            'f1': results_masks[2],
+            'ap_class': results_masks[4]}}
+    return results
+
+
+class Metric:
+
+    def __init__(self) -> None:
+        self.p = []  # (nc, )
+        self.r = []  # (nc, )
+        self.f1 = []  # (nc, )
+        self.all_ap = []  # (nc, 10)
+        self.ap_class_index = []  # (nc, )
+
+    @property
+    def ap50(self):
+        """AP@0.5 of all classes.
+        Return:
+            (nc, ) or [].
+        """
+        return self.all_ap[:, 0] if len(self.all_ap) else []
+
+    @property
+    def ap(self):
+        """AP@0.5:0.95
+        Return:
+            (nc, ) or [].
+        """
+        return self.all_ap.mean(1) if len(self.all_ap) else []
+
+    @property
+    def mp(self):
+        """mean precision of all classes.
+        Return:
+            float.
+        """
+        return self.p.mean() if len(self.p) else 0.0
+
+    @property
+    def mr(self):
+        """mean recall of all classes.
+        Return:
+            float.
+        """
+        return self.r.mean() if len(self.r) else 0.0
+
+    @property
+    def map50(self):
+        """Mean AP@0.5 of all classes.
+        Return:
+            float.
+        """
+        return self.all_ap[:, 0].mean() if len(self.all_ap) else 0.0
+
+    @property
+    def map(self):
+        """Mean AP@0.5:0.95 of all classes.
+        Return:
+            float.
+        """
+        return self.all_ap.mean() if len(self.all_ap) else 0.0
+
+    def mean_results(self):
+        """Mean of results, return mp, mr, map50, map"""
+        return (self.mp, self.mr, self.map50, self.map)
+
+    def class_result(self, i):
+        """class-aware result, return p[i], r[i], ap50[i], ap[i]"""
+        return (self.p[i], self.r[i], self.ap50[i], self.ap[i])
+
+    def get_maps(self, nc):
+        maps = np.zeros(nc) + self.map
+        for i, c in enumerate(self.ap_class_index):
+            maps[c] = self.ap[i]
+        return maps
+
+    def update(self, results):
+        """
+        Args:
+            results: tuple(p, r, ap, f1, ap_class)
+        """
+        p, r, all_ap, f1, ap_class_index = results
+        self.p = p
+        self.r = r
+        self.all_ap = all_ap
+        self.f1 = f1
+        self.ap_class_index = ap_class_index
+
+
+class Metrics:
+    """Metric for boxes and masks."""
+
+    def __init__(self) -> None:
+        self.metric_box = Metric()
+        self.metric_mask = Metric()
+
+    def update(self, results):
+        """
+        Args:
+            results: Dict{'boxes': Dict{}, 'masks': Dict{}}
+        """
+        self.metric_box.update(list(results['boxes'].values()))
+        self.metric_mask.update(list(results['masks'].values()))
+
+    def mean_results(self):
+        return self.metric_box.mean_results() + self.metric_mask.mean_results()
+
+    def class_result(self, i):
+        return self.metric_box.class_result(i) + self.metric_mask.class_result(i)
+
+    def get_maps(self, nc):
+        return self.metric_box.get_maps(nc) + self.metric_mask.get_maps(nc)
+
+    @property
+    def ap_class_index(self):
+        # boxes and masks have the same ap_class_index
+        return self.metric_box.ap_class_index
+
+
+KEYS = [
+    'train/box_loss',
+    'train/seg_loss',  # train loss
+    'train/obj_loss',
+    'train/cls_loss',
+    'metrics/precision(B)',
+    'metrics/recall(B)',
+    'metrics/mAP_0.5(B)',
+    'metrics/mAP_0.5:0.95(B)',  # metrics
+    'metrics/precision(M)',
+    'metrics/recall(M)',
+    'metrics/mAP_0.5(M)',
+    'metrics/mAP_0.5:0.95(M)',  # metrics
+    'val/box_loss',
+    'val/seg_loss',  # val loss
+    'val/obj_loss',
+    'val/cls_loss',
+    'x/lr0',
+    'x/lr1',
+    'x/lr2', ]
+
+BEST_KEYS = [
+    'best/epoch',
+    'best/precision(B)',
+    'best/recall(B)',
+    'best/mAP_0.5(B)',
+    'best/mAP_0.5:0.95(B)',
+    'best/precision(M)',
+    'best/recall(M)',
+    'best/mAP_0.5(M)',
+    'best/mAP_0.5:0.95(M)', ]