ultralytics 8.0.210 docs updates and bug fixes (#6365)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: Ceyda Cinarel (재이다) <15624271+cceyda@users.noreply.github.com>
Co-authored-by: DennisJ <106725464+DennisJcy@users.noreply.github.com>
Co-authored-by: Dickson Neoh <dickson.neoh@gmail.com>
Co-authored-by: Sergiu Waxmann <47978446+sergiuwaxmann@users.noreply.github.com>
Co-authored-by: Luca Serra <56681681+luca-serra@users.noreply.github.com>

ultralytics/__init__.py

@@ -1,6 +1,6 @@
 # Ultralytics YOLO 🚀, AGPL-3.0 license
 
-__version__ = '8.0.209'
+__version__ = '8.0.210'
 
 from ultralytics.models import RTDETR, SAM, YOLO
 from ultralytics.models.fastsam import FastSAM

ultralytics/data/loaders.py

@@ -493,7 +493,7 @@ def autocast_list(source):
 LOADERS = LoadStreams, LoadPilAndNumpy, LoadImages, LoadScreenshots  # tuple
 
 
-def get_best_youtube_url(url, use_pafy=False):
+def get_best_youtube_url(url, use_pafy=True):
     """
     Retrieves the URL of the best quality MP4 video stream from a given YouTube video.
 

ultralytics/utils/metrics.py

@@ -223,6 +223,13 @@ class ConfusionMatrix:
             labels (Array[M, 5]): Ground truth bounding boxes and their associated class labels.
                                   Each row should contain (class, x1, y1, x2, y2).
         """
+        if labels.size(0) == 0:  # Check if labels is empty
+            if detections is not None:
+                detections = detections[detections[:, 4] > self.conf]
+                detection_classes = detections[:, 5].int()
+                for dc in detection_classes:
+                    self.matrix[dc, self.nc] += 1  # false positives
+            return
         if detections is None:
             gt_classes = labels.int()
             for gc in gt_classes: