Create voc.yaml

data/voc.yaml

+
+# train and val datasets (image directory or *.txt file with image paths)
+train: ../VOC/images/train/
+val: ../VOC/images/val//
+
+# number of classes
+nc: 20
+
+# class names
+names: ['aeroplane', 'bicycle','bird','boat','bottle','bus','car','cat','chair','cow','diningtable','dog','horse','motorbike','person','pottedplant','sheep','sofa','train','tvmonitor']