Sync train and test iou_thresh (#1465)

* Sync train and test iou_thresh

* Sync train and test iou_thresh

* weights names .lower()

* Notebook update

tutorial.ipynb

@@ -727,7 +727,7 @@
       },
       "source": [
         "# Run YOLOv5x on COCO val2017\n",
-        "!python test.py --weights yolov5x.pt --data coco.yaml --img 640"
+        "!python test.py --weights yolov5x.pt --data coco.yaml --img 640 --iou 0.65"
       ],
       "execution_count": null,
       "outputs": [