Sync train and test iou_thresh (#1465)

* Sync train and test iou_thresh

* Sync train and test iou_thresh

* weights names .lower()

* Notebook update

utils/google_utils.py

@@ -18,7 +18,7 @@ def gsutil_getsize(url=''):
 def attempt_download(weights):
     # Attempt to download pretrained weights if not found locally
     weights = weights.strip().replace("'", '')
-    file = Path(weights).name
+    file = Path(weights).name.lower()
 
     msg = weights + ' missing, try downloading from https://github.com/ultralytics/yolov5/releases/'
     models = ['yolov5s.pt', 'yolov5m.pt', 'yolov5l.pt', 'yolov5x.pt']  # available models