Fix float zeros format (#5491)

* Fix float zeros format

* 255 to integer

val.py

@@ -164,7 +164,7 @@ def run(data,
         t1 = time_sync()
         img = img.to(device, non_blocking=True)
         img = img.half() if half else img.float()  # uint8 to fp16/32
-        img /= 255.0  # 0 - 255 to 0.0 - 1.0
+        img /= 255  # 0 - 255 to 0.0 - 1.0
         targets = targets.to(device)
         nb, _, height, width = img.shape  # batch size, channels, height, width
         t2 = time_sync()