ultralytics 8.0.54 TFLite export improvements and fixes (#1447)

Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/modes/val.md

@@ -21,8 +21,8 @@ training `data` and arguments as model attributes. See Arguments section below f
         from ultralytics import YOLO
         
         # Load a model
-        model = YOLO("yolov8n.pt")  # load an official model
-        model = YOLO("path/to/best.pt")  # load a custom model
+        model = YOLO('yolov8n.pt')  # load an official model
+        model = YOLO('path/to/best.pt')  # load a custom model
         
         # Validate the model
         metrics = model.val()  # no arguments needed, dataset and settings remembered