CoreML NMS and half fixes (#143)

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

ultralytics/nn/tasks.py

@@ -142,7 +142,7 @@ class DetectionModel(BaseModel):
     # YOLOv5 detection model
     def __init__(self, cfg='yolov8n.yaml', ch=3, nc=None, verbose=True):  # model, input channels, number of classes
         super().__init__()
-        self.yaml = cfg if isinstance(cfg, dict) else yaml_load(check_yaml(cfg))  # cfg dict
+        self.yaml = cfg if isinstance(cfg, dict) else yaml_load(check_yaml(cfg), append_filename=True)  # cfg dict
 
         # Define model
         ch = self.yaml['ch'] = self.yaml.get('ch', ch)  # input channels