removed nms=False support

ultralytics/engine/exporter.py

@@ -1106,7 +1106,8 @@ class Exporter:
             raise ValueError("MCT export is not supported for end2end models.")
         if "C2f" not in self.model.__str__():
             raise ValueError("MCT export is only supported for YOLOv8 detection models")
-        check_requirements("model-compression-toolkit==2.1.1")
+        check_requirements(("model-compression-toolkit==2.1.1", "sony-custom-layers[torch]"))
+        from sony_custom_layers.pytorch.object_detection.nms import multiclass_nms
         import model_compression_toolkit as mct
 
         def representative_dataset_gen(dataloader=self.get_int8_calibration_dataloader(prefix)):
@@ -1145,10 +1146,6 @@ class Exporter:
             )[0]
         )
 
-        if self.args.nms:
-            check_requirements("sony-custom-layers[torch]")
-            from sony_custom_layers.pytorch.object_detection.nms import multiclass_nms
-
         class NMSWrapper(torch.nn.Module):
             def __init__(
                 self,