[AZ-171] Remove unused onnx_batch config, add macOS skip for CoreML tests

Made-with: Cursor

src/constants.py

@@ -38,7 +38,6 @@ class TrainingConfig(BaseModel):
 
 class ExportConfig(BaseModel):
     onnx_imgsz: int = 1280
-    onnx_batch: int = 4
 
 
 class Config(BaseModel):

src/exports.py

@@ -25,9 +25,7 @@ def export_rknn(model_path):
     pass
 
 
-def export_onnx(model_path, batch_size=None):
-    if batch_size is None:
-        batch_size = constants.config.export.onnx_batch
+def export_onnx(model_path):
     model = YOLO(model_path)
     onnx_path = Path(model_path).stem + '.onnx'
     if path.exists(onnx_path):
@@ -36,7 +34,6 @@ def export_onnx(model_path, batch_size=None):
     model.export(
         format="onnx",
         imgsz=constants.config.export.onnx_imgsz,
-        batch=batch_size,
         dynamic=True,
         simplify=True,
         nms=True,