fix lint

Author: datumbox

torchvision/models/detection/transform.py

@@ -14,6 +14,7 @@ def _get_shape_onnx(image):
     from torch.onnx import operators
     return operators.shape_as_tensor(image)[-2:]
 
+
 @torch.jit.unused
 def _float_to_tensor_onnx(v):
     return torch.tensor(v)