The upresnet10 model is not exported as a caffe model

I tried to train the upresnet10 model. I want to export it as a caffe model. On the gui, it is used by waifux2x-caffe. I tried to run `py .\convert_models.py`, which prompted me to export errors:

C.check_model(protobuf_string)
onnx.onnx_cpp2py_export.checker.ValidationError: Node () has input size 1 not in range [min=3, max=5].

==> Context: Bad node spec for node. Name:  OpType: Slice