Traceback (most recent call last):
  File "save.py", line 19, in <module>
    torch.onnx.export(net, dummy, "Model.onnx", input_names=["image"], output_names=["output"])
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/__init__.py", line 148, in export
    strip_doc_string, dynamic_axes, keep_initializers_as_inputs)
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/utils.py", line 66, in export
    dynamic_axes=dynamic_axes, keep_initializers_as_inputs=keep_initializers_as_inputs)
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/utils.py", line 416, in _export
    fixed_batch_size=fixed_batch_size)
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/utils.py", line 296, in _model_to_graph
    fixed_batch_size=fixed_batch_size, params_dict=params_dict)
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/utils.py", line 135, in _optimize_graph
    graph = torch._C._jit_pass_onnx(graph, operator_export_type)
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/__init__.py", line 179, in _run_symbolic_function
    return utils._run_symbolic_function(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/utils.py", line 657, in _run_symbolic_function
    return op_fn(g, *inputs, **attrs)
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/symbolic_helper.py", line 129, in wrapper
    args = [_parse_arg(arg, arg_desc) for arg, arg_desc in zip(args, arg_descriptors)]
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/symbolic_helper.py", line 129, in <listcomp>
    args = [_parse_arg(arg, arg_desc) for arg, arg_desc in zip(args, arg_descriptors)]
  File "/usr/local/lib/python3.6/dist-packages/torch/onnx/symbolic_helper.py", line 82, in _parse_arg
    "', since it's not constant, please try to make "
RuntimeError: Failed to export an ONNX attribute 'onnx::Div', since it's not constant, please try to make things (e.g., kernel size) static if possible