ONNX export warning: Constant folding not applied on opset 12

1

While converting pytorch model to onnx

torch.onnx.export(model, 
                  dummy_input,  
                  save_path,  
                  operator_export_type=torch.onnx.OperatorExportTypes.ONNX, 
                  export_params=True, 
                  opset_version=12, 
                  verbose=False)

I get multiple lines of warning as below

Warning: Constant folding - Only steps=1 can be constant folded for opset >= 10 onnx::Slice op. Constant folding not applied.
Warning: Constant folding - Only steps=1 can be constant folded for opset >= 10 onnx::Slice op. Constant folding not applied.
.
.

System information

  • OS Platform and Distribution: Ubuntu 20.04
  • Python version: 3.7.11
  • Pytorch version: 1.10.2

How can I remove this warning? Does this affect prediction values?

2

@ptrblck could you please comment on this question. Thank you.