Model inference resulting in unknown rows and cols

[laurent.berger]

@mentejoao

I got this 4 dimension output and I need to create a blob from it to pass as input for another model.

A blob is a Mat
So you can do :

  Mat maskInput(vector<int> {1, 1, 256, 256}, CV_32FC1);
  netMask.setInput(maskInput, "mask_input");