The author does mention problems where LP solvers can be used to solve the problems instead of the neural network approach used for the others. See section 3 i

The author does mention problems where LP solvers can be used to solve the problems instead of the neural network approach used for the others. See section 3 in https://arxiv.org/pdf/2104.14516.pdf https://arxiv.org/pdf/2104.14516.pdf.