A hybrid machine-learning and optimization method to solve bi-level problems. (1st April 2018) - Bagloee, Saeed Asadi
Highlights: Bilevel problem has many applications. It is an NP-hard problem, difficult to solve. Machine learning hybridized with traditional optimization method is developed. Numerical results of a real dataset are highly promising. Abstract: Bi-level optimization has widespread applications in many disciplines including management, economy, energy, and transportation. Because it is by nature a NP-hard problem, finding an efficient and reliable solution method tailored to large sized cases of specific types is of the highest importance. To this end, we develop a hybrid method based on machine-learning and optimization. For numerical tests, we set up a highly challenging case: a nonlinear discrete bi-level problem with equilibrium constraints in transportation science, known as the discrete network design problem. The hybrid method transforms the original problem to an integer linear programing problem based on a supervised learning technique and a tractable nonlinear problem. This methodology is tested using a real dataset in which the results are found to be highly promising. For the machine learning tasks we employ MATLAB and to solve the optimization problems, we use GAMS (with CPLEX solver).