protected override void InternalLoadModelFromFile(string modelPath)
{
LpSolvePointer.delete_lp();
LpSolve.Init();
var IMPORTANT = 3;
var MPS_FREE = 8;
LpSolvePointer = Path.GetExtension(modelPath)?.Trim('.').ToLower() == "lp" ? LpSolve.read_LP(modelPath, IMPORTANT, null) : LpSolve.read_MPS(modelPath, IMPORTANT | MPS_FREE);
}