Tune.java

/* Copyright 2021, Gurobi Optimization, LLC */ /* This example reads a model from a file and tunes it. It then writes the best parameter settings to a file and solves the model using these parameters. */ import gurobi.*; public class Tune { public static void main(String[] args) { if (args.length < 1) { System.out.println("Usage: java Tune filename"); System.exit(1); } try { GRBEnv env = new GRBEnv(); // Read model from file GRBModel model = new GRBModel(env, args[0]); // Set the TuneResults parameter to 1 model.set(GRB.IntParam.TuneResults, 1); // Tune the model model.tune(); // Get the number of tuning results int resultcount = model.get(GRB.IntAttr.TuneResultCount); if (resultcount > 0) { // Load the tuned parameters into the model's environment model.getTuneResult(0); // Write the tuned parameters to a file model.write("tune.prm"); // Solve the model using the tuned parameters model.optimize(); } // Dispose of model and environment model.dispose(); env.dispose(); } catch (GRBException e) { System.out.println("Error code: " + e.getErrorCode() + ". " + e.getMessage()); } } }