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Tune.java
/* Copyright 2024, 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 com.gurobi.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 2 // // The first parameter setting is the result for the first solved // setting. The second entry the parameter setting of the best // parameter setting. model.set(GRB.IntParam.TuneResults, 2); // Tune the model model.tune(); // Get the number of tuning results int resultcount = model.get(GRB.IntAttr.TuneResultCount); if (resultcount >= 2) { // Load the tuned parameters into the model's environment // // Note, the first parameter setting is associated to the first // solved setting and the second parameter setting to best tune // result. model.getTuneResult(1); // 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()); } } }