static void Main(string[] args)
{
if (args.Length < 1)
{
Console.Out.WriteLine("Usage: tune_cs filename");
return;
}
try {
GRBEnv env = new GRBEnv();
// Read model from file
GRBModel model = new GRBModel(env, args[0]);
// Set the TuneResults parameter to 1
model.GetEnv().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) {
Console.WriteLine("Error code: " + e.ErrorCode + ". " + e.Message);
}
}
public Dictionary <string, string> Solve(bool tune, bool debug, string tuneOutputFile = null, string paramFile = null)
{
var times = new Dictionary <string, string>();
var totalTime = Utils.TimeAction(() =>
{
try
{
// Create an empty environment, set options and start
GRBEnv env = new GRBEnv(true);
// Use gurobi's parameter reader to load the best file
if (paramFile != null)
{
env.ReadParams(paramFile);
}
if (!debug)
{
env.Set(GRB.IntParam.OutputFlag, 0);
}
env.Start();
// Create empty model
GRBModel model = new GRBModel(env);
(var grbSeated, var addDecisionVariableTime) = Utils.TimeFunction(() => AddSeatedBinaryVariables(model), "Add Decision Variables");
var addConstraintsTime = Utils.TimeAction(() => AddContraints(model, grbSeated), "Add Constraints");
var addObjectiveTime = Utils.TimeAction(() => AddObjective(model, grbSeated), "Add Objective");
var optimizeTime = Utils.TimeAction(() => model.Optimize(), "Optimizing");
if (tune)
{
model.Tune();
model.GetTuneResult(0);
model.Write(tuneOutputFile);
}
SeatGroups(grbSeated);
// Dispose of model and env
model.Dispose();
env.Dispose();
times.Add("Add Decision Variables", addDecisionVariableTime);
times.Add("Add Constraints", addConstraintsTime);
times.Add("Add Objective", addObjectiveTime);
times.Add("Optimizing", optimizeTime);
}
catch (GRBException e)
{
Console.WriteLine("Error code: " + e.ErrorCode + ". " + e.Message);
throw e;
}
}, "Total");
times.Add("Total", totalTime);
return(times);
}
