public static IProblem RemoveRedundantOperations(this IProblem problem, StringBuilder getReport = null)
{
Stopwatch sw = Stopwatch.StartNew();
int mergeCounter = 0;
int OpCount() => problem.Jobs
.SelectMany(j => j.Routes)
.SelectMany(r => r.Operations)
.Count();
var result = new ModifiedIProblem(
problem.Jobs.Select(
j => new ModifiedIJob(j.Routes.Select(
r => new ModifiedIRoute(
r.RoutingPenalty,
r.Operations.RemoveRedundantOperations(ref mergeCounter).ToArray()))
.ToArray()))
.ToArray(),
problem.Objective,
problem.ProblemName);
getReport?
.AppendLine($"----------------- Report: Removing redundant operations. -----------------")
.Append($"# operation redundant = {mergeCounter} ")
.AppendLine(
$"(total {OpCount(),6} operations, {Math.Round(100.0 * mergeCounter / OpCount()),4}%)")
.AppendLine($"Simplification took {Math.Round(sw.ElapsedMilliseconds / 1000.0, 2)} sec.")
.AppendLine("------------------ End Report ------------------");
return(result);
}
public static IProblem RemoveRedundantMachines(this IProblem problem, StringBuilder getReport = null)
{
Stopwatch sw = Stopwatch.StartNew();
var redundant = problem.GetRedundantMachines();
int MachineCount() => problem.Jobs
.SelectMany(j => j.Routes)
.SelectMany(r => r.Operations)
.SelectMany(o => o.Machines)
.Distinct()
.Count();
int TotalMachineCount() => problem.Jobs
.SelectMany(j => j.Routes)
.SelectMany(r => r.Operations)
.SelectMany(o => o.Machines)
.Count();
int OpCount() => problem.Jobs
.SelectMany(j => j.Routes)
.SelectMany(r => r.Operations)
.Count();
getReport?
.AppendLine($"------------------ Report: Removing redundant machines. ------------------")
.Append($"# machines redundant = {redundant.Count,6} ")
.Append($"(total {MachineCount(),6} machines, {Math.Round(100.0 * redundant.Count / MachineCount()),4}%)")
.AppendLine();
int changedOps = 0;
int machinesRemovedFromOps = 0;
var result = new ModifiedIProblem(
problem.Jobs.Select(
j => new ModifiedIJob(j.Routes.Select(
r => new ModifiedIRoute(r.RoutingPenalty, r.Operations.Select(
o =>
{
if (getReport != null &&
o.Machines.Count() != o.Machines.Except(redundant).Count())
{
changedOps++;
machinesRemovedFromOps +=
o.Machines.Count() - o.Machines.Except(redundant).Count();
}
return(new ModifiedIOperation(
o.Runtime, o.EarliestEntry, o.LatestEntry,
o.DelayWeight, o.Machines.Except(redundant),
o.OutgoingConnections, o.IncomingConnections));
}).ToArray()))
.ToArray()))
.ToArray(),
problem.Objective,
problem.ProblemName);
getReport?
.Append($"# changed operations = {changedOps,6} ")
.Append($"(total {OpCount(),6} operations, {Math.Round(100.0 * changedOps / OpCount()),4}%)")
.AppendLine()
.Append($"# machine instances removed = {machinesRemovedFromOps,6} ")
.Append($"(total {TotalMachineCount(),6} instances, {Math.Round(100.0 * machinesRemovedFromOps / TotalMachineCount()),4}%)")
.AppendLine()
.AppendLine($"Simplification took {Math.Round(sw.ElapsedMilliseconds / 1000.0, 2)} sec.")
.AppendLine("------------------ End Report ------------------");
return(result);
}