Add bruteforce sampler

Optuna/Sampler/BruteForceSampler.cs

@@ -0,0 +1,15 @@
+namespace Optuna.Sampler
+{
+    /// <summary>
+    /// https://optuna.readthedocs.io/en/stable/reference/samplers/generated/optuna.samplers.BruteForceSampler.html
+    /// </summary>
+    public class BruteForceSampler : SamplerBase
+    {
+        public dynamic ToPython(dynamic optuna)
+        {
+            return optuna.samplers.BruteForceSampler(
+                seed: Seed
+            );
+        }
+    }
+}

Tunny.Core/Settings/Sampler.cs

@@ -20,6 +20,7 @@ public class Sampler
         public QMCSampler QMC { get; set; } = new QMCSampler();
         public BoTorchSampler BoTorch { get; set; } = new BoTorchSampler();
         public GPSampler GP { get; set; } = new GPSampler();
+        public BruteForceSampler BruteForce { get; set; } = new BruteForceSampler();
 
         public dynamic ToPython(SamplerType type, string storagePath, bool hasConstraints, Dictionary<string, double> firstVariables)
         {
@@ -52,6 +53,9 @@ public dynamic ToPython(SamplerType type, string storagePath, bool hasConstraint
                 case SamplerType.Random:
                     optunaSampler = Random.ToPython(optuna);
                     break;
+                case SamplerType.BruteForce:
+                    optunaSampler = BruteForce.ToPython(optuna);
+                    break;
                 default:
                     throw new ArgumentException("Invalid sampler type.");
             }

Tunny.Core/TEnum/EndState.cs

@@ -7,6 +7,7 @@ public enum EndState
         StoppedByUser,
         DirectionNumNotMatch,
         UseExitStudyWithoutContinue,
-        Error
+        Error,
+        StoppedByOptuna
     }
 }

Tunny.Core/TEnum/SamplerType.cs

@@ -10,5 +10,6 @@ public enum SamplerType
         CmaEs = 5,
         QMC = 6,
         Random = 7,
+        BruteForce = 8,
     }
 }

Tunny/Solver/Algorithm.cs

@@ -213,7 +213,7 @@ private void RunOptimize(OptimizationHandlingInfo optInfo, out Parameter[] param
 
             while (true)
             {
-                if (result == null || CheckOptimizeComplete(optInfo.NTrials, optInfo.Timeout, trialNum, startTime))
+                if (result == null || CheckOptimizeComplete(optInfo, trialNum, startTime))
                 {
                     break;
                 }
@@ -235,7 +235,7 @@ private void RunPreferentialOptimize(OptimizationHandlingInfo optInfo, int nBatc
 
             while (true)
             {
-                if (result == null || CheckOptimizeComplete(optInfo.NTrials, optInfo.Timeout, trialNum, startTime))
+                if (result == null || CheckOptimizeComplete(optInfo, trialNum, startTime))
                 {
                     break;
                 }
@@ -261,7 +261,7 @@ private void RunHumanSidlerInputOptimize(OptimizationHandlingInfo optInfo, int n
 
             while (true)
             {
-                if (result == null || CheckOptimizeComplete(optInfo.NTrials, optInfo.Timeout, trialNum, startTime))
+                if (result == null || CheckOptimizeComplete(optInfo, trialNum, startTime))
                 {
                     break;
                 }
@@ -347,6 +347,7 @@ private TrialGrasshopperItems RunSingleOptimizeStep(OptimizationHandlingInfo opt
                 }
                 else if (optInfo.HumanSliderInput == null && optInfo.Preferential == null)
                 {
+                    dynamic aa = optInfo.Study._stop_flag;
                     optInfo.Study.tell(trial, result.Objectives.Numbers);
                     SetTrialResultLog(trialNum, result, optInfo, parameter);
                 }
@@ -447,9 +448,14 @@ private static TrialGrasshopperItems TenTimesNullResultErrorMessage()
             return null;
         }
 
-        private bool CheckOptimizeComplete(int nTrials, double timeout, int trialNum, DateTime startTime)
+        private bool CheckOptimizeComplete(OptimizationHandlingInfo optInfo, int trialNum, DateTime startTime)
         {
             TLog.MethodStart();
+
+            int nTrials = optInfo.NTrials;
+            double timeout = optInfo.Timeout;
+            dynamic study = optInfo.Study;
+
             bool isOptimizeCompleted = false;
             if (trialNum >= nTrials)
             {
@@ -467,6 +473,11 @@ private bool CheckOptimizeComplete(int nTrials, double timeout, int trialNum, Da
                 OptimizeLoop.IsForcedStopOptimize = false;
                 isOptimizeCompleted = true;
             }
+            else if (study._stop_flag)
+            {
+                EndState = EndState.StoppedByOptuna;
+                isOptimizeCompleted = true;
+            }
 
             return isOptimizeCompleted;
         }

Tunny/Solver/Solver.cs

@@ -115,6 +115,9 @@ private static void ToComponentEndMessage(Algorithm optimize, BoneFishComponent
                 case EndState.StoppedByUser:
                     message = "Solver completed successfully. The user stopped the solver.";
                     break;
+                case EndState.StoppedByOptuna:
+                    message = "Solver completed successfully. The Optuna stopped the solver.";
+                    break;
                 case EndState.DirectionNumNotMatch:
                     message = "Solver error. The number of Objective in the existing Study does not match the one that you tried to run; Match the number of objective, or change the \"Study Name\".";
                     break;
@@ -143,6 +146,9 @@ private static void ShowUIEndMessages(EndState endState)
                 case EndState.StoppedByUser:
                     TunnyMessageBox.Show("Solver completed successfully.\n\nThe user stopped the solver.", "Tunny");
                     break;
+                case EndState.StoppedByOptuna:
+                    TunnyMessageBox.Show("Solver completed successfully.\n\nThe Optuna stopped the solver.", "Tunny");
+                    break;
                 case EndState.DirectionNumNotMatch:
                     TunnyMessageBox.Show("Solver error.\n\nThe number of Objective in the existing Study does not match the one that you tried to run; Match the number of objective, or change the \"Study Name\".", "Tunny", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     break;