Address comments and update entry-point catalog

Author: wschin

src/Microsoft.ML.FastTree/FastTree.cs

@@ -238,7 +238,7 @@ private protected void TrainCore(IChannel ch)
                 using (Timer.Time(TimerEvent.TotalTrain))
                     Train(ch);
                 if (FastTreeTrainerOptions.ExecutionTime)
-                    PrintExecutionTimes(ch);
+                    PrintExecutionTime(ch);
                 TrainedEnsemble = Ensemble;
                 if (FeatureMap != null)
                     TrainedEnsemble.RemapFeatures(FeatureMap);
@@ -258,7 +258,7 @@ private protected virtual void InitializeThreads(int numThreads)
             ThreadTaskManager.Initialize(numThreads);
         }
 
-        private protected virtual void PrintExecutionTimes(IChannel ch)
+        private protected virtual void PrintExecutionTime(IChannel ch)
         {
             ch.Info("Execution time breakdown:\n{0}", Timer.GetString());
         }

src/Microsoft.ML.FastTree/FastTreeArguments.cs

@@ -298,7 +298,7 @@ public abstract class TreeOptions : LearnerInputBaseWithGroupId
         public Double SoftmaxTemperature;
 
         /// <summary>
-        /// Print execution time breakdown to stdout.
+        /// Print execution time breakdown to ML.NET channel.
         /// </summary>
         [Argument(ArgumentType.AtMostOnce, HelpText = "Print execution time breakdown to stdout", ShortName = "et,ExecutionTimes")]
         public bool ExecutionTime;
@@ -397,17 +397,19 @@ public abstract class TreeOptions : LearnerInputBaseWithGroupId
         /// <summary>
         /// Print metrics graph for the first test set.
         /// </summary>
+        [BestFriend]
         [Argument(ArgumentType.LastOccurenceWins, HelpText = "Print metrics graph for the first test set", ShortName = "graph", Hide = true)]
         [TGUI(NotGui = true)]
-        public bool PrintTestGraph;
+        internal bool PrintTestGraph;
 
         /// <summary>
         /// Print Train and Validation metrics in graph.
         /// </summary>
         //It is only enabled if printTestGraph is also set
+        [BestFriend]
         [Argument(ArgumentType.LastOccurenceWins, HelpText = "Print Train and Validation metrics in graph", ShortName = "graphtv", Hide = true)]
         [TGUI(NotGui = true)]
-        public bool PrintTrainValidGraph;
+        internal bool PrintTrainValidGraph;
 
         /// <summary>
         /// Calculate metric values for train/valid/test every k rounds.