Minor cleaning

Author: wschin

src/Microsoft.ML.Legacy/CSharpApi.cs

@@ -2317,7 +2317,7 @@ public sealed partial class TextLoaderArguments
         /// <summary>
         /// Import a dataset from a text file
         /// </summary>
-        [Obsolete("")]
+        [Obsolete]
         public sealed partial class TextLoader : Microsoft.ML.Legacy.ILearningPipelineLoader
         {
 

src/Microsoft.ML.Legacy/LearningPipelineDebugProxy.cs

@@ -236,6 +236,7 @@ public PipelineItemDebugColumn()
         }
     }
 
+    [Obsolete]
     [DebuggerDisplay("{Values}")]
     internal class PipelineItemDebugRow
     {

src/Microsoft.ML.Legacy/Models/BinaryClassificationEvaluator.cs

@@ -5,8 +5,8 @@
 using Microsoft.ML.Runtime;
 using Microsoft.ML.Runtime.Data;
 using Microsoft.ML.Legacy.Transforms;
-using System;
 
+#pragma warning disable 612
 namespace Microsoft.ML.Legacy.Models
 {
     public sealed partial class BinaryClassificationEvaluator

src/Microsoft.ML.Legacy/Models/ClusterEvaluator.cs

@@ -5,8 +5,8 @@
 using Microsoft.ML.Legacy.Transforms;
 using Microsoft.ML.Runtime;
 using Microsoft.ML.Runtime.Data;
-using System;
 
+#pragma warning disable 612
 namespace Microsoft.ML.Legacy.Models
 {
     public sealed partial class ClusterEvaluator

src/Microsoft.ML.Legacy/Runtime/EntryPoints/ImportTextData.cs

@@ -31,7 +31,6 @@ public sealed class Input
             public string CustomSchema = null;
         }
 
-        [Obsolete]
         [TlcModule.EntryPointKind(typeof(ILearningPipelineLoader))]
         public sealed class LoaderInput
         {
@@ -62,7 +61,6 @@ public static Output ImportText(IHostEnvironment env, Input input)
         }
 #pragma warning restore 0618
 
-        [Obsolete]
         [TlcModule.EntryPoint(Name = "Data.TextLoader", Desc = "Import a dataset from a text file")]
         public static Output TextLoader(IHostEnvironment env, LoaderInput input)
         {

src/Microsoft.ML.Legacy/Trainers/LightGBM.cs

@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System;
-
 namespace Microsoft.ML.Legacy.Trainers
 {
     /// <summary>