PR feedback.

Author: codemzs

src/Microsoft.ML.Dnn/ImageClassificationTrainer.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// 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;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;

src/Microsoft.ML.Dnn/LearningRateScheduler.cs

@@ -1,8 +1,11 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// 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;
 using System.Collections.Generic;
-using System.Text;
 
-namespace Microsoft.ML.Transforms
+namespace Microsoft.ML.Dnn
 {
     /// <summary>
     /// A class that contains the current train state to use for learning rate scheduling.

test/Microsoft.ML.Benchmarks/ImageClassificationBench.cs

@@ -7,15 +7,12 @@
 using System.IO.Compression;
 using System.Collections.Generic;
 using System.Linq;
-using System.Net;
-using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.ML.Data;
 using Microsoft.ML.Transforms;
 using BenchmarkDotNet.Attributes;
 using static Microsoft.ML.DataOperationsCatalog;
 using System.Net.Http;
-using System.Diagnostics;
 using Microsoft.ML.Dnn;
 
 namespace Microsoft.ML.Benchmarks