Convert TextNormalizer to estimator

src/Microsoft.ML.Data/Transforms/HashTransform.cs

@@ -1289,10 +1289,10 @@ public override void Process()
     /// </summary>
     public sealed class HashEstimator : IEstimator<HashTransformer>
     {
-        public const int NumBitsMin = 1;
-        public const int NumBitsLim = 32;
+        internal const int NumBitsMin = 1;
+        internal const int NumBitsLim = 32;
 
-        public static class Defaults
+        internal static class Defaults
         {
             public const int HashBits = NumBitsLim - 1;
             public const uint Seed = 314489979;

src/Microsoft.ML.Data/Transforms/KeyToVectorTransform.cs

@@ -208,17 +208,14 @@ private static IDataTransform Create(IHostEnvironment env, Arguments args, IData
 
             env.CheckValue(args.Column, nameof(args.Column));
             var cols = new ColumnInfo[args.Column.Length];
-            using (var ch = env.Start("ValidateArgs"))
+            for (int i = 0; i < cols.Length; i++)
             {
-                for (int i = 0; i < cols.Length; i++)
-                {
-                    var item = args.Column[i];
+                var item = args.Column[i];
 
-                    cols[i] = new ColumnInfo(item.Source ?? item.Name,
-                        item.Name,
-                        item.Bag ?? args.Bag);
-                };
-            }
+                cols[i] = new ColumnInfo(item.Source ?? item.Name,
+                    item.Name,
+                    item.Bag ?? args.Bag);
+            };
             return new KeyToVectorTransform(env, cols).MakeDataTransform(input);
         }
 
@@ -727,7 +724,7 @@ private bool SaveAsOnnxCore(OnnxContext ctx, int iinfo, ColInfo info, string src
                     // Note that one input feature got expended to an one-hot vector.
                     opType = "ReduceSum";
                     var reduceNode = ctx.CreateNode(opType, encodedVariableName, dstVariableName, ctx.GetNodeName(opType), "");
-                    reduceNode.AddAttribute("axes", new long[] { shape.Count - 1});
+                    reduceNode.AddAttribute("axes", new long[] { shape.Count - 1 });
                     reduceNode.AddAttribute("keepdims", 0);
                 }
                 return true;
@@ -737,7 +734,7 @@ private bool SaveAsOnnxCore(OnnxContext ctx, int iinfo, ColInfo info, string src
 
     public sealed class KeyToVectorEstimator : TrivialEstimator<KeyToVectorTransform>
     {
-        public static class Defaults
+        internal static class Defaults
         {
             public const bool Bag = false;
         }

src/Microsoft.ML.Legacy/CSharpApi.cs

@@ -16789,7 +16789,7 @@ public enum TextTransformLanguage
             Japanese = 7
         }
 
-        public enum TextNormalizerTransformCaseNormalizationMode
+        public enum TextNormalizerEstimatorCaseNormalizationMode
         {
             Lower = 0,
             Upper = 1,
@@ -16877,7 +16877,7 @@ public void AddColumn(string name, params string[] source)
             /// <summary>
             /// Casing text using the rules of the invariant culture.
             /// </summary>
-            public TextNormalizerTransformCaseNormalizationMode TextCase { get; set; } = TextNormalizerTransformCaseNormalizationMode.Lower;
+            public TextNormalizerEstimatorCaseNormalizationMode TextCase { get; set; } = TextNormalizerEstimatorCaseNormalizationMode.Lower;
 
             /// <summary>
             /// Whether to keep diacritical marks or remove them.

src/Microsoft.ML.Transforms/RffTransform.cs

@@ -642,7 +642,7 @@ private void TransformFeatures(ref VBuffer<float> src, ref VBuffer<float> dst, T
     /// </summary>
     public sealed class RffEstimator : IEstimator<RffTransform>
     {
-        public static class Defaults
+        internal static class Defaults
         {
             public const int NewDim = 1000;
             public const bool UseSin = false;