Replace other few miscellaneous usages of ColumnInfo with Schema.Column.

Author: TomFinley

src/Microsoft.ML.Data/DataView/Transposer.cs

@@ -8,7 +8,6 @@
 using System.Linq;
 using System.Reflection;
 using Microsoft.ML.Data;
-using Microsoft.ML.Runtime.CommandLine;
 using Microsoft.ML.Runtime.Data.IO;
 using Microsoft.ML.Runtime.Internal.Utilities;
 
@@ -36,7 +35,7 @@ internal sealed class Transposer : ITransposeDataView, IDisposable
         public readonly int RowCount;
         // -1 for input columns that were not transposed, a non-negative index into _cols for those that were.
         private readonly int[] _inputToTransposed;
-        private readonly ColumnInfo[] _cols;
+        private readonly Schema.Column[] _cols;
         private readonly int[] _splitLim;
         private readonly SchemaImpl _tschema;
         private bool _disposed;
@@ -104,13 +103,13 @@ private Transposer(IHost host, IDataView view, bool forceSave, int[] columns)
                 columnSet = columnSet.Where(c => ttschema.GetSlotType(c) == null);
             }
             columns = columnSet.ToArray();
-            _cols = new ColumnInfo[columns.Length];
+            _cols = new Schema.Column[columns.Length];
             var schema = _view.Schema;
             _nameToICol = new Dictionary<string, int>();
             _inputToTransposed = Utils.CreateArray(schema.Count, -1);
             for (int c = 0; c < columns.Length; ++c)
             {
-                _nameToICol[(_cols[c] = ColumnInfo.CreateFromIndex(schema, columns[c])).Name] = c;
+                _nameToICol[(_cols[c] = schema[columns[c]]).Name] = c;
                 _inputToTransposed[columns[c]] = c;
             }
 
@@ -305,7 +304,7 @@ public SchemaImpl(Transposer parent)
                 _slotTypes = new VectorType[_parent._cols.Length];
                 for (int c = 0; c < _slotTypes.Length; ++c)
                 {
-                    ColumnInfo srcInfo = _parent._cols[c];
+                    var srcInfo = _parent._cols[c];
                     var ctype = srcInfo.Type.ItemType;
                     var primitiveType = ctype as PrimitiveType;
                     _ectx.Assert(primitiveType != null);

src/Microsoft.ML.Recommender/RecommenderUtils.cs

@@ -2,7 +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.Threading;
 using Microsoft.ML.Data;
 using Microsoft.ML.Runtime.Data;
 using Microsoft.ML.Runtime.Internal.Utilities;
@@ -13,7 +12,7 @@ internal static class RecommenderUtils
     {
         /// <summary>
         /// Check if the considered data, <see cref="RoleMappedData"/>, contains column roles specified by <see cref="MatrixColumnIndexKind"/> and <see cref="MatrixRowIndexKind"/>.
-        /// If the column roles, <see cref="MatrixColumnIndexKind"/> and <see cref="MatrixRowIndexKind"/>, uniquely exist in data, their <see cref="ColumnInfo"/> would be assigned
+        /// If the column roles, <see cref="MatrixColumnIndexKind"/> and <see cref="MatrixRowIndexKind"/>, uniquely exist in data, their <see cref="Schema.Column"/> would be assigned
         /// to the two out parameters below.
         /// </summary>
         /// <param name="data">The considered data being checked</param>
@@ -39,8 +38,8 @@ private static bool TryMarshalGoodRowColumnType(ColumnType type, out KeyType key
         }
 
         /// <summary>
-        /// Checks whether a column kind in a RoleMappedData is unique, and its type
-        /// is a U4 key of known cardinality.
+        /// Checks whether a column kind in a <see cref="RoleMappedData"/> is unique, and its type
+        /// is a <see cref="DataKind.U4"/> key of known cardinality.
         /// </summary>
         /// <param name="data">The training examples</param>
         /// <param name="role">The column role to try to extract</param>