Remove another ISchema because it's only used in Tensorflow

Author: wschin

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

@@ -69,80 +69,6 @@ public override bool IsColumnActive(int col)
         }
     }
 
-    /// <summary>
-    /// An <see cref="ISchema"/> that takes all column names and types as constructor parameters.
-    /// The columns do not have metadata.
-    /// </summary>
-    public abstract class SimpleSchemaBase : ISchema
-    {
-        protected readonly IExceptionContext Ectx;
-        private readonly string[] _names;
-        protected readonly ColumnType[] Types;
-        protected readonly Dictionary<string, int> ColumnNameMap;
-
-        public int ColumnCount => Types.Length;
-
-        protected SimpleSchemaBase(IExceptionContext ectx, params KeyValuePair<string, ColumnType>[] columns)
-        {
-            Contracts.CheckValueOrNull(ectx);
-            Ectx = ectx;
-            Ectx.CheckValue(columns, nameof(columns));
-
-            _names = new string[columns.Length];
-            Types = new ColumnType[columns.Length];
-            ColumnNameMap = new Dictionary<string, int>();
-            for (int i = 0; i < columns.Length; i++)
-            {
-                _names[i] = columns[i].Key;
-                Types[i] = columns[i].Value;
-                if (ColumnNameMap.ContainsKey(columns[i].Key))
-                    throw ectx.ExceptParam(nameof(columns), $"Duplicate column name: '{columns[i].Key}'");
-                ColumnNameMap[columns[i].Key] = i;
-            }
-        }
-
-        public bool TryGetColumnIndex(string name, out int col)
-        {
-            return ColumnNameMap.TryGetValue(name, out col);
-        }
-
-        public string GetColumnName(int col)
-        {
-            Ectx.CheckParam(0 <= col && col < ColumnCount, nameof(col));
-            return _names[col];
-        }
-
-        public ColumnType GetColumnType(int col)
-        {
-            Ectx.CheckParam(0 <= col && col < ColumnCount, nameof(col));
-            return Types[col];
-        }
-
-        public IEnumerable<KeyValuePair<string, ColumnType>> GetMetadataTypes(int col)
-        {
-            Ectx.Assert(0 <= col && col < ColumnCount);
-            return GetMetadataTypesCore(col);
-        }
-
-        protected abstract IEnumerable<KeyValuePair<string, ColumnType>> GetMetadataTypesCore(int col);
-
-        public ColumnType GetMetadataTypeOrNull(string kind, int col)
-        {
-            Ectx.CheckParam(0 <= col && col < ColumnCount, nameof(col));
-            return GetMetadataTypeOrNullCore(kind, col);
-        }
-
-        protected abstract ColumnType GetMetadataTypeOrNullCore(string kind, int col);
-
-        public void GetMetadata<TValue>(string kind, int col, ref TValue value)
-        {
-            Ectx.CheckParam(0 <= col && col < ColumnCount, nameof(col));
-            GetMetadataCore(kind, col, ref value);
-        }
-
-        protected abstract void GetMetadataCore<TValue>(string kind, int col, ref TValue value);
-    }
-
     public static class SimpleSchemaUtils
     {
         public static Schema Create(IExceptionContext ectx, params KeyValuePair<string, ColumnType>[] columns)