Changed Binarizer node to be cast to the type of the predicted label column's data type

Author: harishsk

src/Microsoft.ML.Data/Scorers/BinaryClassifierScorer.cs

@@ -216,10 +216,11 @@ the predicted label is based on the sign of the score.
                 node = ctx.CreateNode(opType, ctx.GetVariableName(outColumnNames[1]), binarizerOutput, ctx.GetNodeName(opType));
                 node.AddAttribute("threshold", 0.0);
             }
+
             opType = "Cast";
             node = ctx.CreateNode(opType, binarizerOutput, ctx.GetVariableName(outColumnNames[0]), ctx.GetNodeName(opType), "");
-            var t = InternalDataKindExtensions.ToInternalDataKind(DataKind.Boolean).ToType();
-            node.AddAttribute("to", t);
+            var predictedLabelCol = OutputSchema.GetColumnOrNull(outColumnNames[0]);
+            node.AddAttribute("to", predictedLabelCol.HasValue ? predictedLabelCol.Value.Type.RawType : typeof(bool));
         }
 
         private protected override IDataTransform ApplyToDataCore(IHostEnvironment env, IDataView newSource)