private static void Learn(String learnFileContent)
 {
     UTF8Encoding enc = new UTF8Encoding();
     byte[] data = enc.GetBytes(learnFileContent);
     System.IO.StreamReader trainingStreamReader = new StreamReader(new MemoryStream(data));
     SharpEntropy.ITrainingEventReader eventReader = new SharpEntropy.BasicEventReader(new SharpEntropy.PlainTextByLineDataReader(trainingStreamReader));
     SharpEntropy.GisTrainer trainer = new SharpEntropy.GisTrainer();
     trainer.TrainModel(eventReader);
     model = new SharpEntropy.GisModel(trainer);
     positiveIdx = model.GetOutcomeIndex("Positive");
 }