ModelBuilderRegression.cs

public sealed class ModelBuilder
{
    private readonly string _trainingDataLocation;
    private readonly ILearningPipelineItem _algorythm;

    public ModelBuilder(string trainingDataLocation, ILearningPipelineItem algorythm)
    {
        _trainingDataLocation = trainingDataLocation;
        _algorythm = algorythm;
    }

    /// <summary>
    /// Using training data location that is passed trough constructor this method is building
    /// and training machine learning model.
    /// </summary>
    /// <returns>Trained machine learning model.</returns>
    public PredictionModel<BikeSharingDemandSample, BikeSharingDemandPrediction> BuildAndTrain()
    {
        var pipeline = new LearningPipeline();
        pipeline.Add(new TextLoader(_trainingDataLocation).CreateFrom<BikeSharingDemandSample>(useHeader: true, separator: ','));
        pipeline.Add(new ColumnCopier(("Count", "Label")));
        pipeline.Add(new ColumnConcatenator("Features", 
                                            "Season", 
                                            "Year", 
                                            "Month", 
                                            "Hour", 
                                            "Weekday", 
                                            "Weather", 
                                            "Temperature", 
                                            "NormalizedTemperature",
                                            "Humidity",
                                            "Windspeed"));
        pipeline.Add(_algorythm);

        return pipeline.Train<BikeSharingDemandSample, BikeSharingDemandPrediction>();
    }
}