Multi class predicted label shifted by one. #235

public class Digit
{
    [Column("0")] public float Up;

    [Column("1")] public float Middle;

    [Column("2")] public float Bottom;

    [Column("3")] public float UpLeft;
    [Column("4")] public float BottomLeft;
    [Column("5")] public float TopRight;
    [Column("6")] public float BottomRight;

    [Column("7")] [ColumnName("Label")] public float Label;
}

public class DigitPrediction
{
    [ColumnName("PredictedLabel")]
    public uint ExpectedDigit;

    [ColumnName("Score")]
    public float[] Score;
}


var pipeline = new LearningPipeline();
var data = new Digit[]
{
    new Digit { Up = 1, Middle = 0, Bottom = 1, UpLeft = 1, BottomLeft = 1, TopRight = 1, BottomRight = 1, Label = 0 },
    new Digit { Up = 0, Middle = 0, Bottom = 0, UpLeft = 0, BottomLeft = 0, TopRight = 1, BottomRight = 1, Label = 1 },
    new Digit { Up = 1, Middle = 1, Bottom = 1, UpLeft = 0, BottomLeft = 1, TopRight = 1, BottomRight = 0, Label = 2 },
    new Digit { Up = 1, Middle = 1, Bottom = 1, UpLeft = 0, BottomLeft = 0, TopRight = 1, BottomRight = 1, Label = 3 },
    new Digit { Up = 0, Middle = 1, Bottom = 0, UpLeft = 1, BottomLeft = 1, TopRight = 1, BottomRight = 1, Label = 4 },
    new Digit { Up = 1, Middle = 1, Bottom = 1, UpLeft = 1, BottomLeft = 1, TopRight = 0, BottomRight = 1, Label = 5 },
    new Digit { Up = 1, Middle = 1, Bottom = 1, UpLeft = 1, BottomLeft = 1, TopRight = 0, BottomRight = 1, Label = 6 },
    new Digit { Up = 1, Middle = 0, Bottom = 0, UpLeft = 0, BottomLeft = 0, TopRight = 1, BottomRight = 1, Label = 7 },
    new Digit { Up = 1, Middle = 1, Bottom = 1, UpLeft = 1, BottomLeft = 1, TopRight = 1, BottomRight = 1, Label = 8 },
    new Digit { Up = 1, Middle = 1, Bottom = 1, UpLeft = 1, BottomLeft = 0, TopRight = 1, BottomRight = 1, Label = 9 }

};
pipeline.Add(CollectionDataSource.Create(data));
pipeline.Add(new ColumnConcatenator("Features", "Up", "Middle", "Bottom", "UpLeft", "BottomLeft", "TopRight", "BottomRight"));
pipeline.Add(new StochasticDualCoordinateAscentClassifier());
var model = pipeline.Train<Digit, DigitPrediction>();
var prediction = model.Predict(new Digit
{
    Up = 1,
    Middle = 1,
    Bottom = 1,
    UpLeft = 1,
    BottomLeft = 1,
    TopRight = 1,
    BottomRight = 1});