Example of how to use framework de Machine Learning ML.NET in your Xamarin.Forms applications - http://julianocustodio.com/utilizando-ml-net-em-aplicacoes-xamarin-forms

PredictionResult.cs

namespace DemoCommentary
{
    public class PredictionResult
    {
        public bool Predicition { get; set; }
        public float Probability { get; set; }
        public float Score { get; set; }
    }
}