using Microsoft.ML;

using System;

using System.Collections.Generic;

namespace ExpressionTransform

{

class Program

{

static void Main(string[] args)

{

var context = new MLContext();

var inputData = new List<SalaryInput>

{

new SalaryInput { IsManager = false, YearsExperience = 1f, Title = "Developer" },

new SalaryInput { IsManager = true, YearsExperience = 9f, Title = "Director", NumberOfTeamsManaged = 2 },

new SalaryInput { IsManager = false, YearsExperience = 4f, Title = "Analyst" }

};

var data = context.Data.LoadFromEnumerable(inputData);

var expressions = context.Transforms.Expression("SquareRootOutput", "(x) => sqrt(x)", "YearsExperience")

.Append(context.Transforms.Expression("TeamsManagedOutput", "(x, y) => x ? y : 0", nameof(SalaryInput.IsManager), nameof(SalaryInput.NumberOfTeamsManaged)))

.Append(context.Transforms.Expression("ToLowerOutput", "(x) => lower(x)", nameof(SalaryInput.Title)));

var expressionsTransformed = expressions.Fit(data).Transform(data);

var expressionsData = context.Data.CreateEnumerable<ExpressionOutput>(expressionsTransformed,

reuseRowObject: false);

foreach (var expression in expressionsData)

{

Console.WriteLine($"Square Root - {expression.SquareRootOutput}");

Console.WriteLine($"Teams Managed - {expression.TeamsManagedOutput}");

Console.WriteLine($"To Lower - {expression.ToLowerOutput}");

Console.WriteLine(Environment.NewLine);

}

Console.ReadLine();

}

}

}