TestMicrosoftML/testML/DictionaryToObjectConverter.cs

using Microsoft.CSharp;
using Microsoft.ML;
using Microsoft.ML.Data;
using System;
using System.CodeDom.Compiler;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace testML
{
	public static class DictionaryToObjectConverter
	{
		public static IEnumerable<object> Convert(List<Dictionary<string, object>> data, string toPredict, out Type classType, out DataViewSchema schema)
		{
			var schemaBuilder = new DataViewSchema.Builder();			

			var definition = new Dictionary<string, Type>();

			var sample = data.FirstOrDefault();
			if (sample != null)
			{
				foreach (var key in sample.Keys)
				{
					//Buscamos el tipo
					var sampleValue = (from x in data where x.ContainsKey(key) && x[key] != null select x[key]).FirstOrDefault();
					if (sampleValue != null)
					{
						var keyType = sampleValue.GetType();

						if (key == toPredict)
						{
							keyType = typeof(float);
						}

						definition.Add(key, keyType);

						if (keyType == typeof(string))
						{
							schemaBuilder.AddColumn(key, TextDataViewType.Instance);
						}
						else if (keyType == typeof(double))
						{
							schemaBuilder.AddColumn(key, NumberDataViewType.Double);
						}
						else if (keyType == typeof(float))
						{
							schemaBuilder.AddColumn(key, NumberDataViewType.Single);
						}
						else if (keyType == typeof(int))
						{
							schemaBuilder.AddColumn(key, NumberDataViewType.Int32);
						}
						else if (keyType == typeof(long))
						{
							schemaBuilder.AddColumn(key, NumberDataViewType.Int64);
						}
					}
				}
			}

			var converter = new DictionaryToObjectConverterClass()
			{
				ClassName = "OBJ" + Guid.NewGuid().ToString("N").ToUpper(),
				ToPredict = toPredict,
				Definition = definition
			};

			var classCode = converter.TransformText();

			string exDir = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory().Trim(Path.DirectorySeparatorChar);
			CompilerParameters compilerParameters = new CompilerParameters
			{
				GenerateExecutable = false,
				GenerateInMemory = true,
				IncludeDebugInformation = true,
				TreatWarningsAsErrors = false,
				CompilerOptions = string.Format("/target:library /lib:{0}", exDir)
			};

			var mlDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

			foreach (var item in AppDomain.CurrentDomain.GetAssemblies())
			{
				compilerParameters.ReferencedAssemblies.Add(item.Location);
			}


			//	compilerParameters.ReferencedAssemblies.Add(Assembly.GetExecutingAssembly().Location);

			CompilerResults compilerResults =
				new CSharpCodeProvider(new Dictionary<string, string> { { "CompilerVersion", "v4.0" } }).CompileAssemblyFromSource(compilerParameters,
					new string[] { classCode }
				);

			var dllAssembly = compilerResults.CompiledAssembly;

			classType = dllAssembly.GetType("DictionaryToObjectConverterNamespace." + converter.ClassName);

			Type listType = typeof(List<>);
			Type genericType = listType.MakeGenericType(classType);

			var result =(IList) Activator.CreateInstance(genericType) ;

			Dictionary<string, float> translate = new Dictionary<string, float>();
			translate.Add(string.Empty, 0);
			foreach (var inputData in data)
			{
				if (inputData.ContainsKey(toPredict) && inputData[toPredict] != null)
				{
					if (!translate.ContainsKey(inputData[toPredict] as string))
					{
						var max = translate.Values.Max()+1;
						translate.Add(inputData[toPredict] as string, max);
					}
				}
			}


				foreach (var inputData in data)
			{
				var outputData = (IDictionaryToObjectConverter)Activator.CreateInstance(classType);
				result.Add(outputData);

				foreach (var key in inputData.Keys)
				{
					if (key == toPredict)
					{
						outputData[key] = translate[inputData[key] as string ?? string.Empty];
					}
					else
					{
						outputData[key] = inputData[key];
					}
				}
			}

			schema = schemaBuilder.ToSchema();

			return (IEnumerable<object>)result;

		}
	}

	public partial class DictionaryToObjectConverterClass
	{
		public string ClassName { get; set; }
		public string ToPredict { get; set; }
		public Dictionary<string, Type> Definition { get; set; }
	}

	public interface IDictionaryToObjectConverter
	{
		object this[string propertyName] { get; set; }

		void SetValue(string propertyName, object value);

		object GetValue(string propertyName);
	}
}