ml.net

[cyberprophet]

// 1. Initalize ML.NET environment
MLContext mlContext = new MLContext();

// 2. Load training data
IDataView trainData = mlContext.Data.LoadFromTextFile("taxi-fare-train.csv", separatorChar:',');

// 3. Add data transformations
var dataProcessPipeline = mlContext.Transforms.Categorical.OneHotEncoding(
outputColumnName:"PaymentTypeEncoded", "PaymentType")
.Append(mlContext.Transforms.Concatenate(outputColumnName:"Features",
"PaymentTypeEncoded","PassengerCount","TripTime","TripDistance"));

// 4. Add algorithm
var trainer = mlContext.Regression.Trainers.Sdca(labelColumnName: "FareAmount", featureColumnName: "Features");

var trainingPipeline = dataProcessPipeline.Append(trainer);

// 5. Train model
var model = trainingPipeline.Fit(trainData);

// 6. Evaluate model on test data
IDataView testData = mlContext.Data.LoadFromTextFile("taxi-fare-test.csv");
IDataView predictions = model.Transform(testData);
var metrics = mlContext.Regression.Evaluate(predictions,"FareAmount");

// 7. Predict on sample data and print results
var input = new ModelInput
{
PassengerCount = 1,
TripTime = 1150,
TripDistance = 4,
PaymentType = "CRD"
};

var result = mlContext.Model.CreatePredictionEngine<ModelInput,ModelOutput>(model).Predict(input);

Console.WriteLine($"Predicted fare: {result.FareAmount}\nModel Quality (RSquared): {metrics.RSquared}");

[cyberchacha]

using Microsoft.ML;
using Microsoft.ML.AutoML;

class Program
{
static void Main(string[] args)
{
// 데이터를 불러옵니다.
var context = new MLContext();
var data = context.Data.LoadFromTextFile("iris-data.txt", separatorChar: ',');

    // AutoML 구성을 설정합니다.
    var experimentSettings = new RegressionExperimentSettings
    {
        MaxExperimentTimeInSeconds = 60, // 최대 실행 시간
        OptimizingMetric = RegressionMetric.RSquared // 최적화할 메트릭
    };

    // AutoML 실험을 실행합니다.
    var experiment = context.Auto().CreateRegressionExperiment(experimentSettings);
    var result = experiment.Execute(data);

    // 최상의 모델을 가져옵니다.
    var bestModel = result.BestRun.Model;
    
    // 예측을 수행합니다.
    var predictionEngine = context.Model.CreatePredictionEngine<IrisData, IrisPrediction>(bestModel);
    var prediction = predictionEngine.Predict(new IrisData { SepalLength = 5.1f, SepalWidth = 3.5f, PetalLength = 1.4f, PetalWidth = 0.2f });

    // 결과 출력
    Console.WriteLine($"Predicted Label: {prediction.Prediction}");
}

}

// 데이터 클래스
class IrisData
{
[LoadColumn(0)]
public float SepalLength;

[LoadColumn(1)]
public float SepalWidth;

[LoadColumn(2)]
public float PetalLength;

[LoadColumn(3)]
public float PetalWidth;

[LoadColumn(4)]
public string Label;

}

// 예측 클래스
class IrisPrediction
{
[ColumnName("Score")]
public float Prediction;
}

[cyberchacha]

https://learn.microsoft.com/ko-kr/dotnet/machine-learning/how-to-guides/how-to-use-the-automl-api