22 lines
503 B
ObjectPascal
22 lines
503 B
ObjectPascal
uses MLABC;
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begin
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var ds := Datasets.MoscowHousing;
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var df := ds.Data;
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var features := ['rooms','area','kitchen_area','floor','floors_total','metro_minutes'];
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var target := 'price';
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var X := df.ToMatrix(features);
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var y := df.ToVector(target);
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var (Xtrain, Xtest, ytrain, ytest) := Validation.TrainTestSplit(X, y, 0.2, 42);
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var model := new LinearRegression;
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model.Fit(Xtrain, ytrain);
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var pred := model.Predict(Xtest);
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Println('R²:', Metrics.R2(ytest, pred):0:3);
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end. |