31 lines
843 B
ObjectPascal
31 lines
843 B
ObjectPascal
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uses MLABC;
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begin
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var df := CsvLoader.Load('towns_russia.csv', inferCategorical := true);
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df := df.Select(['population', 'lat', 'lon', 'region_name', 'federal_district']);
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var imputer := new Imputer('population', 'lat', 'lon');
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df := imputer.FitTransform(df);
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var le1 := new LabelEncoder('region_name');
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df := le1.FitTransform(df);
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var le2 := new LabelEncoder('federal_district');
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df := le2.FitTransform(df);
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var features := ['lat', 'lon', 'region_name', 'federal_district'];
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var X := df.ToMatrix(features);
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var y := df.ToVector('population');
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var scaler := new StandardScaler;
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scaler.Fit(X);
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var Xscaled := scaler.Transform(X);
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var model := new LinearRegression;
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model.Fit(Xscaled, y);
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var preds := model.Predict(Xscaled);
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Println('RMSE:', Metrics.RMSE(y, preds):0:3);
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end.
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