在 Java (WEKA) 中使用多个目标字段进行预测

如何解决在 Java (WEKA) 中使用多个目标字段进行预测

我是 Weka 的新手，我想使用历史数据来预测未来值。为此，我在 Java 中使用了 Weka APIs WekaForecaster，但我发现很难找到基于多个选定目标进行预测的 API。我可以在 Weka 资源管理器中做到这一点，但不知道使用哪个 Weka API（如果存在）在 Java 中做到这一点。

This is the Weka panel with 3 selected attributes:

预测是基于所有三个属性完成的，并显示为单独的结果，我可以在 Java 中做同样的事情，但它只包含 1 个属性，不考虑其他两个，因此结果不太准确。

这是我的代码...

    import java.io.BufferedReader;
import java.io.FileReader;
import org.joda.time.DateTime;
import weka.classifiers.Evaluation;
import weka.classifiers.functions.LinearRegression;
import weka.classifiers.timeseries.WekaForecaster;
import weka.core.Instance;
import weka.core.Instances;
import weka.filters.supervised.attribute.TSLagMaker;

public class ForecastStack {

    public static void main(String args[]) throws Exception {

        Forecast f = new Forecast();

        f.predictTemp();

    }

    public void predictTemp() throws Exception {

        Instances data = new Instances(new BufferedReader(
                new FileReader("C:\\Users\\n.lukic\\OneDrive\\Desktop\\Laooconte\\Dati\\arff\\weather.arff")));

        data.setClassIndex(data.numAttributes() - 3); // radim uzorak na temp con index = data.length-3

        // build model
        LinearRegression rd = new LinearRegression();
        rd.buildClassifier(data);

        Evaluation eval = new Evaluation(data);
        eval.evaluateModel(rd,data);

        System.out.println("\n");
        System.out.println("Mean absolute error = " + eval.meanAbsoluteError());
        System.out.println("Root mean squared error = " + eval.rootMeanSquaredError());
        System.out.println("\n");

        WekaForecaster forecaster = new WekaForecaster();
        forecaster.setFieldsToForecast("Temperature");
        forecaster.setBaseForecaster(rd);
        forecaster.getTSLagMaker().setRemoveLeadingInstancesWithUnkNownLagValues(true);
        forecaster.getTSLagMaker().setTimeStampField("Date"); // date time stamp
        forecaster.getTSLagMaker().setMinLag(1);
        forecaster.getTSLagMaker().setMaxLag(12); // monthly data
        forecaster.getTSLagMaker().setAddMonthOfYear(true);
        forecaster.getTSLagMaker().setAddQuarterOfYear(true);
        forecaster.buildForecaster(data,System.out);
        DateTime currentDt = getCurrentDateTime(forecaster.getTSLagMaker());

        // output model
        System.out.println("Date                           ActTemperature  PredTemperature    Difference");
        for (int i = 0; i < data.numInstances(); i++) {
            double actualValue = data.instance(i).classValue();
            Instance newInst = data.instance(i);
            double predSMO = rd.classifyInstance(newInst);
            currentDt = advanceTime(forecaster.getTSLagMaker(),currentDt);
            double diff = predSMO - actualValue;
            System.out.println(currentDt + "," + actualValue + "," + predSMO + "    " + diff);
        }
    }

    private static DateTime getCurrentDateTime(TSLagMaker lm) throws Exception {
        return new DateTime((long) lm.getCurrentTimeStampValue());
    }

    private static DateTime advanceTime(TSLagMaker lm,DateTime dt) {
        return new DateTime((long) lm.advanceSuppliedTimeValue(dt.getMillis()));
    }

}

这是arff文件weather.arff：

@relation weather

@attribute Pressure numeric
@attribute Temperature numeric
@attribute Humidity numeric
@attribute Date date 'yyyy-MM-dd'

@data
1040,50,2018-01-01
1033,10,40,2018-02-01
1030,14,2018-03-01
1033,15,60,2018-04-01
1020,23,38,2018-05-01
1010,29,36,2018-06-01
1000,30,2018-07-01
999,37,45,2018-08-01
970,28,2018-09-01
1000,19,68,2018-10-01
1030,73,2018-11-01
1040,5,70,2018-12-01
1038,2,82,2019-01-01
1035,6,69,2019-02-01
1030,55,2019-03-01
1025,2019-04-01
1022,21,49,2019-05-01
1000,44,2019-06-01
995,34,39,2019-07-01
990,33,2019-08-01
999,52,2019-09-01
1010,18,2019-10-01
1030,8,84,2019-11-01
1033,3,67,2019-12-01
1035,88,2020-01-01
1030,4,76,2020-02-01
1028,56,2020-03-01
1025,22,2020-04-01
1022,27,46,2020-05-01
1010,31,2020-06-01
1005,2020-07-01
1000,65,2020-08-01
1004,66,2020-09-01
1015,72,2020-10-01
1025,2020-11-01
1040,2020-12-01

有人可以帮我吗？任何建议都会有用。 提前致谢。