Example usage for weka.core Instances instance

Introduction

In this page you can find the example usage for weka.core Instances instance.

Prototype

publicInstance instance(int index) 

Source Link

Document

Returns the instance at the given position.

Usage

From source file:adams.flow.transformer.WekaSetInstancesValue.java

License:Open Source License

/**
 * Executes the flow item.//  w ww .j  a v  a  2 s  . c  o m
 *
 * @return      null if everything is fine, otherwise error message
 */
@Override
protected String doExecute() {
    String result;
    Instances inst;
    int row;
    int index;

    result = null;

    inst = (Instances) m_InputToken.getPayload();
    inst = new Instances(inst);
    m_Row.setMax(inst.numInstances());
    m_Column.setData(inst);
    row = m_Row.getIntIndex();
    index = m_Column.getIntIndex();

    if (row == -1)
        result = "Failed to retrieve row: " + m_Row.getIndex();
    else if (index == -1)
        result = "Failed to retrieve column: " + m_Column.getIndex();

    if (result == null) {
        try {
            if (m_Value.equals("?")) {
                inst.instance(row).setMissing(index);
            } else {
                switch (inst.attribute(index).type()) {
                case Attribute.NUMERIC:
                    inst.instance(row).setValue(index, Utils.toDouble(m_Value));
                    break;

                case Attribute.DATE:
                    inst.instance(row).setValue(index, inst.attribute(index).parseDate(m_Value));
                    break;

                case Attribute.NOMINAL:
                case Attribute.STRING:
                    inst.instance(row).setValue(index, m_Value);
                    break;

                case Attribute.RELATIONAL:
                    result = "Relational attributes cannot be set!";
                    break;

                default:
                    result = "Unhandled attribute type: " + inst.attribute(index).type();
                }
            }
        } catch (Exception e) {
            result = handleException("Failed to set value: " + m_Column.getIndex() + " -> " + m_Value, e);
        }
    }

    // broadcast data
    if (result == null)
        m_OutputToken = new Token(inst);

    return result;
}

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From source file:adams.flow.transformer.WekaSubsets.java

License:Open Source License

/**
 * Executes the flow item./*ww w  .  jav a  2  s  . com*/
 *
 * @return      null if everything is fine, otherwise error message
 */
@Override
protected String doExecute() {
    String result;
    Instances data;
    Double old;
    Double curr;
    int i;
    int index;
    Instance inst;

    result = null;

    m_Queue.clear();

    // copy and sort data
    data = new Instances((Instances) m_InputToken.getPayload());
    m_Index.setData(data);
    ;
    index = m_Index.getIntIndex();
    data.sort(index);

    // create subsets
    old = null;
    i = 0;
    while (i < data.numInstances()) {
        inst = data.instance(i);
        curr = inst.value(index);
        if ((old == null) || !curr.equals(old)) {
            m_Queue.add(new Instances(data, data.numInstances()));
            old = curr;
        }
        m_Queue.get(m_Queue.size() - 1).add(inst);
        i++;
    }

    // compact subsets
    for (Instances sub : m_Queue)
        sub.compactify();

    return result;
}

---

From source file:adams.gui.tools.previewbrowser.InstanceExplorerHandler.java

License:Open Source License

/**
 * Creates the actual view.//from  w w  w  . ja v  a2s  .  co m
 *
 * @param file   the file to create the view for
 * @return      the view
 */
@Override
protected PreviewPanel createPreview(File file) {
    InstancePanel result;
    Instances dataset;
    int i;
    Instance inst;
    List<InstanceContainer> data;

    result = new InstancePanel();
    try {
        data = new ArrayList<InstanceContainer>();
        dataset = DataSource.read(file.getAbsolutePath());
        for (i = 0; i < dataset.numInstances(); i++) {
            inst = new Instance();
            inst.set(dataset.instance(i));
            inst.setID((i + 1) + "." + dataset.relationName());
            data.add(result.getContainerManager().newContainer(inst));
        }
        result.getContainerManager().addAll(data);
    } catch (Exception e) {
        getLogger().log(Level.SEVERE, "Failed to load dataset '" + file + "':", e);
    }

    return new PreviewPanel(result);
}

---

From source file:adams.gui.visualization.instance.InstanceExplorer.java

License:Open Source License

/**
 * pops up SQL Viewer for SQL statement.
 *///from  ww  w. ja v  a  2 s  . c om
public void loadDataFromDatabase() {
    InstanceQuery query;
    List<InstanceContainer> data;
    Instances dataset;
    Instance inst;
    int i;

    if (m_LoadFromDatabaseDialog == null) {
        if ((getParentFrame() != null) && (getParentFrame() instanceof JFrame))
            m_LoadFromDatabaseDialog = new SqlViewerDialog((JFrame) getParentFrame());
        else
            m_LoadFromDatabaseDialog = new SqlViewerDialog(null);
    }

    m_LoadFromDatabaseDialog.setVisible(true);
    if (m_LoadFromDatabaseDialog.getReturnValue() != JOptionPane.OK_OPTION)
        return;

    try {
        showStatus("Executing query: " + m_LoadFromDatabaseDialog.getQuery());
        query = new InstanceQuery();
        query.setDatabaseURL(m_LoadFromDatabaseDialog.getURL());
        query.setUsername(m_LoadFromDatabaseDialog.getUser());
        query.setPassword(m_LoadFromDatabaseDialog.getPassword());
        query.setQuery(m_LoadFromDatabaseDialog.getQuery());
        query.setSparseData(m_LoadFromDatabaseDialog.getGenerateSparseData());
        if (query.isConnected())
            query.disconnectFromDatabase();
        query.connectToDatabase();

        showStatus("Loading data...");
        data = new ArrayList<>();
        dataset = query.retrieveInstances();
        for (i = 0; i < dataset.numInstances(); i++) {
            inst = new Instance();
            inst.set(dataset.instance(i));
            inst.setID(dataset.relationName() + "." + i);
            data.add(getContainerManager().newContainer(inst));
            showStatus("Loading data " + (i + 1) + "/" + dataset.numInstances());
        }
        loadData(dataset, data);
    } catch (Exception e) {
        GUIHelper.showErrorMessage(this, "Failed to load data from database:\n" + Utils.throwableToString(e),
                "Database error");
    }

    showStatus("");
}

---

From source file:adams.gui.visualization.instance.InstanceExplorer.java

License:Open Source License

/**
 * pops up file dialog for loading dataset form disk.
 *
 * @param file   an optional file, use null to ignore
 *///from   w  ww.  j a  v  a 2s  .c o  m
public void loadDataFromDisk(File file) {
    if (m_LoadFromDiskDialog == null) {
        if (getParentDialog() != null)
            m_LoadFromDiskDialog = new LoadDatasetDialog(getParentDialog());
        else
            m_LoadFromDiskDialog = new LoadDatasetDialog(getParentFrame());
        m_LoadFromDiskDialog.setCurrent(new File(getProperties().getPath("InitialDir", "%h")));
        m_LoadFromDiskDialog.setDefaultAttributeRange(getProperties().getPath("AttributeRange", "first-last"));
        m_LoadFromDiskDialog.setDefaultClassIndex(getProperties().getPath("ClassIndex", ""));
        m_LoadFromDiskDialog.setDefaultSortIndex(getProperties().getPath("SortIndex", ""));
        m_LoadFromDiskDialog.setDefaultIncludeAttributes(Attribute.NUMERIC,
                getProperties().getBoolean("IncludeNumericAttributes", true));
        m_LoadFromDiskDialog.setDefaultIncludeAttributes(Attribute.DATE,
                getProperties().getBoolean("IncludeDateAttributes", false));
        m_LoadFromDiskDialog.setDefaultIncludeAttributes(Attribute.NOMINAL,
                getProperties().getBoolean("IncludeNominalAttributes", false));
        m_LoadFromDiskDialog.setDefaultIncludeAttributes(Attribute.STRING,
                getProperties().getBoolean("IncludeStringAttributes", false));
        m_LoadFromDiskDialog.setDefaultIncludeAttributes(Attribute.RELATIONAL,
                getProperties().getBoolean("IncludeRelationalAttributes", false));
        m_LoadFromDiskDialog.setAcceptListener((ChangeEvent e) -> {
            int[] indices = m_LoadFromDiskDialog.getIndices();
            if (indices == null)
                return;
            if (m_RecentFilesHandler != null)
                m_RecentFilesHandler.addRecentItem(m_LoadFromDiskDialog.getCurrent());

            HashSet<Integer> attTypes = new HashSet<>();
            if (m_LoadFromDiskDialog.getIncludeAttributes(Attribute.NUMERIC))
                attTypes.add(Attribute.NUMERIC);
            if (m_LoadFromDiskDialog.getIncludeAttributes(Attribute.DATE))
                attTypes.add(Attribute.DATE);
            if (m_LoadFromDiskDialog.getIncludeAttributes(Attribute.NOMINAL))
                attTypes.add(Attribute.NOMINAL);
            if (m_LoadFromDiskDialog.getIncludeAttributes(Attribute.STRING))
                attTypes.add(Attribute.STRING);
            if (m_LoadFromDiskDialog.getIncludeAttributes(Attribute.RELATIONAL))
                attTypes.add(Attribute.RELATIONAL);

            showStatus("Loading data...");
            List<InstanceContainer> data = new ArrayList<>();
            Instances dataset = m_LoadFromDiskDialog.getDataset();
            int[] additional = m_LoadFromDiskDialog.getAdditionalAttributes();
            Range range = m_LoadFromDiskDialog.getCurrentAttributeRange();
            int id = m_LoadFromDiskDialog.getCurrentIDIndex();
            for (int i = 0; i < indices.length; i++) {
                weka.core.Instance winst = dataset.instance(indices[i]);
                Instance inst = new Instance();
                inst.set(winst, i, additional, range, attTypes);
                if (id == -1) {
                    inst.setID((indices[i] + 1) + "." + dataset.relationName());
                } else {
                    if (winst.attribute(id).isNumeric())
                        inst.setID("" + winst.value(id));
                    else
                        inst.setID(winst.stringValue(id));
                }
                data.add(getContainerManager().newContainer(inst));
                showStatus("Loading data " + (i + 1) + "/" + dataset.numInstances());
            }
            loadData(dataset, data);

            showStatus("");
        });
    }

    if (file != null)
        m_LoadFromDiskDialog.setCurrent(file);
    m_LoadFromDiskDialog.setVisible(true);
}

---

From source file:adams.gui.visualization.instances.instancestable.Histogram.java

License:Open Source License

/**
 * Allows the user to generate a plot from either a row or a column.
 *
 * @param data   the instances to use/*  w  w w  .  j  a  va 2  s  .  c  o m*/
 * @param isColumn   whether to use column or row
 * @param index   the index of the row/column
 */
protected void plot(final InstancesTable table, final Instances data, final boolean isColumn, int index) {
    TDoubleArrayList list;
    HistogramFactory.SetupDialog setup;
    HistogramFactory.Dialog dialog;
    int i;
    ArrayHistogram last;
    int col;
    int row;
    Object value;

    // let user customize histogram
    if (GUIHelper.getParentDialog(table) != null)
        setup = HistogramFactory.getSetupDialog(GUIHelper.getParentDialog(table), ModalityType.DOCUMENT_MODAL);
    else
        setup = HistogramFactory.getSetupDialog(GUIHelper.getParentFrame(table), true);
    setup.setDefaultCloseOperation(HistogramFactory.SetupDialog.DISPOSE_ON_CLOSE);
    setup.setTitle("Histogram setup");
    last = (ArrayHistogram) table.getLastSetup(getClass(), true, !isColumn);
    if (last == null)
        last = new ArrayHistogram();
    setup.setCurrent(last);
    setup.setLocationRelativeTo(GUIHelper.getParentComponent(table));
    setup.setVisible(true);
    if (setup.getResult() != GenericObjectEditorDialog.APPROVE_OPTION)
        return;
    last = (ArrayHistogram) setup.getCurrent();
    table.addLastSetup(getClass(), true, !isColumn, last);

    // get data from instances
    list = new TDoubleArrayList();
    if (isColumn) {
        col = index + 1;
        for (i = 0; i < table.getRowCount(); i++) {
            value = table.getValueAt(i, col);
            if ((value != null) && (Utils.isDouble(value.toString())))
                list.add(Utils.toDouble(value.toString()));
        }
    } else {
        row = index;
        for (i = 0; i < data.numAttributes(); i++) {
            if (data.attribute(i).isNumeric() && !data.instance(row).isMissing(i))
                list.add(data.instance(row).value(i));
        }
    }

    // calculate histogram
    last.clear();

    // display histogram
    if (GUIHelper.getParentDialog(table) != null)
        dialog = HistogramFactory.getDialog(GUIHelper.getParentDialog(table), ModalityType.MODELESS);
    else
        dialog = HistogramFactory.getDialog(GUIHelper.getParentFrame(table), false);
    dialog.setDefaultCloseOperation(HistogramFactory.Dialog.DISPOSE_ON_CLOSE);
    if (isColumn)
        dialog.add(last, list.toArray(), "Column " + (index + 1) + "/" + data.attribute(index).name());
    else
        dialog.add(last, list.toArray(), "Row " + (index + 1));
    dialog.setLocationRelativeTo(GUIHelper.getParentComponent(table));
    dialog.setVisible(true);
}

---

From source file:adams.gui.visualization.instances.instancestable.JFreeChart.java

License:Open Source License

/**
 * Allows the user to generate a plot from either a row or a column.
 *
 * @param data   the instances to use/* w  ww .ja v  a 2 s  . co m*/
 * @param isColumn   whether the to use column or row
 * @param index   the index of the row/column
 */
protected void plot(final InstancesTable table, final Instances data, final boolean isColumn, int index) {
    final List<Double> list;
    List<Double> tmp;
    GenericObjectEditorDialog setup;
    int i;
    final String title;
    SwingWorker worker;
    adams.flow.sink.JFreeChartPlot last;
    int numPoints;
    String newPoints;
    int col;
    int row;
    Object value;
    final SpreadSheet sheet;
    Row srow;
    boolean sorted;
    boolean asc;

    numPoints = isColumn ? data.numInstances() : data.numAttributes();
    if (numPoints > MAX_POINTS) {
        newPoints = GUIHelper.showInputDialog(null,
                "More than " + MAX_POINTS + " data points to plot - enter sample size:", "" + numPoints);
        if (newPoints == null)
            return;
        if (!Utils.isInteger(newPoints))
            return;
        if (Integer.parseInt(newPoints) != numPoints)
            numPoints = Integer.parseInt(newPoints);
        else
            numPoints = -1;
    } else {
        numPoints = -1;
    }

    // let user customize plot
    if (GUIHelper.getParentDialog(table) != null)
        setup = new GenericObjectEditorDialog(GUIHelper.getParentDialog(table), ModalityType.DOCUMENT_MODAL);
    else
        setup = new GenericObjectEditorDialog(GUIHelper.getParentFrame(table), true);
    setup.setDefaultCloseOperation(GenericObjectEditorDialog.DISPOSE_ON_CLOSE);
    setup.getGOEEditor().setClassType(Actor.class);
    setup.getGOEEditor().setCanChangeClassInDialog(false);
    last = (adams.flow.sink.JFreeChartPlot) table.getLastSetup(getClass(), true, !isColumn);
    if (last == null)
        last = new adams.flow.sink.JFreeChartPlot();
    setup.setCurrent(last);
    setup.setLocationRelativeTo(GUIHelper.getParentComponent(table));
    setup.setVisible(true);
    if (setup.getResult() != GenericObjectEditorDialog.APPROVE_OPTION)
        return;
    last = (adams.flow.sink.JFreeChartPlot) setup.getCurrent();
    table.addLastSetup(getClass(), true, !isColumn, last);

    // get data from instances
    tmp = new ArrayList<>();
    sorted = false;
    asc = table.isAscending();
    if (isColumn) {
        col = index + 1;
        sorted = (table.getSortColumn() == col);
        for (i = 0; i < table.getRowCount(); i++) {
            value = table.getValueAt(i, col);
            if ((value != null) && (Utils.isDouble(value.toString())))
                tmp.add(Utils.toDouble(value.toString()));
        }
    } else {
        row = index;
        for (i = 0; i < data.numAttributes(); i++) {
            if (data.attribute(i).isNumeric() && !data.instance(row).isMissing(i))
                tmp.add(data.instance(row).value(i));
        }
    }

    if (numPoints > -1) {
        numPoints = Math.min(numPoints, tmp.size());
        Collections.shuffle(tmp, new Random(1));
        list = tmp.subList(0, numPoints);
        if (sorted) {
            Collections.sort(list);
            if (!asc)
                Collections.reverse(list);
        }
    } else {
        list = tmp;
    }

    // create new spreadsheet
    sheet = new DefaultSpreadSheet();
    sheet.getHeaderRow().addCell("x").setContentAsString(isColumn ? "Row" : "Column");
    sheet.getHeaderRow().addCell("y")
            .setContentAsString(isColumn ? data.attribute(index).name() : ("Row " + (index + 1)));
    for (i = 0; i < list.size(); i++) {
        srow = sheet.addRow();
        srow.addCell("x").setContent((double) i + 1.0);
        srow.addCell("y").setContent(list.get(i));
    }

    // generate plot
    if (isColumn)
        title = "Column " + (index + 1) + "/" + data.attribute(index).name();
    else
        title = "Row " + (index + 1);
    last.getChart().setTitle(sheet.getColumnName(1));

    worker = new SwingWorker() {
        @Override
        protected Object doInBackground() throws Exception {
            Flow flow = new Flow();
            flow.setDefaultCloseOperation(BaseFrame.DISPOSE_ON_CLOSE);

            StorageValue sv = new StorageValue();
            sv.setStorageName(new StorageName("values"));
            flow.add(sv);

            Object last = table.getLastSetup(JFreeChart.this.getClass(), true, !isColumn);
            adams.flow.sink.JFreeChartPlot plot = (adams.flow.sink.JFreeChartPlot) ((adams.flow.sink.JFreeChartPlot) last)
                    .shallowCopy();
            plot.setShortTitle(true);
            plot.setName(title);
            plot.setX(-2);
            plot.setY(-2);
            flow.add(plot);

            flow.setUp();
            flow.getStorage().put(new StorageName("values"), sheet);
            flow.execute();
            flow.wrapUp();
            return null;
        }
    };
    worker.execute();
}

---

From source file:adams.gui.visualization.instances.instancestable.SimplePlot.java

License:Open Source License

/**
 * Allows the user to generate a plot from either a row or a column.
 *
 * @param data   the instances to use//w w w  .  j av a2s  .  co m
 * @param isColumn   whether the to use column or row
 * @param index   the index of the row/column
 */
protected void plot(final InstancesTable table, final Instances data, final boolean isColumn, int index) {
    final List<Double> list;
    List<Double> tmp;
    GenericObjectEditorDialog setup;
    int i;
    final String title;
    SwingWorker worker;
    adams.flow.sink.SimplePlot last;
    int numPoints;
    String newPoints;
    int col;
    int row;
    Object value;
    boolean sorted;
    boolean asc;

    numPoints = isColumn ? data.numInstances() : data.numAttributes();
    if (numPoints > MAX_POINTS) {
        newPoints = GUIHelper.showInputDialog(null,
                "More than " + MAX_POINTS + " data points to plot - enter sample size:", "" + numPoints);
        if (newPoints == null)
            return;
        if (!Utils.isInteger(newPoints))
            return;
        if (Integer.parseInt(newPoints) != numPoints)
            numPoints = Integer.parseInt(newPoints);
        else
            numPoints = -1;
    } else {
        numPoints = -1;
    }

    // let user customize plot
    if (GUIHelper.getParentDialog(table) != null)
        setup = new GenericObjectEditorDialog(GUIHelper.getParentDialog(table), ModalityType.DOCUMENT_MODAL);
    else
        setup = new GenericObjectEditorDialog(GUIHelper.getParentFrame(table), true);
    setup.setDefaultCloseOperation(GenericObjectEditorDialog.DISPOSE_ON_CLOSE);
    setup.getGOEEditor().setClassType(Actor.class);
    setup.getGOEEditor().setCanChangeClassInDialog(false);
    last = (adams.flow.sink.SimplePlot) table.getLastSetup(getClass(), true, !isColumn);
    if (last == null) {
        last = new adams.flow.sink.SimplePlot();
        last.setNoToolTips(true);
        last.setMouseClickAction(new ViewDataClickAction());
    }
    setup.setCurrent(last);
    setup.setLocationRelativeTo(GUIHelper.getParentComponent(table));
    setup.setVisible(true);
    if (setup.getResult() != GenericObjectEditorDialog.APPROVE_OPTION)
        return;
    last = (adams.flow.sink.SimplePlot) setup.getCurrent();
    table.addLastSetup(getClass(), true, !isColumn, last);

    // get data from instances
    tmp = new ArrayList<>();
    sorted = false;
    asc = table.isAscending();
    if (isColumn) {
        col = index + 1;
        sorted = (table.getSortColumn() == col);
        for (i = 0; i < table.getRowCount(); i++) {
            value = table.getValueAt(i, col);
            if ((value != null) && (Utils.isDouble(value.toString())))
                tmp.add(Utils.toDouble(value.toString()));
        }
    } else {
        row = index;
        for (i = 0; i < data.numAttributes(); i++) {
            if (data.attribute(i).isNumeric() && !data.instance(row).isMissing(i))
                tmp.add(data.instance(row).value(i));
        }
    }

    if (numPoints > -1) {
        numPoints = Math.min(numPoints, tmp.size());
        Collections.shuffle(tmp, new Random(1));
        list = tmp.subList(0, numPoints);
        if (sorted) {
            Collections.sort(list);
            if (!asc)
                Collections.reverse(list);
        }
    } else {
        list = tmp;
    }

    // generate plot
    if (isColumn)
        title = "Column " + (index + 1) + "/" + data.attribute(index).name();
    else
        title = "Row " + (index + 1);

    worker = new SwingWorker() {
        @Override
        protected Object doInBackground() throws Exception {
            Flow flow = new Flow();
            flow.setDefaultCloseOperation(BaseFrame.DISPOSE_ON_CLOSE);

            StorageValue sv = new StorageValue();
            sv.setStorageName(new StorageName("values"));
            flow.add(sv);

            ArrayToSequence a2s = new ArrayToSequence();
            flow.add(a2s);

            MakePlotContainer mpc = new MakePlotContainer();
            mpc.setPlotName(title);
            flow.add(mpc);

            Object last = table.getLastSetup(SimplePlot.this.getClass(), true, !isColumn);
            adams.flow.sink.SimplePlot plot = (adams.flow.sink.SimplePlot) ((adams.flow.sink.SimplePlot) last)
                    .shallowCopy();
            plot.setShortTitle(true);
            plot.setShowSidePanel(false);
            plot.setName(title);
            plot.setX(-2);
            plot.setY(-2);
            flow.add(plot);

            flow.setUp();
            flow.getStorage().put(new StorageName("values"), list.toArray(new Double[list.size()]));
            flow.execute();
            flow.wrapUp();
            return null;
        }
    };
    worker.execute();
}

---

From source file:adams.gui.visualization.instances.InstancesTable.java

License:Open Source License

/**
 * Exports the data./* w  w  w .ja  v a2s . c o  m*/
 *
 * @param range   what data to export
 */
protected void saveAs(TableRowRange range) {
    int retVal;
    AbstractFileSaver saver;
    File file;
    Instances original;
    Instances data;
    int[] selRows;
    int i;

    retVal = m_FileChooser.showSaveDialog(InstancesTable.this);
    if (retVal != WekaFileChooser.APPROVE_OPTION)
        return;

    saver = m_FileChooser.getWriter();
    file = m_FileChooser.getSelectedFile();
    original = getInstances();
    switch (range) {
    case ALL:
        data = original;
        break;

    case SELECTED:
        data = new Instances(original, 0);
        selRows = getSelectedRows();
        for (i = 0; i < selRows.length; i++)
            data.add((Instance) original.instance(getActualRow(selRows[i])).copy());
        break;

    case VISIBLE:
        data = new Instances(original, 0);
        for (i = 0; i < getRowCount(); i++)
            data.add((Instance) original.instance(getActualRow(i)).copy());
        break;

    default:
        throw new IllegalStateException("Unhandled range type: " + range);
    }

    try {
        saver.setFile(file);
        saver.setInstances(data);
        saver.writeBatch();
    } catch (Exception ex) {
        GUIHelper.showErrorMessage(InstancesTable.this, "Failed to save data (" + range + ") to: " + file, ex);
    }
}

---

From source file:adams.opt.optimise.genetic.fitnessfunctions.AttributeSelection.java

License:Open Source License

public double evaluate(OptData opd) {
    init();/* w w  w .j a va 2  s. c  o m*/
    int cnt = 0;
    int[] weights = getWeights(opd);
    Instances newInstances = new Instances(getInstances());
    for (int i = 0; i < getInstances().numInstances(); i++) {
        Instance in = newInstances.instance(i);
        cnt = 0;
        for (int a = 0; a < getInstances().numAttributes(); a++) {
            if (a == getInstances().classIndex())
                continue;
            if (weights[cnt++] == 0) {
                in.setValue(a, 0);
            } else {
                in.setValue(a, in.value(a));
            }
        }
    }
    Classifier newClassifier = null;

    try {
        newClassifier = (Classifier) OptionUtils.shallowCopy(getClassifier());
        // evaluate classifier on data
        Evaluation evaluation = new Evaluation(newInstances);
        evaluation.crossValidateModel(newClassifier, newInstances, getFolds(),
                new Random(getCrossValidationSeed()));

        // obtain measure
        double measure = 0;
        if (getMeasure() == Measure.ACC)
            measure = evaluation.pctCorrect();
        else if (getMeasure() == Measure.CC)
            measure = evaluation.correlationCoefficient();
        else if (getMeasure() == Measure.MAE)
            measure = evaluation.meanAbsoluteError();
        else if (getMeasure() == Measure.RAE)
            measure = evaluation.relativeAbsoluteError();
        else if (getMeasure() == Measure.RMSE)
            measure = evaluation.rootMeanSquaredError();
        else if (getMeasure() == Measure.RRSE)
            measure = evaluation.rootRelativeSquaredError();
        else
            throw new IllegalStateException("Unhandled measure '" + getMeasure() + "'!");
        measure = getMeasure().adjust(measure);

        return (measure);
        // process fitness

    } catch (Exception e) {
        getLogger().log(Level.SEVERE, "Error evaluating", e);
    }

    return 0;
}

---

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