Example usage for weka.core Instances numInstances

List of usage examples for weka.core Instances numInstances

  1. HOME
  2. Java
  3. weka
  4. weka.core.*
  5. Instances
  6. numInstances

Introduction

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

Prototype


publicint numInstances()

Source Link

Document

Returns the number of instances in the dataset.

Usage

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

License:Open Source License

/**
 * Executes the flow item./*from w  ww .j  a v  a  2 s .com*/
 *
 * @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;
}

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

License:Open Source License

/**
 * Executes the flow item./*from w ww. j a  va 2s  .c o m*/
 *
 * @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.menu.CostCurve.java

License:Open Source License

/**
 * Launches the functionality of the menu item.
 *//*from w  w  w  .jav  a  2  s .c  o m*/
@Override
public void launch() {
    File file;
    if (m_Parameters.length == 0) {
        // choose file
        int retVal = m_FileChooser.showOpenDialog(null);
        if (retVal != JFileChooser.APPROVE_OPTION)
            return;
        file = m_FileChooser.getSelectedFile();
    } else {
        file = new PlaceholderFile(m_Parameters[0]).getAbsoluteFile();
        m_FileChooser.setSelectedFile(file);
    }

    // create plot
    Instances result;
    try {
        result = m_FileChooser.getLoader().getDataSet();
    } catch (Exception e) {
        GUIHelper.showErrorMessage(getOwner(),
                "Error loading file '" + file + "':\n" + adams.core.Utils.throwableToString(e));
        return;
    }
    result.setClassIndex(result.numAttributes() - 1);
    ThresholdVisualizePanel vmc = new ThresholdVisualizePanel();
    PlotData2D plot = new PlotData2D(result);
    plot.setPlotName(result.relationName());
    plot.m_displayAllPoints = true;
    boolean[] connectPoints = new boolean[result.numInstances()];
    for (int cp = 1; cp < connectPoints.length; cp++)
        connectPoints[cp] = true;
    try {
        plot.setConnectPoints(connectPoints);
        vmc.addPlot(plot);
    } catch (Exception e) {
        GUIHelper.showErrorMessage(getOwner(), "Error adding plot:\n" + adams.core.Utils.throwableToString(e));
        return;
    }

    ChildFrame frame = createChildFrame(vmc, GUIHelper.getDefaultDialogDimension());
    frame.setTitle(frame.getTitle() + " - " + file);
}

From source file:adams.gui.menu.MarginCurve.java

License:Open Source License

/**
 * Launches the functionality of the menu item.
 *///  ww w .j  a v  a2 s .  co m
@Override
public void launch() {
    File file;
    if (m_Parameters.length == 0) {
        // choose file
        int retVal = m_FileChooser.showOpenDialog(null);
        if (retVal != JFileChooser.APPROVE_OPTION)
            return;
        file = m_FileChooser.getSelectedFile();
    } else {
        file = new PlaceholderFile(m_Parameters[0]).getAbsoluteFile();
        m_FileChooser.setSelectedFile(file);
    }

    // create plot
    Instances result;
    try {
        result = m_FileChooser.getLoader().getDataSet();
    } catch (Exception e) {
        GUIHelper.showErrorMessage(getOwner(),
                "Error loading file '" + file + "':\n" + adams.core.Utils.throwableToString(e));
        return;
    }
    result.setClassIndex(result.numAttributes() - 1);
    VisualizePanel vp = new VisualizePanel();
    PlotData2D plot = new PlotData2D(result);
    plot.m_displayAllPoints = true;
    boolean[] connectPoints = new boolean[result.numInstances()];
    for (int cp = 1; cp < connectPoints.length; cp++)
        connectPoints[cp] = true;
    try {
        plot.setConnectPoints(connectPoints);
        vp.addPlot(plot);
    } catch (Exception e) {
        GUIHelper.showErrorMessage(getOwner(), "Error adding plot:\n" + adams.core.Utils.throwableToString(e));
        return;
    }

    ChildFrame frame = createChildFrame(vp, GUIHelper.getDefaultDialogDimension());
    frame.setTitle(frame.getTitle() + " - " + file);
}

From source file:adams.gui.menu.ROC.java

License:Open Source License

/**
 * Launches the functionality of the menu item.
 *///w  w  w.ja  va  2 s.  co  m
@Override
public void launch() {
    File file;
    if (m_Parameters.length == 0) {
        // choose file
        int retVal = m_FileChooser.showOpenDialog(null);
        if (retVal != JFileChooser.APPROVE_OPTION)
            return;
        file = m_FileChooser.getSelectedFile();
    } else {
        file = new PlaceholderFile(m_Parameters[0]).getAbsoluteFile();
        m_FileChooser.setSelectedFile(file);
    }

    // create plot
    Instances result;
    try {
        result = m_FileChooser.getLoader().getDataSet();
    } catch (Exception e) {
        GUIHelper.showErrorMessage(getOwner(),
                "Error loading file '" + file + "':\n" + adams.core.Utils.throwableToString(e));
        return;
    }
    result.setClassIndex(result.numAttributes() - 1);
    ThresholdVisualizePanel vmc = new ThresholdVisualizePanel();
    vmc.setROCString("(Area under ROC = " + Utils.doubleToString(ThresholdCurve.getROCArea(result), 4) + ")");
    vmc.setName(result.relationName());
    PlotData2D tempd = new PlotData2D(result);
    tempd.setPlotName(result.relationName());
    tempd.addInstanceNumberAttribute();
    // specify which points are connected
    boolean[] cp = new boolean[result.numInstances()];
    for (int n = 1; n < cp.length; n++)
        cp[n] = true;
    try {
        tempd.setConnectPoints(cp);
        vmc.addPlot(tempd);
    } catch (Exception e) {
        GUIHelper.showErrorMessage(getOwner(), "Error adding plot:\n" + adams.core.Utils.throwableToString(e));
        return;
    }

    ChildFrame frame = createChildFrame(vmc, GUIHelper.getDefaultDialogDimension());
    frame.setTitle(frame.getTitle() + " - " + file);
}

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

License:Open Source License

/**
 * Creates the actual view.// ww w  .ja va 2s .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.debug.inspectionhandler.WekaInstances.java

License:Open Source License

/**
 * Returns further inspection values.//from   w w  w  .  j av  a 2 s  .  c o  m
 *
 * @param obj      the object to further inspect
 * @return      the named inspected values
 */
@Override
public Hashtable<String, Object> inspect(Object obj) {
    Hashtable<String, Object> result;
    Instances data;
    Instance inst;

    result = new Hashtable<String, Object>();

    if (obj instanceof Instances) {
        data = (Instances) obj;
        inst = null;
    } else {
        inst = (Instance) obj;
        data = inst.dataset();
    }

    result.put("relation", data.relationName());
    result.put("num attributes", data.numAttributes());
    result.put("class attribute", (data.classIndex() == -1) ? "-none-"
            : ((data.classIndex() + 1) + " (" + data.classAttribute().name() + ")"));
    if (inst == null) {
        result.put("num instances", data.numInstances());
        result.put("instances", data.toArray());
    }

    return result;
}

From source file:adams.gui.visualization.debug.objectrenderer.WekaInstancesRenderer.java

License:Open Source License

/**
 * Performs the actual rendering.//from ww  w  . j  a  v a  2 s  .co m
 *
 * @param obj      the object to render
 * @param panel   the panel to render into
 * @return      null if successful, otherwise error message
 */
@Override
protected String doRender(Object obj, JPanel panel) {
    Instance inst;
    Instances data;
    InstancesTable table;
    InstancesTableModel model;
    BaseScrollPane scrollPane;
    PlainTextRenderer plain;
    SpreadSheet sheet;
    Row row;
    int i;
    SpreadSheetRenderer sprenderer;

    if (obj instanceof Instances) {
        data = (Instances) obj;
        if (data.numInstances() == 0) {
            sheet = new DefaultSpreadSheet();
            row = sheet.getHeaderRow();
            row.addCell("I").setContentAsString("Index");
            row.addCell("N").setContentAsString("Name");
            row.addCell("T").setContentAsString("Type");
            row.addCell("C").setContentAsString("Class");
            for (i = 0; i < data.numAttributes(); i++) {
                row = sheet.addRow();
                row.addCell("I").setContent(i + 1);
                row.addCell("N").setContentAsString(data.attribute(i).name());
                row.addCell("T").setContentAsString(Attribute.typeToString(data.attribute(i)));
                row.addCell("C").setContent((i == data.classIndex()) ? "true" : "");
            }
            sprenderer = new SpreadSheetRenderer();
            sprenderer.render(sheet, panel);
        } else {
            model = new InstancesTableModel(data);
            model.setShowAttributeIndex(true);
            table = new InstancesTable(model);
            scrollPane = new BaseScrollPane(table);
            panel.add(scrollPane, BorderLayout.CENTER);
        }
    } else {
        inst = (Instance) obj;
        if (inst.dataset() != null) {
            data = new Instances(inst.dataset(), 0);
            data.add((Instance) inst.copy());
            table = new InstancesTable(data);
            scrollPane = new BaseScrollPane(table);
            panel.add(scrollPane, BorderLayout.CENTER);
        } else {
            plain = new PlainTextRenderer();
            plain.render(obj, panel);
        }
    }

    return null;
}

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

License:Open Source License

/**
 * pops up SQL Viewer for SQL statement.
 *//*  w  w  w  .j a  va 2  s.  c o  m*/
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 w w.j  a  v a 2 s .co  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);
}