Examples with LaplacianEigenmap smile.manifold.LaplacianEigenmap used on opensource projects

Example 1 with LaplacianEigenmap

use of smile.manifold.LaplacianEigenmap in project smile by haifengl.

the class LaplacianEigenmapDemo method learn.

@Override
public JComponent learn() {
    JPanel pane = new JPanel(new GridLayout(1, 2));
    try {
        sigma = Double.parseDouble(sigmaField.getText().trim());
    } catch (Exception ex) {
        JOptionPane.showMessageDialog(this, "Invalid t: " + sigmaField.getText(), "Error", JOptionPane.ERROR_MESSAGE);
        return pane;
    }
    sigmaField.setEnabled(false);
    double[][] data = dataset[datasetIndex].toArray(new double[dataset[datasetIndex].size()][]);
    if (data.length > 1000) {
        double[][] x = new double[1000][];
        for (int i = 0; i < 1000; i++) {
            x[i] = data[i];
        }
        data = x;
    }
    long clock = System.currentTimeMillis();
    LaplacianEigenmap eigenmap = new LaplacianEigenmap(data, 2, k, sigma);
    System.out.format("Learn Laplacian Eigenmap from %d samples in %dms\n", data.length, System.currentTimeMillis() - clock);
    double[][] y = eigenmap.getCoordinates();
    PlotCanvas plot = new PlotCanvas(Math.colMin(y), Math.colMax(y));
    plot.points(y, 'o', Color.RED);
    int n = y.length;
    Graph graph = eigenmap.getNearestNeighborGraph();
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < i; j++) {
            if (graph.hasEdge(i, j)) {
                plot.line(y[i], y[j]);
            }
        }
    }
    plot.setTitle("Laplacian Eigenmap");
    pane.add(plot);
    sigmaField.setEnabled(true);
    return pane;
}