public static DataSet mnist(int num) {
try {
MnistDataFetcher fetcher = new MnistDataFetcher();
fetcher.fetch(num);
return fetcher.next();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Test
public void testWithMnist() throws Exception {
MnistDataFetcher fetcher = new MnistDataFetcher(true);
fetcher.fetch(200);
DataSet data = fetcher.next();
data.filterAndStrip(new int[] {0, 1});
log.info("Training on " + data.numExamples());
DBN dbn =
new DBN.Builder()
.hiddenLayerSizes(new int[] {1000, 500, 250, 10})
.numberOfInputs(784)
.numberOfOutPuts(2)
.build();
dbn.pretrain(data.getFirst(), new Object[] {1, 1e-1, 10000});
DeepAutoEncoder encoder = new DeepAutoEncoder(dbn);
encoder.finetune(data.getFirst(), 1e-3, 1000);
DoubleMatrix reconstruct = encoder.reconstruct(data.getFirst());
for (int j = 0; j < data.numExamples(); j++) {
DoubleMatrix draw1 = data.get(j).getFirst().mul(255);
DoubleMatrix reconstructed2 = reconstruct.getRow(j);
DoubleMatrix draw2 = reconstructed2.mul(255);
DrawMnistGreyScale d = new DrawMnistGreyScale(draw1);
d.title = "REAL";
d.draw();
DrawMnistGreyScale d2 = new DrawMnistGreyScale(draw2);
d2.title = "TEST";
d2.draw();
Thread.sleep(10000);
d.frame.dispose();
d2.frame.dispose();
}
}