Examples with Nesterovs org.nd4j.linalg.learning.Nesterovs used on opensource projects

Example 1 with Nesterovs

use of org.nd4j.linalg.learning.Nesterovs in project deeplearning4j by deeplearning4j.

the class TestUpdaters method testUpdaters.

@Test
public void testUpdaters() throws Exception {
    ComputationGraphConfiguration conf = new NeuralNetConfiguration.Builder().optimizationAlgo(OptimizationAlgorithm.STOCHASTIC_GRADIENT_DESCENT).updater(Updater.NESTEROVS).momentum(0.9).graphBuilder().addInputs(// 40x40x1
    "input").addLayer("l0_cnn", new ConvolutionLayer.Builder(new int[] { 3, 3 }, new int[] { 1, 1 }, new int[] { 1, 1 }).nOut(100).build(), // out: 40x40x100
    "input").addLayer("l1_max", new SubsamplingLayer.Builder(SubsamplingLayer.PoolingType.MAX, new int[] { 2, 2 }, new int[] { 2, 2 }, new int[] { 1, 1 }).build(), // 21x21x100
    "l0_cnn").addLayer("l2_cnn", new ConvolutionLayer.Builder(new int[] { 3, 3 }, new int[] { 2, 2 }, new int[] { 1, 1 }).nOut(200).build(), // 11x11x200
    "l1_max").addLayer("l3_max", new SubsamplingLayer.Builder(SubsamplingLayer.PoolingType.MAX, new int[] { 3, 3 }, new int[] { 2, 2 }, new int[] { 1, 1 }).build(), // 6x6x200
    "l2_cnn").addLayer("l4_fc", new DenseLayer.Builder().nOut(1024).build(), // output: 1x1x1024
    "l3_max").addLayer("l5_out", new OutputLayer.Builder(LossFunctions.LossFunction.NEGATIVELOGLIKELIHOOD).nOut(10).activation(Activation.SOFTMAX).build(), "l4_fc").setOutputs("l5_out").backprop(true).pretrain(false).setInputTypes(InputType.convolutional(40, 40, 1)).build();
    //First: check that the nIns are set properly...
    Map<String, GraphVertex> map = conf.getVertices();
    LayerVertex l0_cnn = (LayerVertex) map.get("l0_cnn");
    LayerVertex l2_cnn = (LayerVertex) map.get("l2_cnn");
    LayerVertex l4_fc = (LayerVertex) map.get("l4_fc");
    LayerVertex l5_out = (LayerVertex) map.get("l5_out");
    assertEquals(1, ((FeedForwardLayer) l0_cnn.getLayerConf().getLayer()).getNIn());
    assertEquals(100, ((FeedForwardLayer) l2_cnn.getLayerConf().getLayer()).getNIn());
    assertEquals(6 * 6 * 200, ((FeedForwardLayer) l4_fc.getLayerConf().getLayer()).getNIn());
    assertEquals(1024, ((FeedForwardLayer) l5_out.getLayerConf().getLayer()).getNIn());
    //Check updaters state:
    ComputationGraph g = new ComputationGraph(conf);
    g.init();
    g.initGradientsView();
    ComputationGraphUpdater updater = g.getUpdater();
    //First: get the updaters array
    Field layerUpdatersField = updater.getClass().getDeclaredField("layerUpdaters");
    layerUpdatersField.setAccessible(true);
    org.deeplearning4j.nn.api.Updater[] layerUpdaters = (org.deeplearning4j.nn.api.Updater[]) layerUpdatersField.get(updater);
    //And get the map between names and updater indexes
    Field layerUpdatersMapField = updater.getClass().getDeclaredField("layerUpdatersMap");
    layerUpdatersMapField.setAccessible(true);
    Map<String, Integer> layerUpdatersMap = (Map<String, Integer>) layerUpdatersMapField.get(updater);
    //Go through each layer; check that the updater state size matches the parameters size
    org.deeplearning4j.nn.api.Layer[] layers = g.getLayers();
    for (org.deeplearning4j.nn.api.Layer l : layers) {
        String layerName = l.conf().getLayer().getLayerName();
        int nParams = l.numParams();
        Map<String, INDArray> paramTable = l.paramTable();
        Map<String, Integer> parameterSizeCounts = new LinkedHashMap<>();
        for (Map.Entry<String, INDArray> e : paramTable.entrySet()) {
            parameterSizeCounts.put(e.getKey(), e.getValue().length());
        }
        int updaterIdx = layerUpdatersMap.get(layerName);
        org.deeplearning4j.nn.api.Updater u = layerUpdaters[updaterIdx];
        LayerUpdater lu = (LayerUpdater) u;
        Field updaterForVariableField = LayerUpdater.class.getDeclaredField("updaterForVariable");
        updaterForVariableField.setAccessible(true);
        Map<String, GradientUpdater> updaterForVariable = (Map<String, GradientUpdater>) updaterForVariableField.get(lu);
        Map<String, Integer> updaterStateSizeCounts = new HashMap<>();
        for (Map.Entry<String, GradientUpdater> entry : updaterForVariable.entrySet()) {
            GradientUpdater gu = entry.getValue();
            Nesterovs nesterovs = (Nesterovs) gu;
            INDArray v = nesterovs.getV();
            int length = (v == null ? -1 : v.length());
            updaterStateSizeCounts.put(entry.getKey(), length);
        }
        //Check subsampling layers:
        if (l.numParams() == 0) {
            assertEquals(0, updaterForVariable.size());
        }
        System.out.println(layerName + "\t" + nParams + "\t" + parameterSizeCounts + "\t Updater size: " + updaterStateSizeCounts);
        //Now, with nesterov updater: 1 history value per parameter
        for (String s : parameterSizeCounts.keySet()) {
            int paramSize = parameterSizeCounts.get(s);
            int updaterSize = updaterStateSizeCounts.get(s);
            assertEquals(layerName + "/" + s, paramSize, updaterSize);
        }
    }
    //minibatch, depth, height, width
    INDArray in = Nd4j.create(2, 1, 40, 40);
    INDArray l = Nd4j.create(2, 10);
    DataSet ds = new DataSet(in, l);
    g.fit(ds);
}