@Test public void testGradientWithAsList() { MultiLayerNetwork net1 = new MultiLayerNetwork(getConf()); MultiLayerNetwork net2 = new MultiLayerNetwork(getConf()); net1.init(); net2.init(); DataSet x1 = new IrisDataSetIterator(1, 150).next(); DataSet all = new IrisDataSetIterator(150, 150).next(); DataSet x2 = all.asList().get(0); // x1 and x2 contain identical data assertArrayEquals(asFloat(x1.getFeatureMatrix()), asFloat(x2.getFeatureMatrix()), 0.0f); // OK assertArrayEquals(asFloat(x1.getLabels()), asFloat(x2.getLabels()), 0.0f); // OK assertEquals(x1, x2); // Fails, DataSet doesn't override Object.equals() // Set inputs/outputs so gradient can be calculated: net1.feedForward(x1.getFeatureMatrix()); net2.feedForward(x2.getFeatureMatrix()); ((OutputLayer) net1.getLayers()[1]).setLabels(x1.getLabels()); ((OutputLayer) net2.getLayers()[1]).setLabels(x2.getLabels()); net1.gradient(); // OK net2.gradient(); // IllegalArgumentException: Buffers must fill up specified length 29 }