c.getWeights()[15] = 4;
Matrix i1 = new Matrix(new float[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 }, 1);
ValuesProvider vp = new ValuesProvider();
vp.addValues(nn.getInputLayer(), i1);
Set<Layer> calculatedLayers = new HashSet<>();
calculatedLayers.add(nn.getInputLayer());
nn.getLayerCalculator().calculate(nn, nn.getOutputLayer(), calculatedLayers, vp);