public void AddNeuron_should_return_new_neuron()
{
// Arrange
Layer layer = new Layer();
// Act
PeceptronNeuron peceptron1 = layer.AddNeuron();
PeceptronNeuron peceptron2 = layer.AddNeuron();
// Assert
Assert.That(peceptron1, Is.Not.EqualTo(peceptron2));
}
public void AddNeuron_should_add_neuron_to_layer()
{
// Arrange
Layer layer = new Layer();
// Act
layer.AddNeuron();
layer.AddNeuron();
// Assert
Assert.That(layer.Neurons.Count, Is.EqualTo(2));
}
public void UpdateNextLayer_should_link_neurons_to_next_layer()
{
// Arrange
Layer layer1 = new Layer();
layer1.AddNeuron();
layer1.AddNeuron();
Layer layer2 = new Layer();
layer2.AddNeuron();
layer2.AddNeuron();
// Act
layer1.SetNextLayer(layer2);
layer1.UpdateNextLayer();
// Assert
Assert.That(layer2.Neurons[0].Inputs.Count(), Is.EqualTo(2));
Assert.That(layer2.Neurons[1].Inputs.Count(), Is.EqualTo(2));
}
public void UpdateNextLayer_should_update_inputs_in_next_layer_with_previous_layer_sigmoid_totals()
{
// Arrange
Layer layer1 = new Layer();
PeceptronNeuron layer1Neuron1 = layer1.AddNeuron(new Input(5, 1));
PeceptronNeuron layer1Neuron2 = layer1.AddNeuron(new Input(5, 1));
double expectedNeuron1Sum = layer1Neuron1.SigmoidTotal(layer1Neuron1.SumInputs()) * 2; // as there's 2 neurons pointing to the next layer,
double expectedNeuron2Sum = layer1Neuron2.SigmoidTotal(layer1Neuron2.SumInputs()) * 2;
Layer layer2 = new Layer();
PeceptronNeuron layer2Neuron1 = layer2.AddNeuron();
PeceptronNeuron layer2Neuron2 = layer2.AddNeuron();
// Act
layer1.SetNextLayer(layer2);
layer1.UpdateNextLayer();
// Assert
Assert.That(layer2Neuron1.SumInputs(), Is.EqualTo(expectedNeuron1Sum));
Assert.That(layer2Neuron2.SumInputs(), Is.EqualTo(expectedNeuron2Sum));
}
public void SetNextLayer_should_set_nextlayer_property_to_provided_layer()
{
// Arrange
Layer layer1 = new Layer();
layer1.AddNeuron();
Layer layer2 = new Layer();
layer2.AddNeuron();
// Act
layer1.SetNextLayer(layer2);
// Assert
Assert.That(layer1.NextLayer, Is.EqualTo(layer2));
}
public void AddNeuron_should_add_weights_and_values_to_neurons()
{
// Arrange
Layer layer = new Layer();
// Act
PeceptronNeuron peceptron = layer.AddNeuron(new Input(10, 20), new Input(33, 44));
// Assert
List <Input> inputs = peceptron.Inputs.ToList();
Assert.That(inputs[0].Value, Is.EqualTo(10));
Assert.That(inputs[0].Weight, Is.EqualTo(20));
Assert.That(inputs[1].Value, Is.EqualTo(33));
Assert.That(inputs[1].Weight, Is.EqualTo(44));
}
public void AddNeuron_HandlesNull()
{
TestDelegate func = () => layer.AddNeuron(null);
Assert.Throws <ArgumentNullException>(func);
}
