def train(self, inputs, targets):
# Generating the hidden outputs
inputs = Matrix.FromArray(inputs)
hidden = Matrix.Multiply(self.weights_ih, inputs)
hidden.addElementWise(self.bias_h)
# Activation here
hidden.map(sigmoid)
# Generating the output outputs
outputs = Matrix.Multiply(self.weights_ho, hidden)
outputs.addElementWise(self.bias_o)
outputs.map(sigmoid)
# Converting array to new Matrix objects
targets = Matrix.FromArray(targets)
# Calculating the errors
output_errors = Matrix.Subtract(targets, outputs)
# Calculate gradient
gradients = Matrix.Map(outputs, derivsigmoid)
gradients.multiplyElementWise(output_errors)
gradients.multiply(self.learningrate)
# Calculate deltas
hidden_t = Matrix.Transpose(hidden)
weights_ho_deltas = Matrix.Multiply(gradients, hidden_t)
# Adjust Hidden -> Output weights
self.weights_ho.addElementWise(weights_ho_deltas)
# Adjust Hidden -> Output bias
self.bias_o.addElementWise(gradients)
# Transposing the hidden-output weights and calculating those errors
weights_ho_t = Matrix.Transpose(self.weights_ho)
hidden_errors = Matrix.Multiply(weights_ho_t, output_errors)
# Caluclate hidden gradient
hidden_gradient = Matrix.Map(hidden, derivsigmoid)
hidden_gradient.multiplyElementWise(hidden_errors)
hidden_gradient.multiply(self.learningrate)
# Calculate hidden deltas
inputs_t = Matrix.Transpose(inputs)
weights_ih_deltas = Matrix.Multiply(hidden_gradient, inputs_t)
# Adjust Input -> Hidden weights
self.weights_ih.addElementWise(weights_ih_deltas)
# Adjust Input -> Hidden bias
self.bias_h.addElementWise(hidden_gradient)
return output_errors
def feedforward(self, input_array):
# Generating the hidden outputs
input = Matrix.FromArray(input_array)
hidden = Matrix.Multiply(self.weights_ih, input)
hidden.addElementWise(self.bias_h)
# Activation here
hidden.map(sigmoid)
# Generating the output outputs
output = Matrix.Multiply(self.weights_ho, hidden)
output.addElementWise(self.bias_o)
output.map(sigmoid)
return output.toArray()
