def test_set_activation(self):
g = Genome(3, 3)
node_ids = range(len(g.get_nodes()))
act = [activations.relu, activations.gaussian, activations.square]
# Test to make sure the activation is set correctly
msg = 'Activation set incorrectly!'
for nid in node_ids:
for a in act:
g.set_activation(nid, a)
self.assertEqual(g.get_node(nid).activation, a)
def test_forward(self):
error_margin = 0.000000000001
g = Genome(2, 2)
x = np.array([0.5, 0.5])
msg = 'Invalid genome output!'
# No connections
y = g(x)
self.assertEqual(y[0], 0.0, msg=msg)
self.assertEqual(y[1], 0.0, msg=msg)
# No hidden nodes, modified sigmoid activation
g.add_connection(0, 2, weight=-0.7)
g.add_connection(0, 3, weight=-0.1)
g.add_connection(1, 2, weight=0.5)
g.add_connection(1, 3, weight=0.9)
y = g(x)
self.assertAlmostEqual(y[0],
0.3798935676569099,
msg=msg,
delta=error_margin)
self.assertAlmostEqual(y[1],
0.8765329524347759,
msg=msg,
delta=error_margin)
# Different activation
for n in g.get_nodes():
if n.type != 'input':
g.set_activation(n.id, activations.absolute)
y = g(x)
self.assertAlmostEqual(y[0], 0.1, msg=msg, delta=error_margin)
self.assertAlmostEqual(y[1], 0.4, msg=msg, delta=error_margin)
# With hidden nodes and different activations (sigmoid for the new ones)
g.add_node(0, activation=activations.sigmoid)
g.add_node(2, activation=activations.sigmoid)
g.add_connection(4, 5, 0.5)
y = g(x)
self.assertAlmostEqual(y[0],
0.08953579350695234,
msg=msg,
delta=error_margin)
self.assertAlmostEqual(y[1], 0.4, msg=msg, delta=error_margin)
# Test with many hidden nodes in a line
g2 = Genome(2, 2)
g2.add_connection(0, 2, -0.3)
g2.add_node(0)
g2.add_node(2)
g2.add_node(4)
g2.add_node(6)
g2.add_connection(1, 7, 0.7)
g2.add_connection(4, 3, -0.2)
y = g2(x)
self.assertAlmostEqual(y[0],
0.18866305913528142,
msg=msg,
delta=error_margin)
self.assertAlmostEqual(y[1],
0.2743863603871294,
msg=msg,
delta=error_margin)
# Test with recursive loop
g3 = Genome(1, 1)
x = np.array([0.5])
g3.add_connection(0, 1, 0.5)
g3.add_node(0)
g3.add_node(0)
g3.add_node(1)
g3.add_connection(3, 2, 0.5)
g3.add_connection(4, 3, 0.5)
y = g3(x)
self.assertAlmostEqual(y[0],
0.9907948306148218,
msg=msg,
delta=error_margin)