def setUp(self):
self.K_stable = 10
# setup a 2-node graph
G = nx.Graph()
G.add_edge(1, 2, weight=self.K_stable)
inputs = {1: 1, 2: -1}
self.two_node_net = KuramotoNetwork(G, inputs, weight='weight')
# setup a ring network with inputs -1 +1 -1 +1...
self.ring_size = 8
ring_graph = nx.cycle_graph(self.ring_size)
for u, v in ring_graph.edges():
ring_graph[u][v]['weight'] = self.K_stable
inputs = {
node: (node % 2 - 0.5) * 2
for node in np.arange(self.ring_size)
}
self.ring_net_even = KuramotoNetwork(ring_graph,
inputs,
weight='weight')
# setup a ring network with inputs +1 +1 +1 +1 -1 -1 -1 -1 ...
inputs = {
node: (int(node < self.ring_size / 2) - 0.5) * 2
for node in np.arange(self.ring_size)
}
self.ring_net_odd = KuramotoNetwork(ring_graph,
inputs,
weight='weight')
def setUp(self):
self.K_stable = 10
# setup a 2-node graph
G = nx.Graph()
G.add_edge(1, 2, weight=self.K_stable)
inputs = {1: 1, 2: -1}
self.two_node_net = KuramotoNetwork(G, inputs, weight='weight')
# setup a ring network with inputs -1 +1 -1 +1...
self.ring_size = 8
ring_graph = nx.cycle_graph(self.ring_size)
for u, v in ring_graph.edges():
ring_graph[u][v]['weight'] = self.K_stable
inputs = {
node: (node % 2 - 0.5) * 2 for node in np.arange(self.ring_size)}
self.ring_net_even = KuramotoNetwork(
ring_graph, inputs, weight='weight')
# setup a ring network with inputs +1 +1 +1 +1 -1 -1 -1 -1 ...
inputs = {node: (int(node < self.ring_size / 2) - 0.5)
* 2 for node in np.arange(self.ring_size)}
self.ring_net_odd = KuramotoNetwork(
ring_graph, inputs, weight='weight')
class TestCore:
def setUp(self):
self.K_stable = 10
# setup a 2-node graph
G = nx.Graph()
G.add_edge(1, 2, weight=self.K_stable)
inputs = {1: 1, 2: -1}
self.two_node_net = KuramotoNetwork(G, inputs, weight='weight')
# setup a ring network with inputs -1 +1 -1 +1...
self.ring_size = 8
ring_graph = nx.cycle_graph(self.ring_size)
for u, v in ring_graph.edges():
ring_graph[u][v]['weight'] = self.K_stable
inputs = {
node: (node % 2 - 0.5) * 2 for node in np.arange(self.ring_size)}
self.ring_net_even = KuramotoNetwork(
ring_graph, inputs, weight='weight')
# setup a ring network with inputs +1 +1 +1 +1 -1 -1 -1 -1 ...
inputs = {node: (int(node < self.ring_size / 2) - 0.5)
* 2 for node in np.arange(self.ring_size)}
self.ring_net_odd = KuramotoNetwork(
ring_graph, inputs, weight='weight')
# Test fixed points for simple networks
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_2node_fixed_point(self, dK):
"""Fixed point should be 1"""
for u, v in self.two_node_net.edges():
self.two_node_net[u][v]['weight'] = 1+dK
fp_2node, data = self.two_node_net.steady_flows(
initguess=np.array([0, 0]))
assert_almost_equal(fp_2node[(1, 2)], 1, places=4)
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_even_ring_fixed_point(self, dK):
"""The flows should look like -0.5 0.5 -0.5 0.5..."""
for u, v in self.ring_net_even.edges():
self.ring_net_even[u][v]['weight'] = 0.5 + dK
fp_ring, data = self.ring_net_even.steady_flows(initguess=np.zeros(
self.ring_net_even.number_of_nodes()))
assert(np.allclose([flow - (u % 2 - 0.5)
for (u, v), flow in fp_ring.items()], 0, atol=1e-6))
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_odd_ring_fixed_point(self, dK):
"""The flows should look like 1 -1 1 -1 ..."""
for u, v in self.ring_net_odd.edges():
self.ring_net_odd[u][v]['weight'] = self.ring_size/4 + dK
nnodes = self.ring_net_odd.number_of_nodes()
fp_ring, data = self.ring_net_odd.steady_flows(
initguess=np.zeros(nnodes))
fp_ring_array = [fp_ring[(i, (i + 1) % nnodes)] for i in range(nnodes)]
fp_exact_array = [-1, 0, 1, 2, 1, 0, -1, -2]
assert(np.allclose(fp_ring_array, fp_exact_array, atol=1e-6))
# Test that no fixed point below critical coupling
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_2node_unstable(self, dK):
for u, v in self.two_node_net.edges():
self.two_node_net[u][v]['weight'] = 1 - dK
fp, data = self.two_node_net.steady_flows(
initguess=np.array([0, 0]))
assert_is_none(fp)
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_even_ring_unstable(self, dK):
for u, v in self.ring_net_even.edges():
self.ring_net_even[u][v]['weight'] = 0.5 - dK
fp, data = self.ring_net_even.steady_flows()
assert_is_none(fp)
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_odd_ring_unstable(self, dK):
for u, v in self.ring_net_odd.edges():
self.ring_net_odd[u][v]['weight'] = self.ring_size/4 - dK
fp, data = self.ring_net_odd.steady_flows()
assert_is_none(fp)
class TestCore:
def setUp(self):
self.K_stable = 10
# setup a 2-node graph
G = nx.Graph()
G.add_edge(1, 2, weight=self.K_stable)
inputs = {1: 1, 2: -1}
self.two_node_net = KuramotoNetwork(G, inputs, weight='weight')
# setup a ring network with inputs -1 +1 -1 +1...
self.ring_size = 8
ring_graph = nx.cycle_graph(self.ring_size)
for u, v in ring_graph.edges():
ring_graph[u][v]['weight'] = self.K_stable
inputs = {
node: (node % 2 - 0.5) * 2
for node in np.arange(self.ring_size)
}
self.ring_net_even = KuramotoNetwork(ring_graph,
inputs,
weight='weight')
# setup a ring network with inputs +1 +1 +1 +1 -1 -1 -1 -1 ...
inputs = {
node: (int(node < self.ring_size / 2) - 0.5) * 2
for node in np.arange(self.ring_size)
}
self.ring_net_odd = KuramotoNetwork(ring_graph,
inputs,
weight='weight')
# Test fixed points for simple networks
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_2node_fixed_point(self, dK):
"""Fixed point should be 1"""
for u, v in self.two_node_net.edges():
self.two_node_net[u][v]['weight'] = 1 + dK
fp_2node, data = self.two_node_net.steady_flows(initguess=np.array(
[0, 0]),
extra_output=True)
assert_almost_equal(fp_2node[(1, 2)], 1, places=4)
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_even_ring_fixed_point(self, dK):
"""The flows should look like -0.5 0.5 -0.5 0.5..."""
for u, v in self.ring_net_even.edges():
self.ring_net_even[u][v]['weight'] = 0.5 + dK
fp_ring, data = self.ring_net_even.steady_flows(initguess=np.zeros(
self.ring_net_even.number_of_nodes()),
extra_output=True)
assert (np.allclose(
[flow - (u % 2 - 0.5) for (u, v), flow in fp_ring.items()],
0,
atol=1e-6))
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_odd_ring_fixed_point(self, dK):
"""The flows should look like 1 -1 1 -1 ..."""
for u, v in self.ring_net_odd.edges():
self.ring_net_odd[u][v]['weight'] = self.ring_size / 4 + dK
nnodes = self.ring_net_odd.number_of_nodes()
fp_ring, data = self.ring_net_odd.steady_flows(
initguess=np.zeros(nnodes), extra_output=True)
fp_ring_array = [fp_ring[(i, (i + 1) % nnodes)] for i in range(nnodes)]
fp_exact_array = [-1, 0, 1, 2, 1, 0, -1, -2]
assert (np.allclose(fp_ring_array, fp_exact_array, atol=1e-6))
# Test that no fixed point below critical coupling
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_2node_unstable(self, dK):
for u, v in self.two_node_net.edges():
self.two_node_net[u][v]['weight'] = 1 - dK
fp, data = self.two_node_net.steady_flows(initguess=np.array([0, 0]),
extra_output=True)
assert_is_none(fp)
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_even_ring_unstable(self, dK):
for u, v in self.ring_net_even.edges():
self.ring_net_even[u][v]['weight'] = 0.5 - dK
fp, data = self.ring_net_even.steady_flows(extra_output=True)
assert_is_none(fp)
@given(st.floats(min_value=0.0001, max_value=0.1))
def test_odd_ring_unstable(self, dK):
for u, v in self.ring_net_odd.edges():
self.ring_net_odd[u][v]['weight'] = self.ring_size / 4 - dK
fp, data = self.ring_net_odd.steady_flows(extra_output=True)
assert_is_none(fp)
