def _parse_coupling_map(coupling_map, backend, num_circuits):
# try getting coupling_map from user, else backend
if coupling_map is None:
if getattr(backend, 'configuration', None):
configuration = backend.configuration()
if hasattr(configuration, 'coupling_map') and configuration.coupling_map:
faulty_map = _create_faulty_qubits_map(backend)
if faulty_map:
coupling_map = CouplingMap()
for qubit1, qubit2 in configuration.coupling_map:
if faulty_map[qubit1] is not None and faulty_map[qubit2] is not None:
coupling_map.add_edge(faulty_map[qubit1], faulty_map[qubit2])
else:
coupling_map = CouplingMap(configuration.coupling_map)
# coupling_map could be None, or a list of lists, e.g. [[0, 1], [2, 1]]
if coupling_map is None or isinstance(coupling_map, CouplingMap):
coupling_map = [coupling_map] * num_circuits
elif isinstance(coupling_map, list) and all(isinstance(i, list) and len(i) == 2
for i in coupling_map):
coupling_map = [coupling_map] * num_circuits
coupling_map = [CouplingMap(cm) if isinstance(cm, list) else cm for cm in coupling_map]
return coupling_map
def load_coupling_graph(coupling_graph_file_path, num_qubits):
coupling_graph = CouplingMap()
for i in range(num_qubits):
coupling_graph.add_physical_qubit(i)
with open(coupling_graph_file_path, newline='') as coupling_graph_file:
csv_reader = csv.reader(coupling_graph_file)
for source_qubit, destination_qubit in csv_reader:
coupling_graph.add_edge(int(source_qubit), int(destination_qubit))
return coupling_graph
def _parse_coupling_map(coupling_map, backend, num_circuits):
# try getting coupling_map from user, else backend
if coupling_map is None:
backend_version = getattr(backend, "version", 0)
if not isinstance(backend_version, int):
backend_version = 0
if backend_version <= 1:
if getattr(backend, "configuration", None):
configuration = backend.configuration()
if hasattr(configuration,
"coupling_map") and configuration.coupling_map:
faulty_map = _create_faulty_qubits_map(backend)
if faulty_map:
faulty_edges = [
gate.qubits
for gate in backend.properties().faulty_gates()
]
functional_gates = [
edge for edge in configuration.coupling_map
if edge not in faulty_edges
]
coupling_map = CouplingMap()
for qubit1, qubit2 in functional_gates:
if faulty_map[qubit1] is not None and faulty_map[
qubit2] is not None:
coupling_map.add_edge(faulty_map[qubit1],
faulty_map[qubit2])
if configuration.n_qubits != coupling_map.size():
warnings.warn(
"The backend has currently some qubits/edges out of service."
" This temporarily reduces the backend size from "
f"{configuration.n_qubits} to {coupling_map.size()}",
UserWarning,
)
else:
coupling_map = CouplingMap(configuration.coupling_map)
else:
coupling_map = backend.coupling_map
# coupling_map could be None, or a list of lists, e.g. [[0, 1], [2, 1]]
if coupling_map is None or isinstance(coupling_map, CouplingMap):
coupling_map = [coupling_map] * num_circuits
elif isinstance(coupling_map, list) and all(
isinstance(i, list) and len(i) == 2 for i in coupling_map):
coupling_map = [coupling_map] * num_circuits
coupling_map = [
CouplingMap(cm) if isinstance(cm, list) else cm for cm in coupling_map
]
return coupling_map
def generate_coupling_map(environment):
coupling_map = CouplingMap()
a = environment.adjacency_matrix
for i in range(len(a)):
for j in range(len(a[0])):
if a[i][j] == 1:
coupling_map.add_edge(i, j)
coupling_map.add_edge(j, i)
if not coupling_map.is_symmetric:
exit("Qiskit coupling map was not symmetric")
return coupling_map
def _coupling_map(coupling_map, backend):
# try getting coupling_map from user, else backend
if coupling_map is None:
if getattr(backend, 'configuration', None):
configuration = backend.configuration()
if hasattr(configuration, 'coupling_map') and configuration.coupling_map:
faulty_map = _create_faulty_qubits_map(backend)
if faulty_map:
coupling_map = CouplingMap()
for qubit1, qubit2 in configuration.coupling_map:
if faulty_map[qubit1] is not None and faulty_map[qubit2] is not None:
coupling_map.add_edge(faulty_map[qubit1], faulty_map[qubit2])
else:
coupling_map = CouplingMap(configuration.coupling_map)
# coupling_map = [CouplingMap(cm) if isinstance(cm, list) else cm for cm in coupling_map]
return coupling_map
def generate_coupling_map(environment):
"""
Generates the coupling map from the device adjacency matrix
:param environment: environment.environment.Environment, our environment object
:return: list of edges on the device topology (i, j)
"""
coupling_map = CouplingMap()
a = environment.adjacency_matrix
for i in range(len(a)):
for j in range(len(a[0])):
if a[i][j] == 1:
coupling_map.add_edge(i, j)
coupling_map.add_edge(j, i)
if not coupling_map.is_symmetric:
exit("Qiskit coupling map was not symmetric")
return coupling_map
def test_add_edge(self):
coupling = CouplingMap()
self.assertEqual("", str(coupling))
coupling.add_edge(0, 1)
expected = "[[0, 1]]"
self.assertEqual(expected, str(coupling))
