def test_set_backend_with_platform(backend_name):
"""Check ``set_backend`` with ``platform`` argument."""
original_backend = backends.get_backend()
original_platform = K.get_platform()
backends.set_backend(backend_name, platform="test")
current_platform = K.get_platform()
backends.set_backend(original_backend, platform=original_platform)
def assert_gates_equivalent(qibo_gate,
cirq_gates,
nqubits,
ndevices=None,
atol=1e-7):
"""Asserts that QIBO and Cirq gates have equivalent action on a random state.
Args:
qibo_gate: QIBO gate.
cirq_gates: List of tuples (cirq gate, target qubit IDs).
nqubits: Total number of qubits in the circuit.
atol: Absolute tolerance in state vector comparsion.
"""
initial_state = random_state(nqubits)
target_state, target_depth = execute_cirq(cirq_gates, nqubits,
np.copy(initial_state))
accelerators = None
if ndevices is not None:
accelerators = {"/GPU:0": ndevices}
if accelerators:
if not K.supports_multigpu:
with pytest.raises(NotImplementedError):
c = models.Circuit(nqubits, accelerators)
elif K.get_platform() == "numba" and len(
K.available_platforms) > 1: # pragma: no cover
pytest.skip("Skipping distributed cirq test for numba platform.")
else:
c = models.Circuit(nqubits, accelerators)
c.add(qibo_gate)
final_state = c(np.copy(initial_state))
assert c.depth == target_depth
K.assert_allclose(final_state, target_state, atol=atol)
def test_set_backend(backend_name):
"""Check ``set_backend`` for switching gate backends."""
original_backend = backends.get_backend()
backends.set_backend(backend_name)
assert K.name == backend_name
if K.platform is None:
assert str(K) == backend_name
assert repr(K) == backend_name
else:
platform = K.get_platform()
assert str(K) == f"{backend_name} ({platform})"
assert repr(K) == f"{backend_name} ({platform})"
assert K.executing_eagerly()
h = gates.H(0)
backends.set_backend(original_backend)
