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Remove unused flag from AbstractCircuit class #463

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Sep 10, 2021
Merged

Remove unused flag from AbstractCircuit class #463

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26 changes: 13 additions & 13 deletions src/qibo/abstractions/circuit.py
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Original file line number Diff line number Diff line change
Expand Up @@ -63,12 +63,13 @@ class AbstractCircuit(ABC):
All backend-based circuits should inherit ``AbstractCircuit``.
Qibo provides the following circuits:
A state vector simulation circuit:
:class:`qibo.core.circuit.Circuit`,
a density matrix simulation circuit:
:class:`qibo.core.circuit.DensityMatrixCircuit`
and a circuit that distributes state vector simulation on multiple devices:
:class:`qibo.core.distcircuit.DistributedCircuit`.
* A state vector simulation circuit:
:class:`qibo.core.circuit.Circuit`.
* A density matrix simulation circuit:
:class:`qibo.core.circuit.DensityMatrixCircuit`.
* A circuit that distributes state vector simulation on multiple devices:
:class:`qibo.core.distcircuit.DistributedCircuit`.
All circuits use core as the computation backend.
Args:
Expand All @@ -88,9 +89,6 @@ def __init__(self, nqubits):
# Keep track of parametrized gates for the ``set_parameters`` method
self.parametrized_gates = _ParametrizedGates()
self.trainable_gates = _ParametrizedGates()
# Flag to keep track if the circuit was executed
# We do not allow adding gates in an executed circuit
self.is_executed = False

self.measurement_tuples = dict()
self.measurement_gate = None
Expand Down Expand Up @@ -236,7 +234,7 @@ def invert(self):
return new_circuit

def _check_noise_map(self, noise_map: NoiseMapType) -> NoiseMapType:
if isinstance(noise_map, tuple) or isinstance(noise_map, list):
if isinstance(noise_map, (tuple, list)):
if len(noise_map) != 3:
raise_error(ValueError, "Noise map expects three probabilities "
"but received {}.".format(len(noise_map)))
Expand Down Expand Up @@ -431,7 +429,7 @@ def _add_measurement(self, gate: gates.Gate):
This is because measurement gates (`gates.M`) are treated differently
than all other gates.
The user is not supposed to use the `add_measurement` method.
The user is not supposed to use the `_add_measurement` method.
"""
# Set register's name and log the set of qubits in `self.measurement_tuples`
name = gate.register_name
Expand All @@ -452,7 +450,9 @@ def _add_measurement(self, gate: gates.Gate):

@abstractmethod
def _add_layer(self, gate: gates.Gate): # pragma: no cover
"""Called automatically by `add` when `gate` is measurement."""
"""Called automatically by `add` when `gate` is of
type `qibo.abstractions.gates.VariationalLayer`.
"""
raise_error(NotImplementedError)

@property
Expand Down Expand Up @@ -1028,7 +1028,7 @@ def chunkstring(string, length):
break
for i, c in enumerate(chunks):
loutput += ['' for _ in range(self.nqubits)]
suffix = f' ...\n'
suffix = ' ...\n'
prefix = f'q{row}' + ' ' * (len(str(self.nqubits))-len(str(row))) + ': '
if i == 0:
prefix += ' ' * 4
Expand Down