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Addressed Doug's comments
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@verult
verult committed Apr 28, 2022
1 parent 5c75527 commit c8743b6
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Showing 4 changed files with 72 additions and 59 deletions.
2 changes: 1 addition & 1 deletion cirq-core/cirq/devices/grid_device_metadata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -170,6 +170,6 @@ def _from_json_dict_(cls, qubit_pairs, gateset, gate_durations, all_qubits, **kw
return cls(
qubit_pairs,
gateset,
None if gate_durations is None else dict(gate_durations),
dict(gate_durations) if gate_durations is not None else None,
all_qubits,
)
1 change: 1 addition & 0 deletions cirq-google/cirq_google/api/v2/device.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ message DeviceSpecification {
// A list of allowed ids for qubits within the Program.
// Any programs with ids not in this list will be rejected.
// If empty, all qubit values are allowed (e.g. in a simulator)
// Only grid qubits are supported. Strings must be in the form '<int>_<int>'.
repeated string valid_qubits = 2;

// A list of targets that gates can use.
Expand Down
95 changes: 47 additions & 48 deletions cirq-google/cirq_google/devices/grid_device.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@

"""Device object representing Google devices with a grid qubit layout."""

import re

from typing import Any, Set, Tuple, cast
import cirq
from cirq_google.api import v2
Expand All @@ -27,9 +29,16 @@ def _validate_device_specification(proto: v2.device_pb2.DeviceSpecification) ->
Raises:
ValueError: If the DeviceSpecification is invalid.
"""

# Qubit names must be in the form <int>_<int> to be parsed as cirq.GridQubits.
for q_name in proto.valid_qubits:
if re.match('^[0-9]+\_[0-9]+$', q_name) is None:
raise ValueError(
f"Invalid DeviceSpecification: valid_qubits contains the qubit '{q_name}' which is"
" not in the GridQubit form '<int>_<int>."
)

for target_set in proto.valid_targets:

# Check for unknown qubits in targets.
Expand Down Expand Up @@ -79,16 +88,16 @@ class GridDevice(cirq.Device):
Example use cases:
* Get an instance of a Google grid device.
>>> device = cirq_google.get_engine().get_processor('weber').get_device()
>>> device = cirq_google.get_engine().get_processor('processor_name').get_device()
* Print the grid layout of the device.
>>> print(device)
* Determine whether a circuit can be run on the device.
>>> device.validate_circuit(circuit) # Raises an exception if the circuit is invalid.
>>> device.validate_circuit(circuit) # Raises a ValueError if the circuit is invalid.
* Determine whether an operation can be run on the device.
>>> device.validate_operation(operation) # Raises an exception if the operation is invalid.
>>> device.validate_operation(operation) # Raises a ValueError if the operation is invalid.
* Get the `cirq.Gateset` containing valid gates for the device, and inspect the full list
of valid gates.
Expand Down Expand Up @@ -116,7 +125,7 @@ class GridDevice(cirq.Device):
For Google devices, the
[DeviceSpecification proto](
https://github.com/quantumlib/Cirq/blob/3969c2d3964cea56df33b329f036ba6810683882/cirq-google/cirq_google/api/v2/device.proto#L13
https://github.com/quantumlib/Cirq/blob/master/cirq-google/cirq_google/api/v2/device.proto
)
is the main specification for device information surfaced by the Quantum Computing Service.
Thus, this class is should be instantiated using a `DeviceSpecification` proto via the
Expand All @@ -134,21 +143,29 @@ def __init__(self, metadata: cirq.GridDeviceMetadata):
def from_proto(cls, proto: v2.device_pb2.DeviceSpecification) -> 'GridDevice':
"""Create a `GridDevice` from a DeviceSpecification proto.
This class only supports `cirq.GridQubit`s and `cirq.NamedQubit`s. If a
`DeviceSpecification.valid_qubits` string is in the form `<int>_<int>`, it is parsed as a
GridQubit. Otherwise it is parsed as a NamedQubit.
Args:
proto: The `DeviceSpecification` proto describing a Google device.
Raises:
ValueError: If the given `DeviceSpecification` is invalid.
ValueError: If the given `DeviceSpecification` is invalid. It is invalid if:
* A `DeviceSpecification.valid_qubits` string is not in the form `<int>_<int>`, thus
cannot be parsed as a `cirq.GridQubit`.
* `DeviceSpecification.valid_targets` refer to qubits which are not in
`DeviceSpecification.valid_qubits`.
* A target set in `DeviceSpecification.valid_targets` has type `SYMMETRIC` or
`ASYMMETRIC` but contains targets with repeated qubits, e.g. a qubit pair with a
self loop.
* A target set in `DeviceSpecification.valid_targets` has type `SUBSET_PERMUTATION`
but contains targets which do not have exactly one element. A `SUBSET_PERMUTATION`
target set uses each target to represent a single qubit, and a gate can apply to
any subset of qubits in the target set.
"""

_validate_device_specification(proto)

# Create qubit set
all_qubits = [_qid_from_str(q) for q in proto.valid_qubits]
all_qubits = [v2.grid_qubit_from_proto_id(q) for q in proto.valid_qubits]

# Create qubit pair set
#
Expand All @@ -159,7 +176,7 @@ def from_proto(cls, proto: v2.device_pb2.DeviceSpecification) -> 'GridDevice':
# * Measurement gate can always be applied to all subset of qubits.
#
qubit_pairs = [
(_qid_from_str(target.ids[0]), _qid_from_str(target.ids[1]))
(v2.grid_qubit_from_proto_id(target.ids[0]), v2.grid_qubit_from_proto_id(target.ids[1]))
for ts in proto.valid_targets
for target in ts.targets
if len(target.ids) == 2 and ts.target_ordering == v2.device_pb2.TargetSet.SYMMETRIC
Expand Down Expand Up @@ -212,36 +229,30 @@ def validate_operation(self, operation: cirq.Operation) -> None:
raise ValueError(f'Qubit pair is not valid on device: {operation.qubits!r}')

def __str__(self) -> str:
# If all qubits are grid qubits, render an appropriate text diagram.
if all(isinstance(q, cirq.GridQubit) for q in self._metadata.qubit_set):
diagram = cirq.TextDiagramDrawer()
diagram = cirq.TextDiagramDrawer()

qubits = cast(Set[cirq.GridQubit], self._metadata.qubit_set)
qubits = cast(Set[cirq.GridQubit], self._metadata.qubit_set)

# Don't print out extras newlines if the row/col doesn't start at 0
min_col = min(q.col for q in qubits)
min_row = min(q.row for q in qubits)
# Don't print out extras newlines if the row/col doesn't start at 0
min_col = min(q.col for q in qubits)
min_row = min(q.row for q in qubits)

for q in qubits:
diagram.write(q.col - min_col, q.row - min_row, str(q))
for q in qubits:
diagram.write(q.col - min_col, q.row - min_row, str(q))

# Find pairs that are connected by two-qubit gates.
Pair = Tuple[cirq.GridQubit, cirq.GridQubit]
pairs = sorted({cast(Pair, tuple(pair)) for pair in self._metadata.qubit_pairs})
# Find pairs that are connected by two-qubit gates.
Pair = Tuple[cirq.GridQubit, cirq.GridQubit]
pairs = sorted({cast(Pair, tuple(pair)) for pair in self._metadata.qubit_pairs})

# Draw lines between connected pairs. Limit to horizontal/vertical
# lines since that is all the diagram drawer can handle.
for q1, q2 in pairs:
if q1.row == q2.row or q1.col == q2.col:
diagram.grid_line(
q1.col - min_col, q1.row - min_row, q2.col - min_col, q2.row - min_row
)
# Draw lines between connected pairs. Limit to horizontal/vertical
# lines since that is all the diagram drawer can handle.
for q1, q2 in pairs:
if q1.row == q2.row or q1.col == q2.col:
diagram.grid_line(
q1.col - min_col, q1.row - min_row, q2.col - min_col, q2.row - min_row
)

return diagram.render(
horizontal_spacing=3, vertical_spacing=2, use_unicode_characters=True
)

return super().__str__()
return diagram.render(horizontal_spacing=3, vertical_spacing=2, use_unicode_characters=True)

def _repr_pretty_(self, p: Any, cycle: bool) -> None:
"""Creates ASCII diagram for Jupyter, IPython, etc."""
Expand All @@ -260,15 +271,3 @@ def _from_json_dict_(cls, metadata, **kwargs):

def _value_equality_values_(self):
return self._metadata


def _qid_from_str(id_str: str) -> cirq.Qid:
"""Translates a qubit id string info cirq.Qid objects.
Tries to translate to GridQubit if possible (e.g. '4_3'), otherwise
falls back to using NamedQubit.
"""
try:
return v2.grid_qubit_from_proto_id(id_str)
except ValueError:
return v2.named_qubit_from_proto_id(id_str)
33 changes: 23 additions & 10 deletions cirq-google/cirq_google/devices/grid_device_test.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -80,8 +80,20 @@ def _create_device_spec_with_all_couplings():
return grid_qubits, spec


def _create_device_spec_invalid_qubit_name() -> v2.device_pb2.DeviceSpecification:
"""Creates a DeviceSpecification with a qubit name that does not conform to '<int>_<int>'."""
q_proto_id = v2.qubit_to_proto_id(cirq.NamedQubit('q0_0'))

spec = v2.device_pb2.DeviceSpecification()
spec.valid_qubits.extend([q_proto_id])

return spec


def _create_device_spec_qubit_pair_self_loops() -> v2.device_pb2.DeviceSpecification:
q_proto_id = v2.qubit_to_proto_id(cirq.NamedQubit('q'))
"""Creates an invalid DeviceSpecification with a qubit pair ('0_0', '0_0')."""

q_proto_id = v2.qubit_to_proto_id(cirq.GridQubit(0, 0))

spec = v2.device_pb2.DeviceSpecification()
spec.valid_qubits.extend([q_proto_id])
Expand All @@ -95,6 +107,8 @@ def _create_device_spec_qubit_pair_self_loops() -> v2.device_pb2.DeviceSpecifica


def _create_device_spec_invalid_qubit_in_qubit_pair() -> v2.device_pb2.DeviceSpecification:
"""Creates a DeviceSpecification where qubit '0_1' is in a pair but not in valid_qubits."""

q_proto_ids = [v2.qubit_to_proto_id(cirq.GridQubit(0, i)) for i in range(2)]

spec = v2.device_pb2.DeviceSpecification()
Expand All @@ -109,6 +123,8 @@ def _create_device_spec_invalid_qubit_in_qubit_pair() -> v2.device_pb2.DeviceSpe


def _create_device_spec_invalid_subset_permutation_target() -> v2.device_pb2.DeviceSpecification:
"""Creates a DeviceSpecification where a SUBSET_PERMUTATION target contains 2 qubits."""

q_proto_ids = [v2.qubit_to_proto_id(cirq.GridQubit(0, i)) for i in range(2)]

spec = v2.device_pb2.DeviceSpecification()
Expand All @@ -122,7 +138,7 @@ def _create_device_spec_invalid_subset_permutation_target() -> v2.device_pb2.Dev
return spec


def test_grid_device_from_proto_and_validation():
def test_grid_device_from_proto():
grid_qubits, spec = _create_device_spec_with_horizontal_couplings()

device = cirq_google.GridDevice.from_proto(spec)
Expand Down Expand Up @@ -165,6 +181,11 @@ def test_grid_device_validate_operations_negative():
# TODO(#5050) verify validate_operations gateset errors


def test_grid_device_invalid_qubit_name():
with pytest.raises(ValueError, match='not in the GridQubit form'):
cirq_google.GridDevice.from_proto(_create_device_spec_invalid_qubit_name())


def test_grid_device_invalid_qubit_in_qubit_pair():
with pytest.raises(ValueError, match='which is not in valid_qubits'):
cirq_google.GridDevice.from_proto(_create_device_spec_invalid_qubit_in_qubit_pair())
Expand Down Expand Up @@ -218,11 +239,3 @@ def test_grid_device_repr_pretty(cycle, func):
printer = mock.Mock()
device._repr_pretty_(printer, cycle)
printer.text.assert_called_once_with(func(device))


def test_grid_device_str_named_qubits():
q_proto_id = v2.qubit_to_proto_id(cirq.NamedQubit('q'))
spec = v2.device_pb2.DeviceSpecification()
spec.valid_qubits.extend([q_proto_id])
device = cirq_google.GridDevice.from_proto(spec)
assert device.__class__.__name__ in str(device)

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