Remove device from circuits (#5189)

Removes v0.15 deprecation items for attaching devices to circuits.

cirq-core/cirq/circuits/circuit_dag.py

@@ -11,13 +11,12 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-import re
 from typing import Any, Callable, Dict, Generic, Iterator, TypeVar, cast, TYPE_CHECKING
 
 import functools
 import networkx
 
-from cirq import _compat, ops, devices
+from cirq import ops
 from cirq.circuits import circuit
 
 if TYPE_CHECKING:
@@ -70,17 +69,10 @@ class CircuitDag(networkx.DiGraph):
 
     disjoint_qubits = staticmethod(_disjoint_qubits)
 
-    @_compat.deprecated_parameter(
-        deadline='v0.15',
-        fix=circuit._DEVICE_DEP_MESSAGE,
-        parameter_desc='device',
-        match=lambda args, kwargs: 'device' in kwargs or len(args) == 4,
-    )
     def __init__(
         self,
         can_reorder: Callable[['cirq.Operation', 'cirq.Operation'], bool] = _disjoint_qubits,
         incoming_graph_data: Any = None,
-        device: 'cirq.Device' = devices.UNCONSTRAINED_DEVICE,
     ) -> None:
         """Initializes a CircuitDag.
 
@@ -98,15 +90,6 @@ def __init__(
         """
         super().__init__(incoming_graph_data)
         self.can_reorder = can_reorder
-        self._device = device
-
-    @property  # type: ignore
-    @_compat.deprecated(
-        deadline='v0.15',
-        fix=circuit._DEVICE_DEP_MESSAGE,
-    )
-    def device(self) -> devices.Device:
-        return self._device
 
     @staticmethod
     def make_node(op: 'cirq.Operation') -> Unique:
@@ -117,30 +100,14 @@ def from_circuit(
         circuit: circuit.Circuit,
         can_reorder: Callable[['cirq.Operation', 'cirq.Operation'], bool] = _disjoint_qubits,
     ) -> 'CircuitDag':
-        if circuit._device == devices.UNCONSTRAINED_DEVICE:
-            return CircuitDag.from_ops(circuit.all_operations(), can_reorder=can_reorder)
-        return CircuitDag.from_ops(
-            circuit.all_operations(), can_reorder=can_reorder, device=circuit._device
-        )
+        return CircuitDag.from_ops(circuit.all_operations(), can_reorder=can_reorder)
 
     @staticmethod
-    @_compat.deprecated_parameter(
-        deadline='v0.15',
-        fix=circuit._DEVICE_DEP_MESSAGE,
-        parameter_desc='device',
-        match=lambda args, kwargs: 'device' in kwargs,
-    )
     def from_ops(
         *operations: 'cirq.OP_TREE',
         can_reorder: Callable[['cirq.Operation', 'cirq.Operation'], bool] = _disjoint_qubits,
-        device: 'cirq.Device' = devices.UNCONSTRAINED_DEVICE,
     ) -> 'CircuitDag':
-        if device == devices.UNCONSTRAINED_DEVICE:
-            dag = CircuitDag(can_reorder=can_reorder)
-        else:
-            with _compat.block_overlapping_deprecation(re.escape(circuit._DEVICE_DEP_MESSAGE)):
-                dag = CircuitDag(can_reorder=can_reorder, device=device)
-
+        dag = CircuitDag(can_reorder=can_reorder)
         for op in ops.flatten_op_tree(operations):
             dag.append(cast(ops.Operation, op))
         return dag
@@ -212,11 +179,7 @@ def all_qubits(self):
         return frozenset(q for node in self.nodes for q in node.val.qubits)
 
     def to_circuit(self) -> circuit.Circuit:
-        if self._device == devices.UNCONSTRAINED_DEVICE:
-            return circuit.Circuit(self.all_operations(), strategy=circuit.InsertStrategy.EARLIEST)
-        return circuit.Circuit(
-            self.all_operations(), strategy=circuit.InsertStrategy.EARLIEST, device=self._device
-        )
+        return circuit.Circuit(self.all_operations(), strategy=circuit.InsertStrategy.EARLIEST)
 
     def findall_nodes_until_blocked(
         self, is_blocker: Callable[['cirq.Operation'], bool]

cirq-core/cirq/circuits/circuit_dag_test.py

@@ -70,21 +70,6 @@ def test_init():
     assert list(dag.edges()) == []
 
 
-def test_init_device_deprecated():
-    with cirq.testing.assert_deprecated(
-        cirq.circuits.circuit._DEVICE_DEP_MESSAGE, deadline='v0.15'
-    ):
-        _ = cirq.CircuitDag(device=cirq.UNCONSTRAINED_DEVICE)
-
-
-def test_device_deprecated():
-    dag = cirq.CircuitDag()
-    with cirq.testing.assert_deprecated(
-        cirq.circuits.circuit._DEVICE_DEP_MESSAGE, deadline='v0.15'
-    ):
-        _ = dag.device
-
-
 def test_append():
     q0 = cirq.LineQubit(0)
     dag = cirq.CircuitDag()
@@ -118,14 +103,6 @@ def test_from_ops():
     assert [(n1.val, n2.val) for n1, n2 in dag.edges()] == [(cirq.X(q0), cirq.Y(q0))]
 
 
-def test_from_ops_device_deprecated():
-    with cirq.testing.assert_deprecated(
-        cirq.circuits.circuit._DEVICE_DEP_MESSAGE, deadline='v0.15'
-    ):
-        q0 = cirq.LineQubit(0)
-        _ = cirq.CircuitDag.from_ops(cirq.X(q0), cirq.Y(q0), device=FakeDevice())
-
-
 def test_from_circuit():
     q0 = cirq.LineQubit(0)
     circuit = cirq.Circuit(cirq.X(q0), cirq.Y(q0))
@@ -136,16 +113,6 @@ def test_from_circuit():
     assert sorted(circuit.all_qubits()) == sorted(dag.all_qubits())
 
 
-def test_from_circuit_deprecated():
-    q0 = cirq.LineQubit(0)
-    circuit = cirq.Circuit(cirq.X(q0), cirq.Y(q0))
-    circuit._device = FakeDevice()
-    with cirq.testing.assert_deprecated(
-        cirq.circuits.circuit._DEVICE_DEP_MESSAGE, deadline='v0.15'
-    ):
-        _ = cirq.CircuitDag.from_circuit(circuit)
-
-
 def test_to_empty_circuit():
     circuit = cirq.Circuit()
     dag = cirq.CircuitDag.from_circuit(circuit)
@@ -167,18 +134,6 @@ def test_to_circuit():
     )
 
 
-def test_to_circuit_device_deprecated():
-    q0 = cirq.LineQubit(0)
-    circuit = cirq.Circuit(cirq.X(q0), cirq.Y(q0))
-    dag = cirq.CircuitDag.from_circuit(circuit)
-    dag._device = FakeDevice()
-
-    with cirq.testing.assert_deprecated(
-        cirq.circuits.circuit._DEVICE_DEP_MESSAGE, deadline='v0.15'
-    ):
-        _ = dag.to_circuit()
-
-
 def test_equality():
     q0, q1 = cirq.LineQubit.range(2)
     circuit1 = cirq.Circuit(