Source code for qlauncher.routines.dwave.backends

 1"""DWave backends"""
 2
 3from abc import abstractmethod, ABC
 4from qlauncher.base import Backend
 5
 6
 7from qlauncher.exceptions import DependencyError
 8
 9try:
10    from dimod import Sampler
11    from dwave.system import DWaveSampler, EmbeddingComposite
12    from dwave.samplers import SimulatedAnnealingSampler, TabuSampler, SteepestDescentSampler
13except ImportError as e:
14    raise DependencyError(e, install_hint='dwave') from e
15
16

[docs]
17class BQMBackend(Backend, ABC):
18    """Base dwave backend"""
19
20    def __init__(self, name: str, parameters: list | None = None) -> None:
21        super().__init__(name, parameters)
22        self.sampler = self._get_sampler()
23
24    @abstractmethod
25    def _get_sampler(self) -> Sampler:
26        """Get a dimod sampler"""

27
28

[docs]
29class TabuBackend(BQMBackend):
30    """Tabu search simulator backend"""
31
32    def __init__(self, parameters: list | None = None) -> None:
33        super().__init__("TabuBackend", parameters)
34
35    def _get_sampler(self):
36        return TabuSampler()

37
38

[docs]
39class SimulatedAnnealingBackend(BQMBackend):
40    """Simulated annealing simulator backend"""
41
42    def __init__(self, parameters: list | None = None) -> None:
43        super().__init__("SimulatedAnnealingBackend", parameters)
44
45    def _get_sampler(self) -> Sampler:
46        return SimulatedAnnealingSampler()

47
48

[docs]
49class SteepestDescentBackend(BQMBackend):
50    """Steepest descent simulator backend"""
51
52    def __init__(self, parameters: list | None = None) -> None:
53        super().__init__("SteepestDescentBackend", parameters)
54
55    def _get_sampler(self) -> Sampler:
56        return SteepestDescentSampler()

57
58

[docs]
59class DwaveBackend(BQMBackend):
60    """Real Dwave device backend"""
61
62    def __init__(self, parameters: list | None = None) -> None:
63        super().__init__("DwaveDevice", parameters)
64
65    def _get_sampler(self) -> Sampler:
66        return EmbeddingComposite(DWaveSampler())