dwave.system.composites.VirtualGraphComposite.adjacency

VirtualGraphComposite.adjacency = None

dict[variable, set] – Adjacency structure for the composed sampler.

Examples

This example uses VirtualGraphComposite to instantiate a composed sampler that uses a D-Wave solver selected by the user’s default D-Wave Cloud Client configuration file. Because qubits 0, 5, and coupled qubits {0, 4} are all coupled on the selected D-Wave solver, edges between three nodes, x, y, and z, as specified by the embedding, are available to problems using this composed sampler. However, qubit 8 is in an adjacent unit cell on the D-Wave solver and not directly connected to the other four qubits, so node a does not share an edge with any other nodes.

>>> from dwave.system.samplers import DWaveSampler
>>> from dwave.system.composites import VirtualGraphComposite
>>> embedding = {'x': {1}, 'y': {5}, 'z': {0, 4}, 'a': {8}}
>>> sampler = VirtualGraphComposite(DWaveSampler(), embedding)  
>>> sampler.adjacency  
{'a': set(), 'x': {'y', 'z'}, 'y': {'x', 'z'}, 'z': {'x', 'y'}}