Topologies

Utilities for Zephyr, Pegasus, and Chimera topologies, including utilities for generating graphs, coordinate conversions, and more.

Graph Generators

Generators for the graphs (topologies) of D-Wave System QPUs.

chimera_graph(m[, n, t, create_using, ...])	Creates a Chimera lattice of size (m, n, t).
pegasus_graph(m[, create_using, node_list, ...])	Creates a Pegasus graph with size parameter m.
zephyr_graph(m[, t, create_using, ...])	Creates a Zephyr graph with grid parameter m and tile parameter t.

Example

This example uses the the chimera_graph() function to create a Chimera lattice of size (1, 1, 4), which is a single unit cell in Chimera topology, and the find_chimera() function to determine the Chimera indices.

>>> import networkx as nx
>>> import dwave.graphs
>>> G = dwave.graphs.chimera_graph(1, 1, 4)
>>> chimera_indices = dwave.graphs.find_chimera_indices(G)
>>> print(chimera_indices)
{0: (0, 0, 0, 0),
 1: (0, 0, 0, 1),
 2: (0, 0, 0, 2),
 3: (0, 0, 0, 3),
 4: (0, 0, 1, 0),
 5: (0, 0, 1, 1),
 6: (0, 0, 1, 2),
 7: (0, 0, 1, 3)}

Fig. 237 Indices of a Chimera unit cell found by creating a lattice of size (1, 1, 4).

Toruses

chimera_torus(m[, n, t, node_list, edge_list])	Creates a defect-free Chimera lattice of size \((m, n, t)\) subject to periodic boundary conditions.
pegasus_torus(m[, node_list, edge_list, ...])	Creates a Pegasus graph modified to allow for periodic boundary conditions and translational invariance.
zephyr_torus(m[, t, node_list, edge_list])	Creates a Zephyr graph modified to allow for periodic boundary conditions and translational invariance.

Other Graphs

markov_network(potentials)

Creates a Markov network from potentials.