CSP --> BQM not returning valid transformation

[JoelPasvolsky]

The following map coloring does not work

HALF CANADA 4 COLORS

import dwavebinarycsp from dwave.system.samplers import DWaveSampler from dwave.system.composites import EmbeddingComposite import operator

provinces = ['AB', 'BC', 'NT', 'SK', 'YT'] neighbors = [('AB', 'BC'), ('AB', 'NT'), ('AB', 'SK'), ('BC', 'NT'), ('BC', 'YT'), ('NT', 'SK'), ('NT', 'YT')]

one_color_configurations = {(0, 0, 0, 1), (0, 0, 1, 0), (0, 1, 0, 0), (1, 0, 0, 0)}

csp = dwavebinarycsp.ConstraintSatisfactionProblem(dwavebinarycsp.BINARY)

for province in provinces: vars = [province+'0', province+'1', province+'2', province+'3'] csp.add_constraint(one_color_configurations, vars)

for neighbor in neighbors: v, u = neighbor for i in range(4): var = [v+str(i), u+str(i)] csp.add_constraint(operator.ne, var)

bqm = dwavebinarycsp.stitch(csp)

sampler = EmbeddingComposite(DWaveSampler()) response = sampler.sample(bqm, chain_strength=3, num_reads=1000)

[arcondello]

An issue of problem construction.

for neighbor in neighbors:
    for i in range(4):
        var = [v+str(i), u+str(i)]
        csp.add_constraint([(0, 0), (0, 1), (1, 0)], var)