def test_energy_equivalence(self):
binpoly = BinaryPolynomial({'abc': 1, 'bc': 1, 'ab': -1, '': 0}, 'BINARY')
spipoly = binpoly.to_spin()
variables = list(binpoly.variables)
for config in itertools.product((0, 1), repeat=len(variables)):
binary_sample = dict(zip(variables, config))
spin_sample = {v: 2*x - 1 for v, x in binary_sample.items()}
self.assertAlmostEqual(spipoly.energy(spin_sample), binpoly.energy(binary_sample))
def test_energy_equivalence_only_linear(self):
spipoly = BinaryPolynomial({'a': 5, 'b': -3}, 'SPIN')
binpoly = spipoly.to_binary()
variables = list(binpoly.variables)
for config in itertools.product((0, 1), repeat=len(variables)):
binary_sample = dict(zip(variables, config))
spin_sample = {v: 2*x - 1 for v, x in binary_sample.items()}
self.assertAlmostEqual(spipoly.energy(spin_sample), binpoly.energy(binary_sample))