def test_no_silent_rewind(self):
decomposer = ComponentDecomposer(silent_rewind=False)
state1 = decomposer.next(self.state)
state2 = decomposer.next(state1)
with self.assertRaises(EndOfStream):
state3 = decomposer.next(state2)
def test_default(self):
decomposer = ComponentDecomposer()
state1 = decomposer.next(self.state)
self.assertIn(dict(state1.subproblem.linear), ({
'a': 2
}, {
'b': -1,
'c': 0,
'd': 1
}))
state2 = decomposer.next(state1)
self.assertIn(dict(state2.subproblem.linear), ({
'a': 2
}, {
'b': -1,
'c': 0,
'd': 1
}))
self.assertNotEqual(dict(state1.subproblem.linear),
dict(state2.subproblem.linear))
state3 = decomposer.next(
state2) # silent_rewind=True, so rewind w/o raising an assertion
self.assertIn(dict(state3.subproblem.linear), ({
'a': 2
}, {
'b': -1,
'c': 0,
'd': 1
}))
def test_empty(self):
bqm = dimod.BinaryQuadraticModel(dimod.SPIN)
state = State.from_sample(random_sample(bqm), bqm)
decomposer = ComponentDecomposer()
state1 = decomposer.next(state)
self.assertEqual(bqm, state1.subproblem)
def test_sort(self):
decomposer = ComponentDecomposer(key=len)
state1 = decomposer.next(self.state)
self.assertDictEqual(dict(state1.subproblem.linear), {
'b': -1,
'c': 0,
'd': 1
})
def test_one_component(self):
bqm = dimod.BinaryQuadraticModel({
'a': 1,
'b': -1
}, {'ab': 1}, 0, dimod.SPIN)
state = State.from_sample(random_sample(bqm), bqm)
decomposer = ComponentDecomposer()
state1 = decomposer.next(state)
self.assertEqual(bqm, state1.subproblem)
def test_key_func(self):
def sum_linear_biases(component):
total = 0
for v in component:
total += self.bqm.get_linear(v)
return total
decomposer = ComponentDecomposer(key=sum_linear_biases)
state1 = decomposer.next(self.state)
self.assertDictEqual(dict(state1.subproblem.linear), {'a': 2})
def test_no_rolling(self):
decomposer = ComponentDecomposer(rolling=False, key=len)
state1 = decomposer.next(self.state)
self.assertDictEqual(dict(state1.subproblem.linear), {
'b': -1,
'c': 0,
'd': 1
})
state2 = decomposer.next(state1)
self.assertDictEqual(dict(state2.subproblem.linear), {
'b': -1,
'c': 0,
'd': 1
})
def test_sort_reverse(self):
decomposer = ComponentDecomposer(key=len, reverse=False)
state1 = decomposer.next(self.state)
self.assertDictEqual(dict(state1.subproblem.linear), {'a': 2})