def norm(variables, diagram, l_norm=None):
from pyxadd.matrix_vector import sum_out
if l_norm is None:
l_norm = 2
elif l_norm != 2 and l_norm != 1:
raise RuntimeError("Unsupported norm:{}, should be 1 or 2 [default: None => 2]".format(norm))
if l_norm == 2:
node_id = SquareWalker(diagram, diagram.profile).walk()
else:
node_id = AbsoluteValueWalker(diagram, diagram.profile).walk()
normed = sum_out(diagram.pool, node_id, variables)
diagram = Diagram(diagram.pool, normed)
try:
value = diagram.evaluate({})
if value < 0:
raise RuntimeError("The squared sum is negative ({})".format(value))
if l_norm == 2:
return sympy.sqrt(value)
else:
return value
except RuntimeError as e:
found = VariableFinder(diagram).walk()
if len(found) > 0:
raise RuntimeError("Variables {f} were not eliminated (given variables were {v})"
.format(f=list(found), v=variables))
else:
raise e
def norm(variables, diagram, l_norm=None):
from pyxadd.matrix_vector import sum_out
if l_norm is None:
l_norm = 2
elif l_norm != 2 and l_norm != 1:
raise RuntimeError(
"Unsupported norm:{}, should be 1 or 2 [default: None => 2]".
format(norm))
if l_norm == 2:
node_id = SquareWalker(diagram, diagram.profile).walk()
else:
node_id = AbsoluteValueWalker(diagram, diagram.profile).walk()
normed = sum_out(diagram.pool, node_id, variables)
diagram = Diagram(diagram.pool, normed)
try:
value = diagram.evaluate({})
if value < 0:
raise RuntimeError(
"The squared sum is negative ({})".format(value))
if l_norm == 2:
return sympy.sqrt(value)
else:
return value
except RuntimeError as e:
found = VariableFinder(diagram).walk()
if len(found) > 0:
raise RuntimeError(
"Variables {f} were not eliminated (given variables were {v})".
format(f=list(found), v=variables))
else:
raise e
def test_mixed_symbolic(self):
diagram_y = Diagram(self.diagram.pool, SummationWalker(self.diagram, "x").walk())
diagram_y = Diagram(diagram_y.pool, LinearReduction(diagram_y.pool).reduce(diagram_y.root_node.node_id, ["y"]))
for y in range(0, 12):
row_result = 0
for x in range(0, 12):
row_result += self.diagram.evaluate({"x": x, "y": y})
self.assertEqual(diagram_y.evaluate({"y": y}), row_result)
def test_not(self):
pool = Pool()
pool.int_var("x")
dd_true = Diagram(pool, pool.bool_test(LinearTest("x", ">=")))
dd_false = Diagram(pool, pool.invert(dd_true.root_node.node_id))
for i in range(-5, 6):
assignment = {"x": i}
self.assertEqual((dd_true.evaluate(assignment) + 1) % 2, dd_false.evaluate(assignment))
def test_summation_one_var(self):
pool = Pool()
pool.add_var("x", "int")
pool.add_var("y", "int")
b = Builder(pool)
bounds = b.test("x", ">=", 0) & b.test("x", "<=", 10)
d = b.ite(bounds, b.terminal("x"), b.terminal(0))
d_const = Diagram(pool, SummationWalker(d, "x").walk())
self.assertEqual(55, d_const.evaluate({}))
def test_square(self):
diagram = Diagram(self.diagram.pool, SquareWalker(self.diagram, self.diagram.profile).walk())
for x in range(0, 12):
obtained = diagram.evaluate({"x": x})
if x < 1:
self.assertEqual(0, obtained)
elif x <= 5:
self.assertEqual((x + 2) ** 2, obtained)
elif x <= 10:
self.assertEqual((7 - 2 * (x - 5)) ** 2, obtained)
else:
self.assertEqual(0, obtained)
def setUp(self):
pool = Pool()
pool.int_var("x")
lb = Diagram(pool, pool.bool_test(LinearTest("x - 1", ">=")))
ub = Diagram(pool, pool.bool_test(LinearTest("x - 10", "<=")))
test = Diagram(pool, pool.bool_test(LinearTest("x - 5", "<=")))
term_one = Diagram(pool, pool.terminal("x + 2"))
term_two = Diagram(pool, pool.terminal("7 - 2 * (x - 5)"))
b1 = lb & ub & test * term_one
b2 = lb & ub & ~test * term_two
self.diagram = b1 + b2
def test_square(self):
diagram = Diagram(
self.diagram.pool,
SquareWalker(self.diagram, self.diagram.profile).walk())
for x in range(0, 12):
obtained = diagram.evaluate({"x": x})
if x < 1:
self.assertEqual(0, obtained)
elif x <= 5:
self.assertEqual((x + 2)**2, obtained)
elif x <= 10:
self.assertEqual((7 - 2 * (x - 5))**2, obtained)
else:
self.assertEqual(0, obtained)
def terminal(self, exp):
if exp == "1" or exp == 1:
node_id = self.pool.one_id
elif exp == "0" or exp == 0:
node_id = self.pool.zero_id
else:
node_id = self.pool.terminal(exp)
return Diagram(self.pool, node_id)
def test_summation_two_var_test(self):
pool = Pool()
pool.add_var("x", "int")
pool.add_var("y", "int")
b = Builder(pool)
bounds = b.test("x", ">=", 0) & b.test("x", "<=", 1)
bounds &= b.test("y", ">=", 1) & b.test("y", "<=", 3)
two = b.test("x", ">=", "y")
d = b.ite(bounds, b.ite(two, b.terminal("x"), b.terminal("10")), b.terminal(0))
summed = Diagram(pool, SummationWalker(d, "x").walk())
d_const = summed.reduce(["y"])
for y in range(-20, 20):
s = 0
for x in range(-20, 20):
s += d.evaluate({"x": x, "y": y})
self.assertEqual(s, d_const.evaluate({"y": y}))
def test_multiplication(self):
pool = Pool()
pool.int_var("x")
two = pool.terminal("2")
x = pool.terminal("x")
test1 = pool.bool_test(LinearTest("x", ">="))
test2 = pool.apply(Multiplication, pool.bool_test(LinearTest("x - 5", "<=")), x)
product = pool.apply(Multiplication, test1, test2)
result = Diagram(pool, pool.apply(Multiplication, product, two))
for i in range(0, 10):
evaluated = result.evaluate({"x": i})
if 0 <= i <= 5:
self.assertEqual(2 * i, evaluated)
else:
self.assertEqual(0, evaluated)
def reduce(diagram, linear=True):
variables = [t[0] for t in column_variables + row_variables]
if linear:
reduction = LinearReduction(diagram.pool)
result = reduction.reduce(diagram.root_node.node_id, variables)
else:
reduction = SmtReduce(diagram.pool)
result = reduction.reduce(diagram.root_node.node_id, variables)
return Diagram(diagram.pool, result)
def test_multiplication(self):
pool = Pool()
pool.int_var("x")
two = pool.terminal("2")
x = pool.terminal("x")
test1 = pool.bool_test(LinearTest("x", ">="))
test2 = pool.apply(Multiplication,
pool.bool_test(LinearTest("x - 5", "<=")), x)
product = pool.apply(Multiplication, test1, test2)
result = Diagram(pool, pool.apply(Multiplication, product, two))
for i in range(0, 10):
evaluated = result.evaluate({"x": i})
if 0 <= i <= 5:
self.assertEqual(2 * i, evaluated)
else:
self.assertEqual(0, evaluated)
def construct_diagram():
pool = Pool(empty=True)
pool.int_var("x")
x = pool.terminal("x")
zero = pool.terminal("0")
test1 = pool.internal(LinearTest("x - 5", "<="), x, zero)
test2 = pool.internal(LinearTest("x + 1", ">="), test1, zero)
test3 = pool.internal(LinearTest("x + 2", "<="), x, test2)
root = pool.internal(LinearTest("x", ">="), test1, test3)
return Diagram(pool, root)
def test(self, lhs, symbol=None, rhs=None):
if symbol is None and rhs is None:
if self.pool.get_var_type(lhs) != "bool":
raise RuntimeError(
"'{}' is not a variable of type 'bool'".format(lhs))
test = BinaryTest(lhs)
else:
test = LinearTest(lhs, symbol, rhs)
return Diagram(
self.pool,
self.pool.internal(test, self.pool.one_id, self.pool.zero_id))
def setUp(self):
pool = Pool()
pool.int_var("x")
self.test1 = pool.bool_test(LinearTest("x", ">="))
self.test2 = pool.bool_test(LinearTest("x + 2", ">"))
self.test3 = pool.bool_test(LinearTest("x + 1", "<="))
self.test4 = pool.bool_test(LinearTest("x - 5", "<="))
self.x = pool.terminal("x")
p1 = pool.apply(Multiplication, self.test1, self.test4)
p2 = pool.apply(Multiplication, pool.invert(self.test1), self.test2)
p3 = pool.apply(
Multiplication,
pool.apply(
Multiplication,
pool.apply(Multiplication, pool.invert(self.test1),
pool.invert(self.test2)), self.test3), self.test4)
result = pool.apply(Summation, pool.apply(Summation, p1, p2), p3)
result = pool.apply(Multiplication, result, self.x)
self.diagram = Diagram(pool, result)
def test(self, lhs, symbol=None, rhs=None):
if symbol is None and rhs is None:
if isinstance(lhs, str) and re.match(self.inequality_pattern, lhs):
match = re.match(self.inequality_pattern, lhs)
return self.test(match.group(1), match.group(2),
match.group(3))
if self.pool.get_var_type(lhs) != "bool":
raise RuntimeError(
"'{}' is not a variable of type 'bool'".format(lhs))
test = BinaryTest(lhs)
else:
test = LinearTest(lhs, symbol, rhs)
return Diagram(
self.pool,
self.pool.internal(test, self.pool.one_id, self.pool.zero_id))
def test_not(self):
pool = Pool()
pool.int_var("x")
dd_true = Diagram(pool, pool.bool_test(LinearTest("x", ">=")))
dd_false = Diagram(pool, pool.invert(dd_true.root_node.node_id))
for i in range(-5, 6):
assignment = {"x": i}
self.assertEqual((dd_true.evaluate(assignment) + 1) % 2,
dd_false.evaluate(assignment))
def setUp(self):
pool = Pool()
pool.int_var("x")
self.test1 = pool.bool_test(LinearTest("x", ">="))
self.test2 = pool.bool_test(LinearTest("x + 2", ">"))
self.test3 = pool.bool_test(LinearTest("x + 1", "<="))
self.test4 = pool.bool_test(LinearTest("x - 5", "<="))
self.x = pool.terminal("x")
p1 = pool.apply(Multiplication, self.test1, self.test4)
p2 = pool.apply(Multiplication, pool.invert(self.test1), self.test2)
p3 = pool.apply(Multiplication, pool.apply(Multiplication, pool.apply(Multiplication,
pool.invert(self.test1),
pool.invert(self.test2)),
self.test3),
self.test4)
result = pool.apply(Summation, pool.apply(Summation, p1, p2), p3)
result = pool.apply(Multiplication, result, self.x)
self.diagram = Diagram(pool, result)
def setUp(self):
pool = Pool()
pool.int_var("x")
lb = Diagram(pool, pool.bool_test(LinearTest("x - 1", ">=")))
ub = Diagram(pool, pool.bool_test(LinearTest("x - 10", "<=")))
test = Diagram(pool, pool.bool_test(LinearTest("x - 5", "<=")))
redundant_test = Diagram(pool, pool.bool_test(LinearTest("x - 6", "<=")))
term_one = Diagram(pool, pool.terminal("x + 2"))
term_two = Diagram(pool, pool.terminal("7 - 2 * (x - 5)"))
b1 = (lb & ub & test & redundant_test) * term_one
b2 = (lb & ub & ~test & redundant_test) * term_two
self.diagram = b1 + b2
self.exporter = Exporter(os.path.join(os.path.dirname(os.path.realpath(__file__)), "visual"), "reduce")
def test_multiplication(self):
pool = Pool()
pool.int_var("x1", "x2")
x_two = Diagram(pool, pool.terminal("x2"))
two = Diagram(pool, pool.terminal("2"))
three = Diagram(pool, pool.terminal("3"))
four = Diagram(pool, pool.terminal("4"))
test11 = Diagram(pool, pool.bool_test(LinearTest("x1", ">=")))
test12 = Diagram(pool, pool.bool_test(LinearTest("x1 - 1", "<=")))
test13 = Diagram(pool, pool.bool_test(LinearTest("x1 - 3", ">")))
test21 = Diagram(pool, pool.bool_test(LinearTest("x2", ">=")))
test22 = Diagram(pool, pool.bool_test(LinearTest("x2", ">")))
test23 = Diagram(pool, pool.bool_test(LinearTest("x2 - 1", ">")))
test24 = Diagram(pool, pool.bool_test(LinearTest("x2 - 2", ">")))
x_twos = test12 * ~test23 * x_two
twos = test12 * test23 * two
threes = ~test12 * ~test22 * three
fours = ~test12 * test22 * four
unlimited = x_twos + twos + threes + fours
restricted = unlimited * test11 * ~test13 * test21 * ~test24
vector = test21 * ~test24 * Diagram(pool, pool.terminal("x2 + 1"))
result = Diagram(pool, matrix_multiply(pool, restricted.root_node.node_id, vector.root_node.node_id, ["x2"]))
for x1 in range(0, 4):
self.assertEqual(8 if x1 < 2 else 23, result.evaluate({"x1": x1}))
def test_smt_reduce(self):
self.exporter.export(self.diagram, "to_reduce")
result = SmtReduce(self.diagram.pool).reduce(
self.diagram.root_node.node_id, ["x"])
self.exporter.export(Diagram(self.diagram.pool, result), "result")
class TestDiagram(unittest.TestCase):
def setUp(self):
pool = Pool()
pool.int_var("x")
self.test1 = pool.bool_test(LinearTest("x", ">="))
self.test2 = pool.bool_test(LinearTest("x + 2", ">"))
self.test3 = pool.bool_test(LinearTest("x + 1", "<="))
self.test4 = pool.bool_test(LinearTest("x - 5", "<="))
self.x = pool.terminal("x")
p1 = pool.apply(Multiplication, self.test1, self.test4)
p2 = pool.apply(Multiplication, pool.invert(self.test1), self.test2)
p3 = pool.apply(
Multiplication,
pool.apply(
Multiplication,
pool.apply(Multiplication, pool.invert(self.test1),
pool.invert(self.test2)), self.test3), self.test4)
result = pool.apply(Summation, pool.apply(Summation, p1, p2), p3)
result = pool.apply(Multiplication, result, self.x)
self.diagram = Diagram(pool, result)
def test_evaluation(self):
self.assertEqual(4, self.diagram.evaluate({"x": 4}))
def test_multiplication(self):
pool = Pool()
pool.int_var("x")
two = pool.terminal("2")
x = pool.terminal("x")
test1 = pool.bool_test(LinearTest("x", ">="))
test2 = pool.apply(Multiplication,
pool.bool_test(LinearTest("x - 5", "<=")), x)
product = pool.apply(Multiplication, test1, test2)
result = Diagram(pool, pool.apply(Multiplication, product, two))
for i in range(0, 10):
evaluated = result.evaluate({"x": i})
if 0 <= i <= 5:
self.assertEqual(2 * i, evaluated)
else:
self.assertEqual(0, evaluated)
def test_not(self):
pool = Pool()
pool.int_var("x")
dd_true = Diagram(pool, pool.bool_test(LinearTest("x", ">=")))
dd_false = Diagram(pool, pool.invert(dd_true.root_node.node_id))
for i in range(-5, 6):
assignment = {"x": i}
self.assertEqual((dd_true.evaluate(assignment) + 1) % 2,
dd_false.evaluate(assignment))
def test_construct(self):
self.check_diagram(self.diagram, self.diagram.pool.zero_id, self.x)
def test_summation(self):
result = self.diagram + self.diagram
self.check_diagram(result, result.pool.zero_id,
result.pool.terminal("2*x"))
def check_diagram(self, diagram, zero_term, x_term):
pool = diagram.pool
layers = WalkingProfile.extract_layers(diagram,
ParentsWalker(diagram).walk())
self.assertEqual(5, len(layers))
self.assertEqual(1, len(layers[0]), layers[0])
self.assertEqual(
pool.get_node(self.test1).test,
pool.get_node(layers[0][0]).test, layers[0])
self.assertEqual(1, len(layers[1]), layers[1])
self.assertEqual(
pool.get_node(self.test2).test,
pool.get_node(layers[1][0]).test, layers[1])
self.assertEqual(1, len(layers[2]), layers[2])
self.assertEqual(
pool.get_node(self.test3).test,
pool.get_node(layers[2][0]).test, layers[2])
self.assertEqual(1, len(layers[3]), layers[3])
self.assertEqual(
pool.get_node(self.test4).test,
pool.get_node(layers[3][0]).test, layers[3])
self.assertEqual(2, len(layers[4]))
self.assertTrue(zero_term in layers[4], layers[4])
self.assertTrue(x_term in layers[4], layers[4])
def test_printing(self):
import json
encoded = Pool.to_json(self.diagram.pool)
representation = json.loads(encoded)
reconstructed = Pool.from_json(encoded)
re_encoded = Pool.to_json(reconstructed)
new_representation = json.loads(re_encoded)
self.assertEquals(representation, new_representation)
def test_inversion(self):
pool = Pool()
build = Builder(pool)
build.vars("bool", "a", "b")
build.vars("int", "x")
test1 = build.test("a")
test2 = build.test("b")
test3 = build.test("x", "<=", 5)
node3 = build.ite(test3, 1, 0)
diagram = build.ite(test1, build.ite(test2, node3, 1), node3)
self.assertTrue(is_ordered(diagram))
def inversion1(root_id):
minus_one = pool.terminal("-1")
return pool.apply(Multiplication,
pool.apply(Summation, root_id, minus_one),
minus_one)
def transform(terminal_node, d):
if terminal_node.expression == 1:
return d.pool.zero_id
elif terminal_node.expression == 0:
return d.pool.one_id
else:
raise RuntimeError("Could not invert value {}".format(
terminal_node.expression))
def inversion2(root_id):
to_invert = pool.diagram(root_id)
profile = WalkingProfile(diagram)
return leaf_transform.transform_leaves(transform, to_invert)
iterations = 1000
timer = Timer(precision=6)
timer.start("Legacy inversion")
for _ in range(iterations):
inversion1(diagram.root_id)
time_legacy = timer.stop()
inverted1 = pool.diagram(inversion1(diagram.root_id))
timer.start("New inversion")
for _ in range(iterations):
inversion2(diagram.root_id)
time_new = timer.stop()
inverted2 = pool.diagram(inversion2(diagram.root_id))
for a in [True, False]:
for b in [True, False]:
for x in range(10):
assignment = {"a": a, "b": b, "x": x}
self.assertNotEqual(diagram.evaluate(assignment),
inverted1.evaluate(assignment))
self.assertNotEqual(diagram.evaluate(assignment),
inverted2.evaluate(assignment))
self.assertTrue(
time_legacy > time_new,
"New inversion ({}) not faster than legacy implementation ({})".
format(time_new, time_legacy))
def walk(self):
return Diagram(self._diagram.pool, BottomUpWalker.walk(self))
def variables(diagram_or_node, pool=None):
if not isinstance(diagram_or_node, Diagram):
diagram_or_node = Diagram(pool, diagram_or_node)
return VariableFinder(diagram_or_node).walk()
def _get_variables(self, node_id):
return VariableFinder(Diagram(self.pool, node_id)).walk()
class TestDiagram(unittest.TestCase):
def setUp(self):
pool = Pool()
pool.int_var("x")
self.test1 = pool.bool_test(LinearTest("x", ">="))
self.test2 = pool.bool_test(LinearTest("x + 2", ">"))
self.test3 = pool.bool_test(LinearTest("x + 1", "<="))
self.test4 = pool.bool_test(LinearTest("x - 5", "<="))
self.x = pool.terminal("x")
p1 = pool.apply(Multiplication, self.test1, self.test4)
p2 = pool.apply(Multiplication, pool.invert(self.test1), self.test2)
p3 = pool.apply(Multiplication, pool.apply(Multiplication, pool.apply(Multiplication,
pool.invert(self.test1),
pool.invert(self.test2)),
self.test3),
self.test4)
result = pool.apply(Summation, pool.apply(Summation, p1, p2), p3)
result = pool.apply(Multiplication, result, self.x)
self.diagram = Diagram(pool, result)
def test_evaluation(self):
self.assertEqual(4, self.diagram.evaluate({"x": 4}))
def test_multiplication(self):
pool = Pool()
pool.int_var("x")
two = pool.terminal("2")
x = pool.terminal("x")
test1 = pool.bool_test(LinearTest("x", ">="))
test2 = pool.apply(Multiplication, pool.bool_test(LinearTest("x - 5", "<=")), x)
product = pool.apply(Multiplication, test1, test2)
result = Diagram(pool, pool.apply(Multiplication, product, two))
for i in range(0, 10):
evaluated = result.evaluate({"x": i})
if 0 <= i <= 5:
self.assertEqual(2 * i, evaluated)
else:
self.assertEqual(0, evaluated)
def test_not(self):
pool = Pool()
pool.int_var("x")
dd_true = Diagram(pool, pool.bool_test(LinearTest("x", ">=")))
dd_false = Diagram(pool, pool.invert(dd_true.root_node.node_id))
for i in range(-5, 6):
assignment = {"x": i}
self.assertEqual((dd_true.evaluate(assignment) + 1) % 2, dd_false.evaluate(assignment))
def test_construct(self):
self.check_diagram(self.diagram, self.diagram.pool.zero_id, self.x)
def test_summation(self):
result = self.diagram + self.diagram
self.check_diagram(result, result.pool.zero_id, result.pool.terminal("2*x"))
def check_diagram(self, diagram, zero_term, x_term):
pool = diagram.pool
layers = WalkingProfile.extract_layers(diagram, ParentsWalker(diagram).walk())
self.assertEqual(5, len(layers))
self.assertEqual(1, len(layers[0]), layers[0])
self.assertEqual(pool.get_node(self.test1).test, pool.get_node(layers[0][0]).test, layers[0])
self.assertEqual(1, len(layers[1]), layers[1])
self.assertEqual(pool.get_node(self.test2).test, pool.get_node(layers[1][0]).test, layers[1])
self.assertEqual(1, len(layers[2]), layers[2])
self.assertEqual(pool.get_node(self.test3).test, pool.get_node(layers[2][0]).test, layers[2])
self.assertEqual(1, len(layers[3]), layers[3])
self.assertEqual(pool.get_node(self.test4).test, pool.get_node(layers[3][0]).test, layers[3])
self.assertEqual(2, len(layers[4]))
self.assertTrue(zero_term in layers[4], layers[4])
self.assertTrue(x_term in layers[4], layers[4])
def test_printing(self):
import json
encoded = Pool.to_json(self.diagram.pool)
representation = json.loads(encoded)
reconstructed = Pool.from_json(encoded)
re_encoded = Pool.to_json(reconstructed)
new_representation = json.loads(re_encoded)
self.assertEquals(representation, new_representation)
def test_inversion(self):
pool = Pool()
build = Builder(pool)
build.vars("bool", "a", "b")
build.vars("int", "x")
test1 = build.test("a")
test2 = build.test("b")
test3 = build.test("x", "<=", 5)
node3 = build.ite(test3, 1, 0)
diagram = build.ite(test1, build.ite(test2, node3, 1), node3)
self.assertTrue(is_ordered(diagram))
def inversion1(root_id):
minus_one = pool.terminal("-1")
return pool.apply(Multiplication, pool.apply(Summation, root_id, minus_one), minus_one)
def transform(terminal_node, d):
if terminal_node.expression == 1:
return d.pool.zero_id
elif terminal_node.expression == 0:
return d.pool.one_id
else:
raise RuntimeError("Could not invert value {}".format(terminal_node.expression))
def inversion2(root_id):
to_invert = pool.diagram(root_id)
profile = WalkingProfile(diagram)
return leaf_transform.transform_leaves(transform, to_invert)
iterations = 1000
timer = Timer(precision=6)
timer.start("Legacy inversion")
for _ in range(iterations):
inversion1(diagram.root_id)
time_legacy = timer.stop()
inverted1 = pool.diagram(inversion1(diagram.root_id))
timer.start("New inversion")
for _ in range(iterations):
inversion2(diagram.root_id)
time_new = timer.stop()
inverted2 = pool.diagram(inversion2(diagram.root_id))
for a in [True, False]:
for b in [True, False]:
for x in range(10):
assignment = {"a": a, "b": b, "x": x}
self.assertNotEqual(diagram.evaluate(assignment), inverted1.evaluate(assignment))
self.assertNotEqual(diagram.evaluate(assignment), inverted2.evaluate(assignment))
self.assertTrue(time_legacy > time_new, "New inversion ({}) not faster than legacy implementation ({})"
.format(time_new, time_legacy))
def test_invert_terminal(self):
pool = Pool()
self.assertEquals(pool.zero_id, pool.invert(pool.one_id))
self.assertEquals(pool.one_id, pool.invert(pool.zero_id))
try:
pool.invert(pool.terminal(2))
self.assertTrue(False)
except RuntimeError:
self.assertTrue(True)