def test_Word():
with raises(TypeError):
Word(0, Ty('n'))
with raises(TypeError):
Word('Alice', 1)
with raises(TypeError):
Word('Alice', Ty('n'), dom=1)
def tensor(self, *others):
if len(others) != 1:
return monoidal.Diagram.tensor(self, *others)
other, = others
f = rigid.Box('f', Ty('c00', 'q00', 'q00'), Ty('c10', 'q10', 'q10'))
g = rigid.Box('g', Ty('c01', 'q01', 'q01'), Ty('c11', 'q11', 'q11'))
above = Diagram.id(f.dom[:1] @ g.dom[:1] @ f.dom[1:2])\
@ Diagram.swap(g.dom[1:2], f.dom[2:]) @ Diagram.id(g.dom[2:])\
>> Diagram.id(f.dom[:1]) @ Diagram.swap(g.dom[:1], f.dom[1:])\
@ Diagram.id(g.dom[1:])
below =\
Diagram.id(f.cod[:1]) @ Diagram.swap(f.cod[1:], g.cod[:1])\
@ Diagram.id(g.cod[1:])\
>> Diagram.id(f.cod[:1] @ g.cod[:1] @ f.cod[1:2])\
@ Diagram.swap(f.cod[2:], g.cod[1:2]) @ Diagram.id(g.cod[2:])
diagram2tensor = tensor.Functor(ob={
Ty("{}{}{}".format(a, b, c)):
z.__getattribute__(y).__getattribute__(x)
for a, x in zip(['c', 'q'], ['classical', 'quantum'])
for b, y in zip([0, 1], ['dom', 'cod'])
for c, z in zip([0, 1], [self, other])
},
ar={
f: self.utensor.array,
g: other.utensor.array
})
return CQMap(self.dom @ other.dom,
self.cod @ other.cod,
utensor=diagram2tensor(above >> f @ g >> below))
def test_Functor_call():
x, y = Ty('x'), Ty('y')
f, g = rigid.Box('f', x @ x, y), rigid.Box('g', y, Ty())
ob = {x: 2, y: 3}
ar = {f: list(range(2 * 2 * 3)), g: list(range(3))}
F = Functor(ob, ar)
assert list(F(f >> g).array.flatten()) == [5.0, 14.0, 23.0, 32.0]
assert list(F(g.transpose(left=True)).array.flatten()) == [0.0, 1.0, 2.0]
with raises(TypeError):
F("Alice")
assert Functor(ob={x: Ty(2, 3)}, ar=None)(x) == Dim(2, 3)
def generate(self,
start,
max_sentences,
max_depth,
max_iter=100,
remove_duplicates=False,
not_twice=[]):
"""
Generate sentences from a context-free grammar.
Assumes the only terminal symbol is Ty().
Parameters
----------
start : type
root of the generated trees.
max_sentences : int
maximum number of sentences to generate.
max_depth : int
maximum depth of the trees.
max_iter : int
maximum number of iterations, set to 100 by default.
remove_duplicates : bool
if set to True only distinct syntax trees will be generated.
not_twice : list
list of productions that you don't want appearing twice
in a sentence, set to the empty list by default
"""
prods, cache = list(self.productions), set()
n, i = 0, 0
while (not max_sentences or n < max_sentences) and i < max_iter:
i += 1
sentence = Id(start)
depth = 0
while depth < max_depth:
recall = depth
if sentence.dom == Ty():
if remove_duplicates and sentence in cache:
break
yield sentence
if remove_duplicates:
cache.add(sentence)
n += 1
break
tag = sentence.dom[0]
random.shuffle(prods)
for prod in prods:
if prod in not_twice and prod in sentence.boxes:
continue
if Ty(tag) == prod.cod:
sentence = sentence << prod @ Id(sentence.dom[1:])
depth += 1
break
if recall == depth: # in this case, no production was found
break
def test_CFG():
s, n, v, vp = Ty('S'), Ty('N'), Ty('V'), Ty('VP')
R0, R1 = Box('R0', vp @ n, s), Box('R1', n @ v, vp)
Jane, loves, Bob = Word('Jane', n), Word('loves', v), Word('Bob', n)
cfg = CFG(R0, R1, Jane, loves, Bob)
assert Jane in cfg.productions
assert "CFG(Box('R0', Ty('VP', 'N'), Ty('S'))" in repr(cfg)
assert not list(CFG().generate(start=s, max_sentences=1, max_depth=1))
sentence, *_ = cfg.generate(
start=s, max_sentences=1, max_depth=10, not_twice=[Jane, Bob], seed=42)
assert sentence\
== (Jane @ loves @ Bob).normal_form(left=True) >> R1 @ Id(n) >> R0
def test_brute_force():
s, n = Ty('s'), Ty('n')
Alice = Word('Alice', n)
loves = Word('loves', n.r @ s @ n.l)
Bob = Word('Bob', n)
grammar = Cup(n, n.r) @ Id(s) @ Cup(n.l, n)
gen = brute_force(Alice, loves, Bob)
assert next(gen) == Alice @ loves @ Alice >> grammar
assert next(gen) == Alice @ loves @ Bob >> grammar
assert next(gen) == Bob @ loves @ Alice >> grammar
assert next(gen) == Bob @ loves @ Bob >> grammar
gen = brute_force(Alice, loves, Bob, target=n)
assert next(gen) == Word('Alice', Ty('n'))
assert next(gen) == Word('Bob', Ty('n'))
def test_Tensor_tensor():
assert Tensor.tensor(Tensor.id(Dim(2))) == Tensor.id(Dim(2))
assert Tensor.id(Dim(2)) @ Tensor.id(Dim(3)) == Tensor.id(Dim(2, 3))
v = Tensor(Dim(1), Dim(2), [1, 0])
assert v @ v == Tensor(dom=Dim(1), cod=Dim(2, 2), array=[1, 0, 0, 0])
assert v @ v.dagger() == v << v.dagger()
x, y = Ty('x'), Ty('y')
f, g = rigid.Box('f', x, x), rigid.Box('g', y, y)
ob, ar = {x: 2, y: 3}, {f: [1, 0, 0, 1], g: list(range(9))}
F = Functor(ob, ar)
assert F(f) @ F(g) == F(f @ g)
def test_eager_parse():
s, n = Ty('s'), Ty('n')
Alice = Word('Alice', n)
loves = Word('loves', n.r @ s @ n.l)
Bob = Word('Bob', n)
grammar = Cup(n, n.r) @ Id(s) @ Cup(n.l, n)
assert eager_parse(Alice, loves, Bob) == grammar << Alice @ loves @ Bob
who = Word('who', n.r @ n @ s.l @ n)
assert eager_parse(Bob, who, loves, Alice, target=n).offsets ==\
[0, 1, 5, 8, 0, 2, 1, 1]
with raises(NotImplementedError):
eager_parse(Alice, Bob, loves)
with raises(NotImplementedError):
eager_parse(Alice, loves, Bob, who, loves, Alice)
def normal_form(diagram, normalizer=None, **params):
"""
Applies normal form to a pregroup diagram of the form
`word @ ... @ word >> cups` by normalising the words and the sentences
seperately before combining them, so it can be drawn using `grammar.draw`.
"""
words, is_pregroup = Id(Ty()), True
for _, box, right in diagram.layers:
if isinstance(box, Word):
if right: # word boxes should be tensored left to right.
is_pregroup = False
break
words = words @ box
else:
break
wires = diagram[len(words):]
is_pregroup = is_pregroup and all(
isinstance(box, Cup) or isinstance(box, Swap) or isinstance(box, Cap)
for box in wires.boxes)
if not is_pregroup:
raise ValueError(messages.expected_pregroup())
norm = lambda d: monoidal.Diagram.normal_form(
d, normalizer=normalizer or Diagram.normalize, **params)
return norm(words) >> norm(wires)
def __init__(self, name, cod, dom=Ty(), data=None, _dagger=False):
if not isinstance(name, str):
raise TypeError(messages.type_err(str, name))
if not isinstance(dom, Ty):
raise TypeError(messages.type_err(Ty, dom))
if not isinstance(cod, Ty):
raise TypeError(messages.type_err(Ty, cod))
super().__init__(name, dom, cod, data, _dagger)
def generate(self,
start,
max_sentences,
max_depth,
max_iter=100,
remove_duplicates=False):
"""
Generate sentences from a context-free grammar.
Assumes the only terminal symbol is Ty().
Parameters
----------
start : type
root of the generated trees.
max_sentences : int
maximum number of sentences to generate.
max_depth : int
maximum depth of the trees.
max_iter : int
maximum number of iterations, set to 100 by default.
remove_duplicates : bool
if set to True only distinct syntax trees will be generated.
"""
prods, cache = list(self.productions), set()
n, iter = 0, 0
while n < max_sentences and (iter < max_iter):
iter += 1
sentence = Id(start)
depth = 0
while depth < max_depth:
if sentence.dom == Ty():
if remove_duplicates and sentence in cache:
break
yield sentence
if remove_duplicates:
cache.add(sentence)
n += 1
break
tag = sentence.dom[0]
random.shuffle(prods)
for prod in prods:
if Ty(tag) == prod.cod:
sentence = sentence << prod @ Id(sentence.dom[1:])
depth += 1
break
def draw(diagram, **params):
"""
Draws a pregroup diagram, i.e. of shape :code:`word @ ... @ word >> cups`.
Parameters
----------
width : float, optional
Width of the word triangles, default is :code:`2.0`.
space : float, optional
Space between word triangles, default is :code:`0.5`.
textpad : pair of floats, optional
Padding between text and wires, default is :code:`(0.1, 0.2)`.
draw_type_labels : bool, optional
Whether to draw type labels, default is :code:`True`.
aspect : string, optional
Aspect ratio, one of :code:`['equal', 'auto']`.
margins : tuple, optional
Margins, default is :code:`(0.05, 0.05)`.
fontsize : int, optional
Font size for the words, default is :code:`12`.
fontsize_types : int, optional
Font size for the types, default is :code:`12`.
figsize : tuple, optional
Figure size.
path : str, optional
Where to save the image, if :code:`None` we call :code:`plt.show()`.
pretty_types : bool, optional
Whether to draw type labels with superscript, default is :code:`False`.
triangles : bool, optional
Whether to draw words as triangular states, default is :code:`False`.
Raises
------
ValueError
Whenever the input is not a pregroup diagram.
"""
from discopy.rigid import Swap
if not isinstance(diagram, Diagram):
raise TypeError(messages.type_err(Diagram, diagram))
words, is_pregroup = Id(Ty()), True
for _, box, right in diagram.layers:
if isinstance(box, Word):
if right: # word boxes should be tensored left to right.
is_pregroup = False
break
words = words @ box
else:
break
cups = diagram[len(words):].foliation().boxes\
if len(words) < len(diagram) else []
is_pregroup = is_pregroup and words and all(
isinstance(box, Cup) or isinstance(box, Swap) for s in cups
for box in s.boxes)
if not is_pregroup:
raise ValueError(messages.expected_pregroup())
drawing.pregroup_draw(words, cups, **params)
def test_normal_form():
n = Ty('n')
w1, w2 = Word('a', n), Word('b', n)
diagram = w1 @ w2 >>\
Id(n) @ Cap(n, n.r) @ Id(n) >> Id(n @ n) @ Cup(n.r, n)
expected_result = w1 @ w2
assert expected_result == normal_form(diagram)
with raises(ValueError) as err:
normal_form(w2 >> w1 @ Id(n))
def eager_parse(*words, target=Ty('s')):
"""
Tries to parse a given list of words in an eager fashion.
"""
result = Id(Ty()).tensor(*words)
scan = result.cod
while True:
fail = True
for i in range(len(scan) - 1):
if scan[i:i + 1].r != scan[i + 1:i + 2]:
continue
cup = Cup(scan[i:i + 1], scan[i + 1:i + 2])
result = result >> Id(scan[:i]) @ cup @ Id(scan[i + 2:])
scan, fail = result.cod, False
break
if result.cod == target:
return result
if fail:
raise NotImplementedError
def test_pregroup_draw_errors():
n = Ty('n')
with raises(TypeError):
draw(0)
with raises(ValueError) as err:
draw(Cap(n, n.l))
with raises(ValueError) as err:
draw(Cup(n, n.r))
with raises(ValueError) as err:
draw(Word('Alice', n) >> Word('Alice', n) @ Id(n))
assert str(err.value) is messages.expected_pregroup()
def brute_force(*vocab, target=Ty('s')):
"""
Given a vocabulary, search for grammatical sentences.
"""
test = [()]
for words in test:
for word in vocab:
try:
yield eager_parse(*(words + (word, )), target=target)
except NotImplementedError:
pass
test.append(words + (word, ))
def __call__(self, diagram):
"""
>>> x = Ty('x')
>>> F = CircuitFunctor({x: 1}, {})
>>> assert isinstance(F(Diagram.id(x)), Circuit)
"""
if isinstance(diagram, Ty):
return PRO(len(super().__call__(diagram)))
if isinstance(diagram, Ob) and not diagram.z:
return PRO(self.ob[Ty(diagram.name)])
if isinstance(diagram, Diagram):
return Circuit._upgrade(super().__call__(diagram))
return super().__call__(diagram)
def __call__(self, diagram):
if isinstance(diagram, Ty):
return sum(map(self, diagram.objects), Dim(1))
if isinstance(diagram, Ob) and not diagram.z:
result = self.ob[Ty(diagram.name)]
return result if isinstance(result, Dim) else Dim(result)
if isinstance(diagram, Ob):
return super().__call__(diagram)
if isinstance(diagram, Cup):
return Tensor.cups(self(diagram.dom[0]), self(diagram.dom[1]))
if isinstance(diagram, Cap):
return Tensor.caps(self(diagram.cod[0]), self(diagram.cod[1]))
if isinstance(diagram, Box) and not isinstance(diagram, Swap):
if diagram.is_dagger:
return self(diagram.dagger()).dagger()
return Tensor(self(diagram.dom), self(diagram.cod),
self.ar[diagram])
if not isinstance(diagram, Diagram):
raise TypeError(messages.type_err(Diagram, diagram))
def dim(scan):
return len(self(scan))
scan, array = diagram.dom, Id(self(diagram.dom)).array
for box, off in zip(diagram.boxes, diagram.offsets):
if isinstance(box, Swap):
source = range(
dim(diagram.dom @ scan[:off]),
dim(diagram.dom @ scan[:off] @ box.dom))
target = [
i + dim(box.right)
if i < dim(diagram.dom @ scan[:off]) + dim(box.left)
else i - dim(box.left) for i in source]
array = np.moveaxis(array, list(source), list(target))
scan = scan[:off] + box.cod + scan[off + len(box.dom):]
continue
left = dim(scan[:off])
if array.shape and self(box).array.shape:
source = list(range(dim(diagram.dom) + left,
dim(diagram.dom) + left + dim(box.dom)))
target = list(range(dim(box.dom)))
array = np.tensordot(array, self(box).array, (source, target))
else:
array = array * self(box).array
source = range(len(array.shape) - dim(box.cod), len(array.shape))
target = range(dim(diagram.dom) + left,
dim(diagram.dom) + left + dim(box.cod))
array = np.moveaxis(array, list(source), list(target))
scan = scan[:off] + box.cod + scan[off + len(box.dom):]
return Tensor(self(diagram.dom), self(diagram.cod), array)
def tensor(self, *others):
if len(others) != 1:
return monoidal.Diagram.tensor(self, *others)
f = rigid.Box('f', Ty('c00', 'q00', 'q00'), Ty('c10', 'q10', 'q10'))
g = rigid.Box('g', Ty('c01', 'q01', 'q01'), Ty('c11', 'q11', 'q11'))
ob = {Ty("{}{}{}".format(a, b, c)):
z.__getattribute__(y).__getattribute__(x)
for a, x in zip(['c', 'q'], ['classical', 'quantum'])
for b, y in zip([0, 1], ['dom', 'cod'])
for c, z in zip([0, 1], [self, others[0]])}
ar = {f: self.array, g: others[0].array}
permute_above = Diagram.id(f.dom[:1] @ g.dom[:1] @ f.dom[1:2])\
@ Diagram.swap(g.dom[1:2], f.dom[2:]) @ Diagram.id(g.dom[2:])\
>> Diagram.id(f.dom[:1]) @ Diagram.swap(g.dom[:1], f.dom[1:])\
@ Diagram.id(g.dom[1:])
permute_below =\
Diagram.id(f.cod[:1]) @ Diagram.swap(f.cod[1:], g.cod[:1])\
@ Diagram.id(g.cod[1:])\
>> Diagram.id(f.cod[:1] @ g.cod[:1] @ f.cod[1:2])\
@ Diagram.swap(f.cod[2:], g.cod[1:2]) @ Diagram.id(g.cod[2:])
F = TensorFunctor(ob, ar)
array = F(permute_above >> f @ g >> permute_below).array
dom, cod = self.dom @ others[0].dom, self.cod @ others[0].cod
return CQMap(dom, cod, array)
def eval(self):
"""
Evaluates the circuit as a discopy Tensor.
Returns
-------
tensor : :class:`discopy.tensor.Tensor`
with complex amplitudes as entries.
Examples
--------
>>> state, isometry = Ket(1, 1), Id(1) @ Bra(0)
>>> assert state.eval() >> isometry.eval()\\
... == (state >> isometry).eval()
"""
return TensorFunctor({Ty(1): 2}, Quiver(lambda g: g.array))(self)
def __call__(self, diagram):
if isinstance(diagram, Ty):
return sum(map(self, diagram.objects), Dim(1))
if isinstance(diagram, Ob):
return Dim(self.ob[Ty(Ob(diagram.name, z=0))])
if isinstance(diagram, Cup):
return Tensor.cups(self(diagram.dom[0]), self(diagram.dom[1]))
if isinstance(diagram, Cap):
return Tensor.caps(self(diagram.cod[0]), self(diagram.cod[1]))
if isinstance(diagram, Box):
if diagram.is_dagger:
return self(diagram.dagger()).dagger()
return Tensor(self(diagram.dom), self(diagram.cod),
self.ar[diagram])
if not isinstance(diagram, Diagram):
raise TypeError(messages.type_err(Diagram, diagram))
def dim(scan):
return len(self(scan))
scan, array = diagram.dom, Id(self(diagram.dom)).array
for box, off in zip(diagram.boxes, diagram.offsets):
left = dim(scan[:off])
if array.shape and self(box).array.shape:
source = list(
range(
dim(diagram.dom) + left,
dim(diagram.dom) + left + dim(box.dom)))
target = list(range(dim(box.dom)))
array = np.tensordot(array, self(box).array, (source, target))
else:
array = array * self(box).array
source = range(len(array.shape) - dim(box.cod), len(array.shape))
target = range(
dim(diagram.dom) + left,
dim(diagram.dom) + left + dim(box.cod))
array = np.moveaxis(array, list(source), list(target))
scan = scan[:off] + box.cod + scan[off + len(box.dom):]
return Tensor(self(diagram.dom), self(diagram.cod), array)
def __init__(self, word, ty):
if not isinstance(word, str):
raise TypeError(messages.type_err(str, word))
if not isinstance(ty, Ty):
raise TypeError(messages.type_err(Ty, ty))
super().__init__(word, Ty(), ty)
def test_tree2diagram():
tree = {
'type':
'ba',
'cat':
'S[dcl]',
'children': [{
'word': 'that',
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': 'NP'
}, {
'type':
'fa',
'cat':
'S[dcl]\\NP',
'children': [{
'type':
'bx',
'cat':
'(S[dcl]\\NP)/NP',
'children': [{
'word': "'s",
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': '(S[dcl]\\NP)/NP'
}, {
'word': 'exactly',
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': '(S\\NP)\\(S\\NP)'
}]
}, {
'type':
'fa',
'cat':
'NP',
'children': [{
'word': 'what',
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': 'NP/(S[dcl]/NP)'
}, {
'type':
'fc',
'cat':
'S[dcl]/NP',
'children': [{
'type':
'tr',
'cat':
'S[X]/(S[X]\\NP)',
'children': [{
'word': 'i',
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': 'NP'
}]
}, {
'type':
'bx',
'cat':
'(S[dcl]\\NP)/NP',
'children': [{
'word': 'showed',
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': '(S[dcl]\\NP)/NP'
}, {
'type':
'fa',
'cat':
'(S\\NP)\\(S\\NP)',
'children': [{
'word': 'to',
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': '((S\\NP)\\(S\\NP))/NP'
}, {
'word': 'her',
'lemma': 'XX',
'pos': 'XX',
'entity': 'XX',
'chunk': 'XX',
'cat': 'NP'
}]
}]
}]
}]
}]
}]
}
diagram = tree2diagram(tree)
from discopy.biclosed import (Ty, Over, Under, Box, FA, BA, Functor,
biclosed2rigid)
from discopy.grammar.ccg import Word
assert diagram.boxes == [
Word('that', Ty('NP')),
Word("'s", Over(Under(Ty('NP'), Ty('S')), Ty('NP'))),
Word('exactly',
Under(Under(Ty('NP'), Ty('S')), Under(Ty('NP'), Ty('S')))),
Box(
'bx',
Ty(Over(Under(Ty('NP'), Ty('S')), Ty('NP')),
Under(Under(Ty('NP'), Ty('S')), Under(Ty('NP'), Ty('S')))),
Over(Under(Ty('NP'), Ty('S')), Ty('NP'))),
Word('what', Over(Ty('NP'), Over(Ty('S'), Ty('NP')))),
Word('i', Ty('NP')),
Box('tr', Ty('NP'), Over(Ty('S'), Under(Ty('NP'), Ty('S')))),
Word('showed', Over(Under(Ty('NP'), Ty('S')), Ty('NP'))),
Word(
'to',
Over(Under(Under(Ty('NP'), Ty('S')), Under(Ty('NP'), Ty('S'))),
Ty('NP'))),
Word('her', Ty('NP')),
FA(
Over(Under(Under(Ty('NP'), Ty('S')), Under(Ty('NP'), Ty('S'))),
Ty('NP'))),
Box(
'bx',
Ty(Over(Under(Ty('NP'), Ty('S')), Ty('NP')),
Under(Under(Ty('NP'), Ty('S')), Under(Ty('NP'), Ty('S')))),
Over(Under(Ty('NP'), Ty('S')), Ty('NP'))),
Box(
'FC((S << (NP >> S)), ((NP >> S) << NP))',
Ty(Over(Ty('S'), Under(Ty('NP'), Ty('S'))),
Over(Under(Ty('NP'), Ty('S')), Ty('NP'))),
Over(Ty('S'), Ty('NP'))),
FA(Over(Ty('NP'), Over(Ty('S'), Ty('NP')))),
FA(Over(Under(Ty('NP'), Ty('S')), Ty('NP'))),
BA(Under(Ty('NP'), Ty('S')))
]
assert diagram.offsets == [0, 1, 2, 1, 2, 3, 3, 4, 5, 6, 5, 4, 3, 2, 1, 0]
from discopy.rigid import Ob, Ty, Box, Cup
biclosed2rigid(diagram).boxes == [
Box('that', Ty(), Ty('NP')),
Box("'s", Ty(), Ty(Ob('NP', z=1), 'S', Ob('NP', z=-1))),
Box('exactly', Ty(), Ty(Ob('S', z=1), Ob('NP', z=2), Ob('NP', z=1),
'S')),
Box(
'bx',
Ty(Ob('NP', z=1), 'S', Ob('NP', z=-1), Ob('S', z=1), Ob('NP', z=2),
Ob('NP', z=1), 'S'), Ty(Ob('NP', z=1), 'S', Ob('NP', z=-1))),
Box('what', Ty(), Ty('NP', Ob('NP', z=-2), Ob('S', z=-1))),
Box('i', Ty(), Ty('NP')),
Box('tr', Ty('NP'), Ty('S', Ob('S', z=-1), 'NP')),
Box('showed', Ty(), Ty(Ob('NP', z=1), 'S', Ob('NP', z=-1))),
Box(
'to', Ty(),
Ty(Ob('S', z=1), Ob('NP', z=2), Ob('NP', z=1), 'S', Ob('NP',
z=-1))),
Box('her', Ty(), Ty('NP')),
Cup(Ty(Ob('NP', z=-1)), Ty('NP')),
Box(
'bx',
Ty(Ob('NP', z=1), 'S', Ob('NP', z=-1), Ob('S', z=1), Ob('NP', z=2),
Ob('NP', z=1), 'S'), Ty(Ob('NP', z=1), 'S', Ob('NP', z=-1))),
Cup(Ty('NP'), Ty(Ob('NP', z=1))),
Cup(Ty(Ob('S', z=-1)), Ty('S')),
Cup(Ty(Ob('S', z=-1)), Ty('S')),
Cup(Ty(Ob('NP', z=-2)), Ty(Ob('NP', z=-1))),
Cup(Ty(Ob('NP', z=-1)), Ty('NP')),
Cup(Ty('NP'), Ty(Ob('NP', z=1)))
]
biclosed2rigid(diagram).offsets ==\
[0, 1, 4, 1, 4, 7, 7, 10, 13, 18, 17, 10, 9, 8, 6, 5, 3, 0]
def test_Functor():
assert repr(Functor({Ty('x'): 1}, {})) ==\
"tensor.Functor(ob={Ty('x'): 1}, ar={})"
def test_Functor_swap():
x, y = Ty('x'), Ty('y')
f, g = rigid.Box('f', x, x), rigid.Box('g', y, y)
F = Functor({x: 2, y: 3}, {f: [1, 2, 3, 4], g: list(range(9))})
assert F(f @ g >> rigid.Diagram.swap(x, y)) == \
F(rigid.Diagram.swap(x, y) >> g @ f)
def __call__(self, diagram):
if isinstance(diagram, Ob) and not isinstance(diagram, Ty):
result = self.ob[Ty(diagram.name)]
return qubit ** result if isinstance(result, int) else result
return super().__call__(diagram)
def test_Functor_sum():
x, y = Ty('x'), Ty('y')
f = rigid.Box('f', x, y)
F = Functor({x: 1, y: 2}, {f: [1, 0]})
assert F(f + f) == F(f) + F(f)
def eval(self, backend=None, mixed=False, **params):
"""
Parameters
----------
backend : pytket.Backend, optional
Backend on which to run the circuit, if none then we apply
:class:`TensorFunctor` or :class:`CQMapFunctor` instead.
mixed : bool, optional
Whether to apply :class:`TensorFunctor` or :class:`CQMapFunctor`.
params : kwargs, optional
Get passed to Circuit.get_counts.
Returns
-------
tensor : :class:`discopy.tensor.Tensor`
If :code:`backend is not None` or :code:`mixed=False`.
cqmap : :class:`CQMap`
Otherwise.
Examples
--------
We can evaluate a pure circuit (i.e. with :code:`not circuit.is_mixed`)
as a unitary :class:`discopy.tensor.Tensor` or as a :class:`CQMap`:
>>> H.eval().round(2)
Tensor(dom=Dim(2), cod=Dim(2), array=[0.71, 0.71, 0.71, -0.71])
>>> H.eval(mixed=True).round(1) # doctest: +ELLIPSIS
CQMap(dom=Q(Dim(2)), cod=Q(Dim(2)), array=[0.5, ..., 0.5])
We can evaluate a mixed circuit as a :class:`CQMap`:
>>> Measure().eval()
CQMap(dom=Q(Dim(2)), cod=C(Dim(2)), array=[1, 0, 0, 0, 0, 0, 0, 1])
>>> circuit = Bits(1, 0) @ Ket(0) >> Discard(bit ** 2 @ qubit)
>>> assert circuit.eval() == CQMap(dom=CQ(), cod=CQ(), array=[1.0])
We can execute any circuit on a `pytket.Backend`:
>>> circuit = Ket(0, 0) >> sqrt(2) @ H @ X >> CX >> Measure() @ Bra(0)
>>> from unittest.mock import Mock
>>> backend = Mock()
>>> backend.get_counts.return_value = {(0, 1): 512, (1, 0): 512}
>>> assert circuit.eval(backend, n_shots=2**10).round()\\
... == Tensor(dom=Dim(1), cod=Dim(2), array=[0., 1.])
"""
if backend is None and (mixed or self.is_mixed):
ob = {Ty('bit'): C(Dim(2)), Ty('qubit'): Q(Dim(2))}
F_ob = CQMapFunctor(ob, {})
def ar(box):
if isinstance(box, Swap):
return CQMap.swap(F_ob(box.dom[:1]), F_ob(box.dom[1:]))
if isinstance(box, Discard):
return CQMap.discard(F_ob(box.dom))
if isinstance(box, Measure):
measure = CQMap.measure(
F_ob(box.dom).quantum, destructive=box.destructive)
measure = measure @ CQMap.discard(F_ob(box.dom).classical)\
if box.override_bits else measure
return measure
if isinstance(box, (MixedState, Encode)):
return ar(box.dagger()).dagger()
if not box.is_mixed and box.classical:
return CQMap(F_ob(box.dom), F_ob(box.cod), box.array)
if not box.is_mixed:
dom, cod = F_ob(box.dom).quantum, F_ob(box.cod).quantum
return CQMap.pure(Tensor(dom, cod, box.array))
raise TypeError(messages.type_err(QuantumGate, box))
return CQMapFunctor(ob, ar)(self)
if backend is None:
return TensorFunctor(lambda x: 2, lambda f: f.array)(self)
counts = self.get_counts(backend, **params)
n_bits = len(list(counts.keys()).pop())
array = np.zeros(n_bits * (2, ) or (1, ))
for bitstring, count in counts.items():
array += count * Ket(*bitstring).array
return Tensor(Dim(1), Dim(*(n_bits * (2, ))), array)
def test_from_tree():
s, n = Ty('s'), Ty('n')
Alice, Bob = Word('Alice', n), Word('Bob', n)
loves = Word('loves', n.r @ s @ n.l)
sentence = Alice @ loves @ Bob >> Cup(n, n.r) @ Id(s) @ Cup(n.l, n)
sentence == from_tree(sentence.to_tree())
