def transitivity(triples):
clauses = []
for triple, (rels_a, rels_b) in triples.items():
a = (triple[0], triple[1])
b = (triple[1], triple[2])
o = (triple[0], triple[2])
for rel_a in rels_a:
for rel_b in rels_b:
if rel_a == "*":
clauses.append(impl(simultaneous(*a) & relation[rel_b](*b),
relation[rel_b](*o)))
elif rel_b == "*" or rel_b == rel_a:
clauses.append(impl(relation[rel_a](*a) & relation[rel_b](*b),
relation[rel_a](*o)))
return clauses
def exhaustive_occurrence(*events):
"Relationships between events imply that the events themselves occur"
return pairwise(lambda a, b: impl(or_(simultaneous(a, b),
sequential(a, b),
sequential(b, a)),
a & b),
events)
def occurrence(relationships):
clauses = []
for pair, rels in relationships.items():
for r in rels:
clauses.append(
impl(relation[r](*pair),
var(pair[0]) & var(pair[1])))
return clauses
def exhaustive_timeline(*events):
"""
A timeline is linear, and allows only a single relationship between
each pair of events; a<b, b<a, or a*b
"""
return pairwise(lambda a, b: impl(a & b, onehot(simultaneous(a, b),
sequential(a, b),
sequential(b, a))), events)
def timeline(relationships):
"""A timeline is linear, and allows only a single relationship
between each pair of events; a<b, b<a, or a*b"""
clauses = []
for pair, rels in relationships.items():
clauses.append(impl(var(pair[0]) & var(pair[1]),
onehot(*[relation[rel](*pair) for rel in rels])))
return clauses
def test_transitivity():
def trans(s):
return transitivity(triples(relationships(s)))
statements = [sequential('a', 'b'),
sequential('b', 'c'),
sequential('d', 'e')]
assert len(trans(statements)) == 1
statements += sequential('a', 'c')
assert trans(statements)[0].equiv(
impl(and_(var("a<b"), var("b<c")), var("a<c")))
def inner(a, b, c):
return and_(impl(fn(a, b) & fn(b, c), fn(a, c)),
impl(simultaneous(a, b) & fn(b, c), fn(a, c)),
impl(fn(a, b) & simultaneous(b, c), fn(a, c)))
