def close(self):
"""
Close a binary relation in the ``Concept``'s extension set.
:return: a new extension for the ``Concept`` in which the
relation is closed under a given property
"""
from nltk.sem import is_rel
assert is_rel(self._extension)
if "symmetric" in self.closures:
pairs = []
for (x, y) in self._extension:
pairs.append((y, x))
sym = set(pairs)
self._extension = self._extension.union(sym)
if "transitive" in self.closures:
all = self._make_graph(self._extension)
closed = self._transclose(all)
trans = self._make_pairs(closed)
self._extension = self._extension.union(trans)
self.extension = sorted(list(self._extension))
def close(self):
"""
Close a binary relation in the C{Concept}'s extension set.
:return: a new extension for the C{Concept} in which the
relation is closed under a given property
"""
from nltk.sem import is_rel
assert is_rel(self._extension)
if 'symmetric' in self.closures:
pairs = []
for (x, y) in self._extension:
pairs.append((y, x))
sym = set(pairs)
self._extension = self._extension.union(sym)
if 'transitive' in self.closures:
all = self._make_graph(self._extension)
closed = self._transclose(all)
trans = self._make_pairs(closed)
#print sorted(trans)
self._extension = self._extension.union(trans)
self.extension = list(self._extension)
