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# coding=utf-8
from operator import itemgetter
import socket
import prolog.engine
import prolog.util
from server.hints import Hint, HintSequence
import server.problems
id = 97
group = 'family_relations'
number = 4
visible = True
facts = 'family_relations'
solution = '''\
brother(X, Y) :-
parent(P, X),
parent(P, Y),
male(X),
X \== Y.
'''
hint_type = {
'x_must_be_male': Hint('x_must_be_male'),
'common_parent_needed': Hint('common_parent_needed'),
'Y_can_be_of_any_gender': Hint('Y_can_be_of_any_gender'),
'x_y_must_be_different': Hint('x_y_must_be_different'),
}
test_cases = [
('brother(X, _)',
[{'X': 'alessandro'}, {'X': 'andrew'}, {'X': 'jeffrey'},
{'X': 'kramer'}, {'X': 'michael'}, {'X': 'william'}]),
('brother(andrew, X)',
[{'X': 'melanie'}]),
]
def test(program, solved_problems):
code = (program + '\n' +
server.problems.solutions_for_problems('prolog', solved_problems) + '\n' +
server.problems.load_facts('prolog', facts).facts)
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
if not engine_id or 'error' in map(itemgetter(0), output):
# Engine creation failed, or syntax error in code.
return 0, len(test_cases)
n_correct = 0
for query, answers in test_cases:
# Limit inferences for each solution to curb unbounded recursion.
limited = 'call_with_inference_limit(({}), 100000, _)'.format(query)
if prolog.engine.check_answers(engine_id, query=limited, answers=answers, timeout=1.0):
n_correct += 1
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return n_correct, len(test_cases)
def hint(program, solved_problems):
# tokens = prolog.util.tokenize(program)
code = (program + '\n' +
server.problems.solutions_for_problems('prolog', solved_problems) + '\n' +
server.problems.load_facts('prolog', facts).facts)
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
if not engine_id:
raise Exception('Prolog engine failed to create.')
# X must be male
if prolog.engine.ask_truth(engine_id, 'female(X), brother(X, _)'):
return [{'id': 'x_must_be_male'}]
# X and Y must have a common parent
if prolog.engine.ask_truth(engine_id,
'brother(X, Y), \+ (parent(P, X), parent(P, Y))'):
return [{'id': 'common_parent_needed'}]
# Y can be of any gender, incl. female
if prolog.engine.ask_one(engine_id,
'brother(_, Y), female(Y)') == 'false':
return [{'id': 'Y_can_be_of_any_gender'}]
# X and Y must be different
ans = prolog.engine.ask_one(engine_id,
'setof(X, (member(X, [william, alessandro, andrew]), brother(X, X)), L), length(L, N).')
# TODO this barfs if ans is 'false'
#if ans.get('N') == '3':
# return [{'id': 'x_y_must_be_different'}]
except socket.timeout as ex:
pass
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return None
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