def column(self, index):
if isinstance(index, Share):
is_selected = mpc.unit_vector(index, self.number_of_attributes)
return self.map(lambda sample: ObliviousArray.create(sample.inputs)
.select(is_selected).sum())
else:
return self.map(lambda sample: sample.inputs[index])
def create(cls, *samples, continuous=None, labels=None):
samples = ObliviousArray.create(samples)
number_of_attributes = len(samples[0]) if len(samples) > 0 else 0
if not continuous:
continuous = [False for i in range(number_of_attributes)]
if not labels:
labels = [secint(i) for i in range(number_of_attributes)]
return ObliviousDataset(samples, number_of_attributes, continuous,
labels)
def test_getitem_with_secret_index(self):
array = ObliviousArray.create(s(10), s(20), s(30))
item = array.getitem(s(1))
self.assertEqual(reveal(item), 20)
def test_initialize_with_list(self):
self.assertEqual(reveal(ObliviousArray.create(s(1), s(2))),
reveal(ObliviousArray([s(1), s(2)])))
self.assertEqual(reveal(ObliviousArray.create(s(1))),
reveal(ObliviousArray([s(1)])))
def test_sum_on_selected_elements(self):
array = ObliviousArray.create(s(10), s(20), s(30))
array = array.select(s(1), s(0), s(1))
sum = array.sum()
self.assertEqual(reveal(sum), 40)
def test_len_of_subset(self):
dataset = ObliviousArray.create(s(0), s(1), s(2))
dataset = dataset.select(s(1), s(0), s(1))
self.assertEqual(reveal(dataset.len()), 2)
def is_continuous(self, attribute_index):
if isinstance(attribute_index, Share):
continuous = ObliviousArray(list(map(secint, self.continuous)))
return continuous.getitem(attribute_index)
else:
return self.continuous[attribute_index]
def sort_array(column, outcomes):
values, outcome_values = sort_lists(column.values, outcomes.values)
return (ObliviousArray(values), ObliviousArray(outcome_values))
def test_map_on_selected_elements(self):
array = ObliviousArray.create(s(10), s(20), s(30))
array = array.select(s(1), s(0), s(1))
array = array.map(lambda x: 2 * x)
self.assertEqual(reveal(array), [20, 60])
def test_map(self):
array = ObliviousArray.create(s(10), s(20), s(30))
array = array.map(lambda x: 2 * x)
self.assertEqual(reveal(array), [20, 40, 60])
def test_select_with_selection_as_argument(self):
array = ObliviousArray.create(s(10), s(20), s(30))
included = ObliviousArray.create(s(1), s(0), s(1))
included = included.select(s(0), s(0), s(1))
array = array.select(included)
self.assertEqual(reveal(array), [30])
def test_select_and_select_again(self):
array = ObliviousArray.create(s(10), s(20), s(30))
array = array.select(s(1), s(0), s(1))
array = array.select(s(0), s(1), s(1))
self.assertEqual(reveal(array), [30])
def test_reveal_selected_elements(self):
array = ObliviousArray.create(s(10), s(20), s(30))
array = array.select(s(0), s(1), s(0))
self.assertEqual(reveal(array), [20])
def test_reveal_all_elements(self):
array = ObliviousArray.create(s(10), s(20), s(30))
self.assertEqual(reveal(array), [10, 20, 30])
def test_getitem_on_selected_elements(self):
array = ObliviousArray.create(s(10), s(20), s(30))
selection = array.select(s(1), s(0), s(1))
self.assertEqual(reveal(selection.getitem(s(0))), 10)
self.assertEqual(reveal(selection.getitem(s(1))), 0)
self.assertEqual(reveal(selection.getitem(s(2))), 30)
def arr(*values):
return ObliviousArray([*values])
def test_reduce(self):
array = ObliviousArray.create(s(10), s(20), s(30))
product = array.reduce(s(1), operator.mul)
self.assertEqual(reveal(product), 6000)
def test_reduce_on_selected_elements(self):
array = ObliviousArray.create(s(10), s(20), s(30))
array = array.select(s(1), s(0), s(1))
product = array.reduce(s(1), operator.mul)
self.assertEqual(reveal(product), 300)
def test_reduce_with_initial_value(self):
array = ObliviousArray.create()
product = array.reduce(s(1), operator.mul, initial=s(42))
self.assertEqual(reveal(product), 42)
def label(self, attribute_index):
labels = ObliviousArray(self.labels)
return labels.getitem(attribute_index)
def test_sum(self):
array = ObliviousArray.create(s(10), s(20), s(30))
sum = array.sum()
self.assertEqual(reveal(sum), 60)
def select_best_attribute(samples):
(gains, thresholds) = calculate_gains(samples)
(_, index) = maximum(ObliviousArray.create(gains))
threshold = ObliviousArray(thresholds).getitem(index)
return (index, threshold)
def test_len(self):
self.assertEqual(reveal(ObliviousArray.create().len()), 0)
self.assertEqual(reveal(ObliviousArray([s(0), s(1), s(2)]).len()), 3)
