def __init__(self, epsilon, random_state=np.random.RandomState()):
"""Creates a Blip Perturbator.
Args:
epsilon: the privacy parameter
random_state: a numpy.random.RandomState used to draw random numbers
"""
SketchNoiserBase.__init__(self)
self._epsilon = epsilon
self.random_state = random_state
def __init__(self, random_state, probability=None,
flip_one_probability=None,
flip_zero_probability=None):
"""Create a fixed probility bit flip noiser.
Args:
random_state: a np.random.RandomState object.
probability: the probability that a bit will be flipped.
flip_one_probability: the probability that a one bit will be flipped. It
will be ignored if probability is given.
flip_zero_probability: the probability that a zero bit will be flipped. It
will be ignored if probability is given.
"""
SketchNoiserBase.__init__(self)
if probability is not None:
self._probability = (probability, probability)
elif flip_one_probability is not None and flip_zero_probability is not None:
self._probability = (flip_zero_probability, flip_one_probability)
else:
raise ValueError("Should provide probability or both "
"flip_one_probability and flip_zero_probability.")
self._random_state = random_state
def __init__(self, num_random_elements, random_state):
SketchNoiserBase.__init__(self)
self.num_random_elements = num_random_elements
self.random_state = random_state