def _mutate_attribute(ubr: UBR, encoder: RealValueEncoder, noise_max: float,
mu: float):
if np.random.random() < mu:
noise = np.random.uniform(-noise_max, noise_max)
x1p = encoder.decode(ubr.x1)
ubr.x1 = encoder.encode(x1p, noise)
if np.random.random() < mu:
noise = np.random.uniform(-noise_max, noise_max)
x2p = encoder.decode(ubr.x2)
ubr.x2 = encoder.encode(x2p, noise)
def _widen_attribute(ubr: UBR, encoder: RealValueEncoder, noise_max: float,
mu: float):
# TODO: we should modify both condition and effect parts with the
# same noise.
if np.random.random() < mu:
noise = np.random.uniform(-noise_max, noise_max)
x1p = encoder.decode(ubr.x1)
ubr.x1 = encoder.encode(x1p, noise)
if np.random.random() < mu:
noise = np.random.uniform(-noise_max, noise_max)
x2p = encoder.decode(ubr.x2)
ubr.x2 = encoder.encode(x2p, noise)