def __init__(self, ratio=0.5):
        self.ratio = ratio
        self.params = []
Ensure default ``__str__`` implementations works in the admin.
dataset/ETHPy150Open hycis/Mozi/mozi/layers/noise.py/BlackOut.__init__--crossover with--dataset/ETHPy150Open jeffknupp/sandman/tests/test_sandman.py/TestSandmanAdmin.test_admin_default_str_repr