def setUp(self):
    super(CorruptTest, self).setUp()

    self.signal_lt = lt.select(self.input_lt, {'mask': util.slice_1(False)})
    rc = lt.ReshapeCoder(['z', 'channel', 'mask'], ['channel'])
    self.corrupt_coded_lt = augment.corrupt(0.1, 0.05, 0.1,
                                            rc.encode(self.signal_lt))
    self.corrupt_lt = rc.decode(self.corrupt_coded_lt)