def reset(self):
        """Reset class MNISTCustomIter(mx.io.NDArrayIter):"""
        # shuffle data
        if self.is_train:
            np.random.shuffle(self.idx)
            self.data = _shuffle(self.data, self.idx)
            self.label = _shuffle(self.label, self.idx)

        if self.last_batch_handle == 'roll_over' and self.cursor > self.num_data:
            self.cursor = -self.batch_size + (self.cursor % self.num_data) % self.batch_size
        else:
            self.cursor = -self.batch_size
Reset class MNISTCustomIter(mx.io.NDArrayIter):