def to_cpu(self):
        if self.use_gpu:
            self.threshold = cuda.to_cpu(self.threshold)
            self.values = cuda.to_cpu(self.values)
            self.use_gpu = False
:param names_to_print: list of names of tensors, or just a name
dataset/ETHPy150Open pfnet/chainer/chainer/utils/walker_alias.py/WalkerAlias.to_cpu--crossover with--dataset/ETHPy150Open ppwwyyxx/tensorpack/tensorpack/callbacks/inference.py/ScalarStats.__init__