code: def forward_cpu(self, inputs):
      (gy,) = inputs
      gx = utils.force_array(gy * self.cond, gy.dtype)
      return (gx,)
  
imports: import numpy
  from chainer.backends import cuda
  from chainer import function_node
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 3 for calling the ClipGrad obj's underlying member method code with example usage: obj.forward_cpu(inputs) and returns: gx