class_docstr: Clipped Rectifier Unit function.
  
  Clipped ReLU is written as
  :math:`ClippedReLU(x, z) = \min(\max(0, x), z)`,
  where :math:`z(>0)` is a parameter to cap return value of ReLU.
code: def backward(self, indexes, grad_outputs):
      (x,) = self.get_retained_inputs()
      if chainer.should_use_cudnn("==always") and self._use_cudnn:
          y = self.get_retained_outputs()[0]
          return ClippedReLUGrad3(x.data, y.data, self.cap).apply(
              grad_outputs
          )
      else:
          return ClippedReLUGrad2(x.data, self.cap).apply(grad_outputs)
  
imports: import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import function_node
  from chainer import utils
  from chainer.utils import type_check
  import chainerx
label_desc: Use image node_id 6 for calling the ClippedReLU obj's underlying member method code with example usage: obj.backward(indexes, grad_outputs) and returns: ClippedReLUGrad3, ClippedReLUGrad2