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 __init__(self, z):
      if not isinstance(z, float):
          raise TypeError("z must be float value")
      # z must be positive.
      assert z > 0
      self.cap = z
  
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 1 to create a new ClippedReLU object from inherited base classes: function_node with example: obj = ClippedReLU(z)