code: def __init__(self, x1, x2):
      self.cond = x1 >= x2
      self.x1_shape = x1.shape
      self.x2_shape = x2.shape
  
file_path: chainer/chainer/functions/math/maximum.py
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
label_desc: Use image node_id 1 to create a new MaximumGrad object from inherited base classes: function_node with example: obj = MaximumGrad(x1, x2)