code: def forward(self, inputs, device):
      (x,) = inputs
      return (functions.flipud(x),)
  
file_path: chainer/tests/chainer_tests/functions_tests/array_tests/test_flipud.py
imports: import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestFlipUD obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: functions