code: def setUp(self):
      self.skip_double_backward_test = True
  
file_path: chainer/tests/chainer_tests/functions_tests/array_tests/test_separate.py
imports: import numpy
  from chainer import functions
  from chainer import testing
  from chainer.utils import force_array
label_desc: Use image node_id 1 for calling the TestSeparate obj's underlying member method code with example usage: obj.setUp() without return types