code: def forward_expected(self, inputs):
      (x,) = inputs
      y_expect = numpy.expand_dims(cuda.to_cpu(x), self.axis)
      return (y_expect,)
  
file_path: chainer/tests/chainer_tests/functions_tests/array_tests/test_expand_dims.py
imports: import numpy
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 2 for calling the TestExpandDims obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: y_expect