code: def forward_expected(self, inputs):
      rx, ix = inputs
      expected = getattr(numpy.fft, self.method)(rx + ix * 1j)
      return (
          expected.real.astype(self.dtype),
          expected.imag.astype(self.dtype),
      )
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_fft.py
imports: import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 4 for calling the TestFFT obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: expected,  expected