code: def forward_expected(self, inputs):
      (q,) = inputs
      import scipy
  
      y_expect = scipy.special.zeta(self._x, q)
      return (numpy.array(y_expect, dtype=self.dtype),)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_zeta.py
imports: import unittest
  import numpy
  import chainer
  import chainer.functions
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestZeta obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: numpy