code: def forward(self, inputs, device):
      (q,) = inputs
      y = F.zeta(device.send(self._x.astype(q.dtype)), q)
      return (y,)
  
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 4 for calling the TestZeta obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: y