code: def forward_gpu(self, inputs):
      (q,) = inputs
      self.retain_inputs((0,))
      return (
          utils.force_array(
              cuda.cupyx.scipy.special.zeta(self._x, q), dtype=q.dtype
          ),
      )
  
file_path: chainer/chainer/functions/math/zeta.py
imports: from chainer.backends import cuda
  from chainer import function_node
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 5 for calling the Zeta obj's underlying member method code with example usage: obj.forward_gpu(inputs) and returns: utils