code: def _tuple_to_gpu(xs):
      return tuple(cuda.to_gpu(x) for x in xs)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer.functions.math import einsum
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer import utils
label_desc: Use image node_id 1 for calling a global function with example usage: _tuple_to_gpu(xs) and returns: tuple