code: def test_einsum_forward_gpu(self):
      inputs = _tuple_to_gpu(self.inputs)
      if self.dtype == numpy.float16:
          self.check_forward(inputs, atol=5e-3, rtol=1e-3)
      else:
          self.check_forward(inputs)
  
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 6 for calling the TestEinSum obj's underlying member method code with example usage: obj.test_einsum_forward_gpu() without return types