code: def setUp(self):
      self.x = numpy.array(self.x_data, dtype="i")
      self.gy = numpy.random.uniform(-1, 1, self.x.shape + (2,)).astype(
          "f"
      )
      self.ggW = numpy.random.uniform(-1, 1, self.w_shape).astype("f")
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer.functions.connection import embed_id
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import backend
label_desc: Use image node_id 1 for calling the TestEmbedIdGrad obj's underlying member method code with example usage: obj.setUp() without return types