code: def setUp(self):
      self.batch_size = 5
      array_shape = (self.batchsize,) + self.shape
      self.xs = [
          numpy.random.uniform(-1, 1, array_shape).astype(numpy.float32)
          for _ in range(self.n)
      ]
      self.gy = numpy.random.uniform(-1, 1, array_shape).astype(
          numpy.float32
      )
  
file_path: chainerrl/tests/functions_tests/test_sum_arrays.py
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  import chainerrl
label_desc: Use image node_id 1 for calling the TestSumArrays obj's underlying member method code with example usage: obj.setUp() without return types