code: def setUp(self):
      self.log_pi = numpy.random.uniform(-1, 1, self.shape).astype(
          numpy.float32
      )
      self.tau = numpy.float32(numpy.random.uniform(0.1, 10.0))
  
file_path: chainer/tests/chainer_tests/functions_tests/noise_tests/test_gumbel_softmax.py
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestGumbelSoftmax obj's underlying member method code with example usage: obj.setUp() without return types