code: def setUp(self):
      self.cost = numpy.random.uniform(
          -1, 1, (self.n_label, self.n_label)
      ).astype(numpy.float32)
      self.xs = [
          numpy.random.uniform(-1, 1, (b, 3)).astype(numpy.float32)
          for b in self.batches
      ]
      self.ys = [
          numpy.random.randint(0, self.n_label, (b,)).astype(
              numpy.int32
          )
          for b in self.batches
      ]
      self.g = numpy.random.uniform(-1, 1, (len(self.lengths))).astype(
          numpy.float32
      )
  
imports: import itertools
  import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestCRF1d obj's underlying member method code with example usage: obj.setUp() without return types