code: def setUp(self):
      while True:
          self.x = numpy.random.normal(
              0, 10, size=(self.d, self.d)
          ).astype(self.dtype)
          self.x = numpy.tril(self.x)
          if (abs(self.x.diagonal()) > 0.1).all():
              break
      if not self.lower:
          self.x = self.x.T
      self.gy = numpy.random.normal(size=(self.d, self.d)).astype(
          self.dtype
      )
      self.ggy = numpy.random.normal(size=(self.d, self.d)).astype(
          self.dtype
      )
      self.backward_options = {"atol": 1e-2, "rtol": 1e-2}
      self.double_backward_options = {"atol": 1e-2, "rtol": 1e-2}
  
imports: import unittest
  import numpy
  from chainer import cuda
  from chainer import distributions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestTriangularInv obj's underlying member method code with example usage: obj.setUp() without return types