code: def setUp(self):
      self.x = numpy.random.normal(0, 10, size=(self.d, self.d)).astype(
          self.dtype
      )
      self.x = numpy.tril(self.x)
      if not self.lower:
          self.x = self.x.T
  
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 TestTriangularInvExceptions obj's underlying member method code with example usage: obj.setUp() without return types