class_docstr: Test for tri-diagonal matrix related ops.
code: def testUpperTriangular(self):
      self._test(
          diags=[[2, 4, -1, 0], [1, 3, 1, 2], [0, 0, 0, 0]],
          rhs=[1, 6, 4, 4],
          expected=[13, -6, 6, 2],
      )
  
imports: import numpy
  from tensorflow.compiler.tests import xla_test
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradients
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops.linalg import linalg_impl
  from tensorflow.python.platform import test
label_desc: Use image node_id 14 for calling the TridiagonalSolveOpsTest obj's underlying member method code with example usage: obj.testUpperTriangular() without return types