class_docstr: Test for tri-diagonal matrix related ops.
code: def test3x3(self):
      self._test(
          diags=[[2.0, -1.0, 0.0], [1.0, 3.0, 1.0], [0.0, -1.0, -2.0]],
          rhs=[1.0, 2.0, 3.0],
          expected=[-3.0, 2.0, 7.0],
      )
  
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 6 for calling the TridiagonalSolveOpsTest obj's underlying member method code with example usage: obj.test3x3() without return types