class_docstr: Test for tri-diagonal matrix related ops.
code: def testSequenceFormatWithDummyElements(self):
      dummy = 20  # Should be ignored by the solver.
      self._testWithDiagonalLists(
          diags=[
              [2, 1, 4, dummy],
              [1, 3, 2, 2],
              [dummy, 1, -1, 1],
          ],
          rhs=[1, 2, 3, 4],
          expected=[-9, 5, -4, 4],
          diags_format="sequence",
      )
  
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 21 for calling the TridiagonalSolveOpsTest obj's underlying member method code with example usage: obj.testSequenceFormatWithDummyElements() without return types