code: def testBasic(self):
      rng = np.random.RandomState(0)
      a = np.tril(rng.randn(5, 5))
      b = rng.randn(5, 7)
      for dtype in self.float_types:
          self._VerifyTriangularSolveCombo(
              a.astype(dtype), b.astype(dtype)
          )
  
imports: import itertools
  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
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import linalg_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 5 for calling the MatrixTriangularSolveOpTest obj's underlying member method code with example usage: obj.testBasic() without return types