code: def CheckApproximation(self, a, q, r):
      # Tests that a ~= q*r.
      precision = self.AdjustedNorm(a - np.matmul(q, r))
      self.assertTrue(np.all(precision < 11.0))
  
imports: import itertools
  import unittest
  from absl.testing import parameterized
  import numpy
  from tensorflow.compiler.tests import xla_test
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import linalg_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the QrOpTest obj's underlying member method code with example usage: obj.CheckApproximation(a, q, r) without return types