code: def test_assert_all_nan_input_numpy_rand(self):
      a = np.random.rand(10, 10, 10).astype(
          dtype_util.as_numpy_dtype(self.dtype)
      )
      with self.assertRaisesRegex(
          AssertionError, "Arrays are not equal"
      ):
          self.assertAllNan(a)
  
imports: import collections
  from absl import flags
  from absl.testing import flagsaver
  from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import dtype_util
  from tensorflow_probability.python.internal import test_combinations
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.util.seed_stream import SeedStream
label_desc: Use image node_id 8 for calling the _TestCaseTest obj's underlying member method code with example usage: obj.test_assert_all_nan_input_numpy_rand() without return types