code: def test_float64(self):
      self._test_grid(np.float64, self._grid64, self._error64)
  
imports: import collections
  import numpy
  from scipy import special
  from scipy import stats
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import special_math
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math.gradient import value_and_gradient
label_desc: Use image node_id 5 for calling the NdtrTest obj's underlying member method code with example usage: obj.test_float64() without return types