code: def assert_all_false(self, v):
      self.assertAllEqual(np.zeros_like(v, dtype=np.bool_), v)
  
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 2 for calling the NdtrGradientTest obj's underlying member method code with example usage: obj.assert_all_false(v) without return types