code: def testGradientOfLogProbEvaluates(self):
      self.evaluate(
          gradient.value_and_gradient(
              negative_binomial.NegativeBinomial(0.1, 0.0).log_prob,
              [0.1],
          )
      )
  
imports: import numpy
  from scipy import stats
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import negative_binomial
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math import gradient
label_desc: Use image node_id 23 for calling the NegativeBinomialTest obj's underlying member method code with example usage: obj.testGradientOfLogProbEvaluates() without return types