code: def testReparameterizationGradientsExponentialScalarComponents(self):
      def mixture_func(logits, rate):
          return mixture_same_family.MixtureSameFamily(
              mixture_distribution=categorical.Categorical(
                  logits=logits
              ),
              components_distribution=exponential.Exponential(
                  rate=rate
              ),
              reparameterize=True,
              validate_args=True,
          )
  
      for function in ["mean", "variance"]:
          self._testMixtureReparameterizationGradients(
              mixture_func,
              [
                  self._build_tensor([0.7, 0.2, 0.1]),  # logits
                  self._build_tensor([1.0, 0.5, 1.0]),
              ],  # rate
              function,
              num_samples=10000,
          )
  
imports: import numpy
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import bernoulli
  from tensorflow_probability.python.distributions import categorical
  from tensorflow_probability.python.distributions import dirichlet
  from tensorflow_probability.python.distributions import exponential
  from tensorflow_probability.python.distributions import independent
  from tensorflow_probability.python.distributions import logistic
  from tensorflow_probability.python.distributions import mixture_same_family
  from tensorflow_probability.python.distributions import mvn_diag
  from tensorflow_probability.python.distributions import normal
  from tensorflow_probability.python.internal import hypothesis_testlib
  from tensorflow_probability.python.internal import samplers
  from tensorflow_probability.python.internal import tensorshape_util
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math import gradient
label_desc: Use image node_id 21 for calling the _MixtureSameFamilyTest obj's underlying member method code with example usage: obj.testReparameterizationGradientsExponentialScalarComponents() and returns: mixture_same_family