code: def testSampleGradientsThroughParams(self):
      logits = self._build_variable(np.zeros(5), static_rank=True)
      loc = self._build_variable(
          np.zeros((4, 5, 2, 3)), static_rank=True
      )
      scale = self._build_variable(1.0, static_rank=True)
      dist = mixture_same_family.MixtureSameFamily(
          mixture_distribution=categorical.Categorical(logits=logits),
          components_distribution=independent.Independent(
              logistic.Logistic(loc=loc, scale=scale),
              reinterpreted_batch_ndims=2,
          ),
          reparameterize=True,
          validate_args=True,
      )
      with tf.GradientTape() as tape:
          loss = tf.reduce_sum(
              dist.sample(2, seed=test_util.test_seed())
          )
      grad = tape.gradient(loss, dist.trainable_variables)
      self.assertLen(grad, 3)
      self.assertAllNotNone(grad)
  
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 26 for calling the _MixtureSameFamilyTest obj's underlying member method code with example usage: obj.testSampleGradientsThroughParams() without return types