code: def testCopyUnknownRank(self):
      logits = tf1.placeholder_with_default(
          samplers.normal([20, 3, 1, 5], seed=test_util.test_seed()),
          shape=None,
      )
      dist = bernoulli.Bernoulli(
          logits=logits, name="b1", validate_args=True
      )
      self.assertIn("b1", dist.name)
      dist = dist.copy(name="b2")
      self.assertIn("b2", dist.name)
  
imports: import numpy
  from scipy import special
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import bernoulli
  from tensorflow_probability.python.distributions import kullback_leibler
  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 5 for calling the BernoulliSlicingTest obj's underlying member method code with example usage: obj.testCopyUnknownRank() without return types