code: def testNoBatchTwoReplicas(self):
      # There are two replicas, so we get null swaps [0, 1], and swaps [1, 0]
      for swap_frequency in [0.0, 0.5, 1.0]:
          fn = replica_exchange_mc.even_odd_swap_proposal_fn(
              swap_frequency=swap_frequency
          )
          for step_count in range(10):
              swaps = fn(num_replica=2, step_count=step_count)
              swaps_ = self.evaluate(swaps)
  
              if (
                  # swap_frequency == 0 means never swap.
                  not swap_frequency
                  or
                  # Not at swap_period := 1 / swap_frequency.
                  step_count % int(np.ceil(1 / swap_frequency))
              ):
                  self.assertAllEqual(swaps_, [0, 1])  # No swap
              else:
                  self.assertAllEqual(swaps_, [1, 0])
  
imports: from absl import logging
  from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import categorical
  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 prefer_static
  from tensorflow_probability.python.internal import samplers
  from tensorflow_probability.python.internal import test_combinations
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.internal import unnest
  from tensorflow_probability.python.mcmc import diagnostic
  from tensorflow_probability.python.mcmc import hmc
  from tensorflow_probability.python.mcmc import random_walk_metropolis
  from tensorflow_probability.python.mcmc import replica_exchange_mc
  from tensorflow_probability.python.mcmc import sample
  from tensorflow_probability.python.mcmc import simple_step_size_adaptation
  from tensorflow_probability.python.stats import sample_stats
label_desc: Use image node_id 3 for calling the EvenOddSwapProposedFnTest obj's underlying member method code with example usage: obj.testNoBatchTwoReplicas() without return types