class_docstr: Tests various connectors.
      
code: def setUp(self):
      tf.test.TestCase.setUp(self)
      self._batch_size = 100
  
      self._decoder_cell = layers.get_rnn_cell(
          layers.default_rnn_cell_hparams()
      )
  
file_path: texar/tests/modules/connectors/connectors_test.py
imports: import tensorflow
  from tensorflow_probability import distributions
  from tensorflow.python.util import nest
  from texar.tf.core import layers
  from texar.tf.modules import ConstantConnector
  from texar.tf.modules import MLPTransformConnector
  from texar.tf.modules import ReparameterizedStochasticConnector, StochasticConnector
  from texar.tf.modules.connectors.connectors import _assert_same_size
label_desc: Use image node_id 1 for calling the TestConnectors obj's underlying member method code with example usage: obj.setUp() without return types