code: def default_dense_kwargs():
      """Returns the default keyword argument values of the constructor
      of the dense layer class :tf_main:`tf.layers.Dense <layers/Dense>`.
  
      .. code-block:: python
  
          {
              "units": 256,
              "activation": "identity",
              "use_bias": True,
              "kernel_initializer": {
                  "type": "glorot_uniform_initializer",
                  "kwargs": {}
              },
              "bias_initializer": {
                  "type": "zeros_initializer",
                  "kwargs": {}
              },
              "kernel_regularizer": {
                  "type": "L1L2",
                  "kwargs": {
                      "l1": 0.,
                      "l2": 0.
                  }
              },
              "bias_regularizer": {
                  # same as in "kernel_regularizer"
                  # ...
              },
              "activity_regularizer": {
                  # same as in "kernel_regularizer"
                  # ...
              },
              "kernel_constraint": None,
              "bias_constraint": None,
              "trainable": True,
              "name": None
          }
      """
      kwargs = _common_default_conv_dense_kwargs()
      kwargs.update({"units": 256})
      return kwargs
  
imports: import copy
  import tensorflow
  import tensorflow.contrib.rnn
  from texar.tf.hyperparams import HParams
  from texar.tf.utils import utils
  from texar.tf.utils.dtypes import is_str
  from texar.tf.utils.variables import add_variable
  from texar.tf.utils.mode import is_train_mode, switch_dropout
label_desc: Use image node_id 18 for calling a global function with example usage: default_dense_kwargs() and returns: kwargs