class_docstr: Base class inherited by all feed-forward network classes.
  
  Args:
      hparams (dict, optional): Hyperparameters. Missing
          hyperparamerter will be set to default values. See
          :meth:`default_hparams` for the hyperparameter sturcture and
          default values.
  
  See :meth:`_build` for the inputs and outputs.
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docstr: Returns the output tensors of the layer with the specified name.
  Returns `None` if the layer name does not exist.
  
  Args:
      layer_name (str): Name of the layer.
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code: def layer_outputs_by_name(self, layer_name):
      """Returns the output tensors of the layer with the specified name.
      Returns `None` if the layer name does not exist.
  
      Args:
          layer_name (str): Name of the layer.
      """
      return self._layer_outputs_by_name.get(layer_name, None)
  
imports: import tensorflow
  from texar.tf.module_base import ModuleBase
  from texar.tf.utils import TexarError
  from texar.tf.core.layers import get_layer
  from texar.tf.utils.utils import uniquify_str
  from texar.tf.utils.mode import is_train_mode
label_desc: Use image node_id 10 for calling the FeedForwardNetworkBase obj's underlying member method code with example usage: obj.layer_outputs_by_name(layer_name) and returns: self