class_docstr: Layer class modeled after Keras (http://keras.io).
code: def call(self, inputs):
      return inputs
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import tensorflow
  from tensorflow.python.util import nest
label_desc: Use image node_id 3 for calling the Layer obj's underlying member method code with example usage: obj.call(inputs) and returns: inputs