class_docstr: Interface for performing each step of a training algorithm.
code: def initialize(self):
      return []
  
file_path: tensorflow-upstream/tensorflow/python/distribute/step_fn.py
imports: from tensorflow.python.eager import backprop
  from tensorflow.python.training import optimizer
label_desc: Use image node_id 3 for calling the Step obj's underlying member method code with example usage: obj.initialize() and returns: list