code: def random_variables(graph=None):
      """Return all random variables in the TensorFlow graph.
  
      Args:
        graph: TensorFlow graph.
  
      Returns:
        list of RandomVariable.
      """
      if graph is None:
          graph = tf.get_default_graph()
  
      return _RANDOM_VARIABLE_COLLECTION[graph]
  
file_path: edward/edward/util/graphs.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import six
  import sys
  import tensorflow
  from edward.models.random_variable import _RANDOM_VARIABLE_COLLECTION
label_desc: Use image node_id 2 for calling a global function with example usage: random_variables(graph) and returns: _RANDOM_VARIABLE_COLLECTION