code: def remove_variable_nodes(tfssa):
      """
      This should be performed after constant propagation pass.
      """
      for v in tfssa.functions.values():
          remove_variable_node_impl(v, tfssa)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from ..basic_graph_ops import disconnect_vertex_ins, delete_node
label_desc: Use image node_id 2 for calling a global function with example usage: remove_variable_nodes(tfssa) without return types