code: def get_node(self, name):
      if not name.split(":")[0] in self.layer_map:
          raise IOError(
              "Graph doesn't have node [%s]." % name.split(":")[0]
          )
          return None
      else:
          return self.layer_map[name.split(":")[0]]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
label_desc: Use image node_id 6 for calling the Graph obj's underlying member method code with example usage: obj.get_node(name) and returns: None, self