code: def __init__(self, graph_def):
      self._graph_def = graph_def
  
file_path: nnabla/python/src/nnabla/utils/converter/tensorflow/common.py
imports: import collections
  from .refine_graph import RefineGraph
  from .refine_parser import RefineParser
label_desc: Use image node_id 1 to create a new OptimizePb object  with example: obj = OptimizePb(graph_def)