class_docstr: GraphStream is a class for delta automatical optimization
code: def __init__(self, pb_path):
      self.__path = pb_path
      self.__hint_map = {}
  
file_path: delta/gcompiler/python/delta_infer/optimizer.py
imports: from __future__ import absolute_import, division, print_function
  import os
  import sys
  from .subgraphs import *
  from .cpp import DeltaGraph, AutoOptimizer, RegisterPattern
label_desc: Use image node_id 1 to create a new GraphStream object from inherited base classes: object with example: obj = GraphStream(pb_path)