docstr: Simulate synchronous training process.
docstr_tok: ["Simulate","synchronous","training","process","."]
code: def execute(self):
      """
      Simulate synchronous training process.
      """
  
      for reg in self.region_list:
          self._eval_fwd_mem_per_region(reg)
  
      for reg in self.region_list.__reversed__():
          self._eval_bwd_mem_per_region(reg)
  
imports: import bisect
  from abc import ABC, abstractmethod
  from collections import OrderedDict
  from typing import Dict, List
  from torch.fx.node import Node
  from .region import Region
  from .util import *
label_desc: Use image node_id 2 for calling the SynTrainingSimulator obj's underlying member method code with example usage: obj.execute() without return types