docstr: Insert gradient offload execution period of the current region to the end of the d2h stream
docstr_tok: ["Insert","gradient","offload","execution","period","of","the","current","region","to","the","end","of","the","d2h","stream"]
code: def _insert_d2h_exec(self, region: Region):
      """
      Insert gradient offload execution period of the current region to the end of the d2h stream
      """
  
      offl_start_time = max(
          self.last_d2h.end_time, self.last_comp.end_time
      )
      offl_end_time = (
          offl_start_time
          + self._get_communication_overhead("d2h", region.param_size)
      )
      offl_ep = ExecutionPeriod(
          start_time=offl_start_time, end_time=offl_end_time
      )
      self.bwd_reg_to_offl_waiting[region.r_id] = offl_ep
      self.last_d2h = offl_ep
  
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 5 for calling the AsynTrainingSimulator obj's underlying member method code with example usage: obj._insert_d2h_exec(region) without return types