docstr: The layer-wise offload strategy.
docstr_tok: ["The","layer-wise","offload","strategy","."]
code: def _call_solver_l2l(self):
      """
      The layer-wise offload strategy.
      """
  
      for region in self.region_list[:-1]:
          region.need_offload = True
          region.is_syn = True
  
imports: import time
  from abc import ABC, abstractmethod
  from typing import Dict, List, Type
  import torch
  from torch.fx.node import Node
  from colossalai.utils.device import get_current_device
  from .region import Region
  from .training_simulator import AsynTrainingSimulator, SynTrainingSimulator, TrainingSimulator
  from .util import NodeInfo, NvDevicePower
label_desc: Use image node_id 4 for calling the SynGreedySolver obj's underlying member method code with example usage: obj._call_solver_l2l() without return types