code: def step_lr_plateau_schedulers(self, validation_info):
      if self.lr_schedulers is not None:
          for k, v in self.lr_schedulers.items():
              if k.endswith(
                  self.allowed_lr_scheduler_key_suffixes["plateau"]
              ):
                  v.step(validation_info)
  
imports: import torch
  import tqdm
  from ..utils import common_functions
  from ..utils import loss_tracker
  from ..utils.key_checker import KeyChecker, KeyCheckerDict
label_desc: Use image node_id 19 for calling the BaseTrainer obj's underlying member method code with example usage: obj.step_lr_plateau_schedulers(validation_info) without return types