code: def __init__(self, optimizer, lr_lambda, last_step=-1):
      super(LambdaStepLR, self).__init__(
          optimizer, lr_lambda, last_step
      )
  
imports: import sys
  from torch.optim import lr_scheduler
  from omegaconf import OmegaConf
  from omegaconf.dictconfig import DictConfig
  import logging
  from torch.optim.lr_scheduler import LambdaLR
  from torch_points3d.utils.enums import SchedulerUpdateOn
label_desc: Use image node_id 1 to create a new LambdaStepLR object from inherited base classes: LambdaLR with example: obj = LambdaStepLR(optimizer, lr_lambda, last_step)