docstr: Use last_epoch for the step counter
docstr_tok: ["Use","last_epoch","for","the","step","counter"]
code: def last_step(self):
      """Use last_epoch for the step counter"""
      return self.last_epoch
  
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 2 for calling the LambdaStepLR obj's underlying member method code with example usage: obj.last_step() and returns: self