code: def step(self) -> None:
      self.epoch_counter.assign(self.epoch_counter + 1).realize()
      self.optimizer.lr.assign(self.get_lr()).realize()
  
imports: import math
  from typing import List
  from tinygrad.nn.optim import Optimizer
  from tinygrad.tensor import Tensor
label_desc: Use image node_id 3 for calling the LR_Scheduler obj's underlying member method code with example usage: obj.step() without return types