code: def update_step(
      self, epoch: int, global_step: int, decay: float = 0.95, **kwargs
  ):
      raise NotImplementedError
  
imports: import torch
  import torch.nn
label_desc: Use image node_id 2 for calling the BaseRenderer obj's underlying member method code with example usage: obj.update_step(epoch, global_step, decay) without return types