code: def lr_step_func(epoch):
      return (
          ((epoch + 1) / (4 + 1)) ** 2
          if epoch < -1
          else 0.1 ** len([m for m in [11, 17, 22] if m - 1 <= epoch])
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: lr_step_func(epoch) and returns: unknown