code: def _get_closed_form_lr(self):
      if self.last_epoch <= self.T_max1:
          return (
              self.eta_min
              + (self.base_lr - self.eta_min)
              * (1 + math.cos(math.pi * self.last_epoch / self.T_max1))
              / 2
          )
      else:
          return (
              self.eta_min
              + (self.base_lr - self.eta_min)
              * (1 + math.cos(math.pi * self.last_epoch / self.T_max2))
              / 2
          )
  
file_path: PaddleOCR/ppocr/optimizer/lr_scheduler.py
imports: import math
  from paddle.optimizer.lr import LRScheduler
label_desc: Use image node_id 3 for calling the TwoStepCosineDecay obj's underlying member method code with example usage: obj._get_closed_form_lr() and returns: unknown, unknown