code: def lr_fun_exp(cur_epoch):
      """Exponential schedule (cfg.OPTIM.LR_POLICY = 'exp')."""
      return cfg.OPTIM.MIN_LR ** (cur_epoch / cfg.OPTIM.MAX_EPOCH)
  
file_path: pycls/pycls/core/optimizer.py
imports: import matplotlib.pyplot
  import numpy
  import torch
  from pycls.core.config import cfg
label_desc: Use image node_id 3 for calling a global function with example usage: lr_fun_exp(cur_epoch) and returns: unknown