code: def lr_fun_lin(cur_epoch):
      """Linear schedule (cfg.OPTIM.LR_POLICY = 'lin')."""
      lr = 1.0 - cur_epoch / cfg.OPTIM.MAX_EPOCH
      return (1.0 - cfg.OPTIM.MIN_LR) * lr + cfg.OPTIM.MIN_LR
  
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 5 for calling a global function with example usage: lr_fun_lin(cur_epoch) and returns: unknown