code: def lr_func_step(cur_iter):
      """For cfg.SOLVER.LR_POLICY = 'step'"""
      return cfg.SOLVER.BASE_LR * cfg.SOLVER.GAMMA ** (
          cur_iter // cfg.SOLVER.STEP_SIZE
      )
  
file_path: dense-pose/detectron/utils/lr_policy.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  import numpy
  from detectron.core.config import cfg
label_desc: Use image node_id 4 for calling a global function with example usage: lr_func_step(cur_iter) and returns: unknown