code: def _calculate_correct_fan(tensor, mode, reverse=False):
      mode = mode.lower()
      valid_modes = ["fan_in", "fan_out"]
      if mode not in valid_modes:
          raise ValueError(
              "Mode {} not supported, please use one of {}".format(
                  mode, valid_modes
              )
          )
  
      fan_in, fan_out = _calculate_fan_in_and_fan_out(tensor, reverse)
  
      return fan_in if mode == "fan_in" else fan_out
  
imports: import math
  import numpy
  import paddle
  import paddle.nn
label_desc: Use image node_id 13 for calling a global function with example usage: _calculate_correct_fan(tensor, mode, reverse) and returns: unknown