code: def AUC_SE_calc(AUC, P, N):
      """
      Calculate AUC standard error.
  
      :param AUC: AUC value
      :type AUC: float
      :param P: number of actual positives
      :type P: int
      :param N: number of actual negatives
      :type N: int
      :return: standard error as float
      """
      try:
          q0 = AUC * (1 - AUC)
          q1 = (AUC / (2 - AUC)) - AUC**2
          q2 = ((2 * (AUC**2)) / (1 + AUC)) - AUC**2
          result = math.sqrt(
              (q0 + (N - 1) * q1 + (P - 1) * q2) / (P * N)
          )
          return result
      except Exception:
          return "None"
  
file_path: pycm/pycm/pycm_ci.py
imports: from __future__ import division
  import math
label_desc: Use image node_id 3 for calling a global function with example usage: AUC_SE_calc(AUC, P, N) and returns: result, str