code: def calculate_mAP(output, target):
      import torchnet.meter as meter
  
      mtr = meter.mAPMeter()
      mtr.add(output, target)
      ap = mtr.value()
      return ap
  
imports: import os
  import sys
  import time
  import functools
  import logging
  from contextlib import contextmanager
  from functools import wraps
  import numpy
  import torch.nn
  import torch
label_desc: Use image node_id 4 for calling a global function with example usage: calculate_mAP(output, target) and returns: ap