code: def main():
      net = train(context)
  
imports: from __future__ import division
  import argparse, time, logging, os, math
  from tqdm import tqdm
  import numpy
  import mxnet
  from mxnet import gluon, nd
  from mxnet import autograd
  from mxnet.gluon import nn
  from mxnet.gluon.data.vision import transforms
  import gluoncv
  from gluoncv.data import mscoco
  from gluoncv.model_zoo import get_model
  from gluoncv.utils import makedirs, LRScheduler, LRSequential
  from gluoncv.data.transforms.presets.alpha_pose import AlphaPoseDefaultTrainTransform
  from gluoncv.utils.metrics import HeatmapAccuracy
  from validate_tools import get_val_data_loader, validate
label_desc: Use image node_id 4 for calling a global function with example usage: main() without return types