code: def label_cols(column_info):
      return column_info["label"]
  
file_path: BigDL/python/friesian/example/multi_task/run_multi_task.py
imports: import math
  from time import time
  from argparse import ArgumentParser
  from bigdl.dllib.utils.log4Error import invalidInputError
  from bigdl.orca import init_orca_context, stop_orca_context
  from bigdl.orca.learn.tf2.estimator import Estimator
  from bigdl.friesian.feature import FeatureTable
  from deepctr.feature_column import SparseFeat, DenseFeat
  from deepctr.models import MMOE, PLE
  from keras.callbacks import EarlyStopping
label_desc: Use image node_id 3 for calling a global function with example usage: label_cols(column_info) and returns: column_info