code: def flatten_lists(listoflists):
      """
      Flatten a python list of list
  
      :param listoflists: (list(list))
      :return: (list)
      """
      return [el for list_ in listoflists for el in list_]
  
file_path: stable-baselines/stable_baselines/common/misc_util.py
imports: import random
  import gym
  import numpy
  import tensorflow
label_desc: Use image node_id 5 for calling a global function with example usage: flatten_lists(listoflists) and returns: unknown