code: def flatten_list(list_of_list):
      """Input a list of list, return a list that all items are in a list.
  
      Parameters
      ----------
      list_of_list : a list of list
  
      Examples
      --------
      >>> tl.utils.flatten_list([[1, 2, 3],[4, 5],[6]])
      [1, 2, 3, 4, 5, 6]
  
      """
      return sum(list_of_list, [])
  
imports: import os
  import random
  import subprocess
  import sys
  import time
  from collections import Counter
  from sys import exit
  from sys import platform
  import numpy
  import tensorflow
  from sklearn.metrics import accuracy_score, confusion_matrix, f1_score
  import tensorlayer
label_desc: Use image node_id 6 for calling a global function with example usage: flatten_list(list_of_list) and returns: sum