code: def MAE(v, v_):
      """Mean absolute error."""
      return np.mean(np.abs(v_ - v))
  
file_path: PGL/legacy/examples/stgcn/utils/math_utils.py
imports: import os
  import sys
  import time
  import argparse
  import numpy
label_desc: Use image node_id 5 for calling a global function with example usage: MAE(v, v_) and returns: np