code: def mae(y_true, y_pred):
      from tensorflow.keras import backend as K
  
      return K.mean(K.abs(y_pred - y_true), axis=-1)
  
file_path: talos/talos/metrics/keras_metrics.py
label_desc: Use image node_id 1 for calling a global function with example usage: mae(y_true, y_pred) and returns: K