code: def masked_mae(X_true, X_pred, mask):
      masked_diff = X_true[mask] - X_pred[mask]
      return np.mean(np.abs(masked_diff))
  
imports: import logging
  import importlib
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: masked_mae(X_true, X_pred, mask) and returns: np