code: def picp(true: np.array, low: np.array, up: np.array):
      """Prediction interval coverage probability metric. See, e.g., https://www.mdpi.com/2673-4826/2/1/2"""
      return np.mean((true >= low) & (true <= up))
  
label_desc: Use image node_id 2 for calling a global function with example usage: picp(true, low, up) and returns: np