code: def __mean_pred(true, pred):
      """A trivial metric that is just is the output of the model."""
      return np.mean(pred)
  
imports: import hashlib
  import os
  import time
  import numpy
  import sklearn
  from ..None import __version__
  from .None import measures, methods
label_desc: Use image node_id 4 for calling a global function with example usage: __mean_pred(true, pred) and returns: np