code: def mlb():
      ratings = lktu.ml_test.ratings
      algo = Bias()
      algo.fit(ratings)
      return MLB(ratings, algo)
  
file_path: lkpy/tests/test_batch_predict.py
imports: import pytest
  import logging
  from collections import namedtuple
  import pandas
  import numpy
  import lenskit.util.test
  from lenskit.algorithms.bias import Bias
  import lenskit.batch
label_desc: Use image node_id 1 for calling a global function with example usage: mlb() and returns: MLB