code: def test_fit_notallzeros(lfrfitmodel):
      """Should not be all zeros."""
      expected = False
      all_zeros = not np.any(lfrfitmodel)
      print("allzeros:" + str(all_zeros))
      assert all_zeros == expected
  
file_path: AIF360/tests/test_lfr.py
imports: import os
  import sys
  import numpy
  import pytest
  from aif360.algorithms.preprocessing import LFR
  from aif360.algorithms.preprocessing.optim_preproc_helpers.data_preproc_functions import load_preproc_data_adult
label_desc: Use image node_id 6 for calling a global function with example usage: test_fit_notallzeros(lfrfitmodel) without return types