code: def test_divide_by():
      x = [np.ones((3, 4))]
      res = functional_utils.divide_by(x, num_workers=10)
      assert res[0].shape == x[0].shape
      assert res[0][0, 0] == 0.1
  
imports: import pytest
  import numpy
  from elephas.utils import functional_utils
label_desc: Use image node_id 4 for calling a global function with example usage: test_divide_by() without return types