code: def download_data():
      results_dir = pyunit_utils.locate("results")
      prostate = h2o.import_file(
          path=pyunit_utils.locate("smalldata/logreg/prostate.csv")
      )
  
      prostate_path = h2o.download_csv(
          prostate, os.path.join(results_dir, "prostate.csv")
      )
      assert prostate_path == os.path.join(results_dir, "prostate.csv")
  
      prostate2 = h2o.import_file(path=prostate_path)
      assert_frame_equal(
          prostate.as_data_frame(), prostate2.as_data_frame()
      )
  
imports: import sys
  import os
  from tests import pyunit_utils
  import h2o
  from pandas.util.testing import assert_frame_equal
label_desc: Use image node_id 1 for calling a global function with example usage: download_data() without return types