code: def double_product(l1, l2):
      for i in l1:
          for j in l2:
              for k in l1:
                  for l in l2:
                      yield i, j, k, l
  
imports: import functools
  import itertools
  from absl.testing import parameterized
  import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 17 for calling a global function with example usage: double_product(l1, l2) without return types