code: def test_simple_product_tuples():
      assert _product((1, 2), (3, 4)) == [
          (1, 3),
          (1, 4),
          (2, 3),
          (2, 4),
      ]
  
imports: import pytest
  import numpy
  from sklearn_evaluation.util import _can_iterate, is_column_vector, is_row_vector, _group_by, _product, _mapping_to_tuple_pairs, map_parameters_in_fn_call
label_desc: Use image node_id 21 for calling a global function with example usage: test_simple_product_tuples() without return types