code: def single_var_loop(strat, iterable):
      s = 0
      for pr in iterable:
          # TODO(mdan): It would be nice to be able to write s = s * 10 + pr.
          s = s * 10 + strat.reduce("SUM", pr, axis=0)
      return s
  
imports: import itertools
  from absl.testing import parameterized
  import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 2 for calling a global function with example usage: single_var_loop(strat, iterable) and returns: s