message: Removed redundant use of enumeration
  Since every mask has an accompanying threshold, zip(masks, thresholds) can be used instead of enumerate(masks) and calling thresholds by index.
diff: @@ -518,11 +518,10 @@ class Pruning(object):
  summary.scalar('last_mask_update_step', self._last_update_step)
  masks = get_masks()
  thresholds = get_thresholds()
  - for index, mask in enumerate(masks):
  + for mask, threshold in zip(masks, thresholds):
  if not self._exists_in_do_not_prune_list(mask.name):
  summary.scalar(mask.op.name + '/sparsity', nn_impl.zero_fraction(mask))
  - summary.scalar(thresholds[index].op.name + '/threshold',
  - thresholds[index])
  + summary.scalar(threshold.op.name + '/threshold', threshold)
  def print_hparams(self):
  logging.info(self._spec.to_json())
  