docs: def _yield_subpatches(patch, splits, name='split'):
      """
      Iterator for subtables defined by a splits string
  
      Parameters
      ----------
      patch : obj
          Patch object containing data to subset
      splits : str
          Specifies how a column of a dataset should be split. See Notes.
  
      Yields
      ------
      tuple
          First element is subset string, second is subtable dataframe
  
      Notes
      -----
      {0}
  
      """
  
      if splits:
          subset_list = _parse_splits(patch, splits)
          for subset in subset_list:
              logging.info('Analyzing subset %s: %s' % (name, subset))
              subpatch = copy.copy(patch)
              subpatch.table = _subset_table(patch.table, subset)
              subpatch.meta, subpatch.incremented = _subset_meta(patch.meta,
                                                  subset, incremented=True)
  
              yield subset, subpatch
      else:
          yield '', patch