code: def roundTo1(field: float) -> FrozenSet[str]:
      abs_num = abs(field)
      order = int(floor(log10(abs_num)))
      rounded = round(abs_num, -order)
      return frozenset((str(int(copysign(rounded, field))),))
  
imports: import re
  from itertools import chain
  from math import copysign, floor, log10
  from typing import Any, FrozenSet, Sequence, Tuple, Union
  from doublemetaphone import doublemetaphone
  from dedupe.cpredicates import initials, ngrams, unique_ngrams
label_desc: Use image node_id 35 for calling a global function with example usage: roundTo1(field) and returns: frozenset