code: def validate_aspect(s):
      if s in ("auto", "equal"):
          return s
      try:
          return float(s)
      except ValueError as e:
          raise ValueError("not a valid aspect specification") from e
  
imports: import ast
  from functools import lru_cache, reduce
  from numbers import Real
  import operator
  import os
  import re
  import numpy
  from matplotlib import _api, cbook
  from matplotlib.cbook import ls_mapper
  from matplotlib.colors import Colormap, is_color_like
  from matplotlib._fontconfig_pattern import parse_fontconfig_pattern
  from matplotlib._enums import JoinStyle, CapStyle
  from cycler import Cycler, cycler
label_desc: Use image node_id 19 for calling a global function with example usage: validate_aspect(s) and returns: s, float