code: def __call__(self, s: str):
      s = s.lower()
      s = re.sub(
          r"[<\[][^>\]]*[>\]]", "", s
      )  # remove words between brackets
      s = re.sub(
          r"\(([^)]+?)\)", "", s
      )  # remove words between parenthesis
      s = self.clean(s).lower()
  
      if self.split_letters:
          s = " ".join(regex.findall(r"\X", s, regex.U))
  
      s = re.sub(
          r"\s+", " ", s
      )  # replace any successive whitespace characters with a space
  
      return s
  
file_path: whisper/whisper/normalizers/basic.py
imports: import re
  import unicodedata
  import regex
label_desc: Use image node_id 2 for calling the BasicTextNormalizer obj's underlying member method code with example usage: obj.__call__(s) and returns: s