code: def _should_keep_symbol(s):
      """whether to keep a certain symbol"""
      return s in _symbol_to_id and s != "_" and s != "~"
  
file_path: speechbrain/speechbrain/utils/text_to_sequence.py
imports: import re
  import logging
label_desc: Use image node_id 14 for calling a global function with example usage: _should_keep_symbol(s) and returns: unknown