text: """ from https://github.com/keithito/tacotron """
  import re
  from tacotron2.text import cleaners
  from tacotron2.text.symbols import symbols
  
  
  # Mappings from symbol to numeric ID and vice versa:
  _symbol_to_id = {s: i for i, s in enumerate(symbols)}
  _id_to_symbol = {i: s for i, s in enumerate(symbols)}
  
  # Regular expression matching text enclosed in curly braces:
  _curly_re = re.compile(r'(.*?)\{(.+?)\}(.*)')
  
  
  def text_to_sequence(text, cleaner_names):
    '''Converts a string of text to a sequence of IDs corresponding to the symbols in the text.
      The text can optionally have ARPAbet sequences enclosed in curly braces embedded
      in it. For example, "Turn left on {HH AW1 S S T AH0 N} Street."
      Args:
        text: string to convert to a sequence
        cleaner_names: names of the cleaner functions to run the text through
      Returns:
        List of integers corresponding to the symbols in the text
    '''
    sequence = []
  
    # Check for curly braces and treat their contents as ARPAbet:
    while len(text):
      m = _curly_re.match(text)
      if not m:
        sequence += _symbols_to_sequence(_clean_text(text, cleaner_names))
        print('3')
        print(sequence)
        break
      sequence += _symbols_to_sequence(_clean_text(m.group(1), cleaner_names))
      sequence += _arpabet_to_sequence(m.group(2))
      
      text = m.group(3)
  
    return sequence
  
  
  def sequence_to_text(sequence):
    '''Converts a sequence of IDs back to a string'''
    result = ''
    for symbol_id in sequence:
      if symbol_id in _id_to_symbol:
        s = _id_to_symbol[symbol_id]
        # Enclose ARPAbet back in curly braces:
        if len(s) > 1 and s[0] == '@':
          s = '{%s}' % s[1:]
        result += s
    return result.replace('}{', ' ')
  
  
  def _clean_text(text, cleaner_names):
    for name in cleaner_names:
      cleaner = getattr(cleaners, name)
      if not cleaner:
        raise Exception('Unknown cleaner: %s' % name)
      text = cleaner(text)
      #print("2")
      #print(text)
    return text
  
  
  def _symbols_to_sequence(symbols):
    return [_symbol_to_id[s] for s in symbols if _should_keep_symbol(s)]
  
  
  def _arpabet_to_sequence(text):
    return _symbols_to_sequence(['@' + s for s in text.split()])
  
  
  def _should_keep_symbol(s):
    return s in _symbol_to_id and s is not '_' and s is not '~'