code: def g2p(text):
      """Convert grapheme to phoneme."""
      tokens = filter(lambda s: s != " ", f_g2p(text))
      return " ".join(tokens)
  
imports: import argparse
  import codecs
  import nltk
  from tacotron_cleaner.cleaners import collapse_whitespace, custom_english_cleaners, expand_abbreviations, expand_numbers, expand_symbols, lowercase, remove_unnecessary_symbols, uppercase
label_desc: Use image node_id 1 for calling a global function with example usage: g2p(text) and returns: str