def create_g2p_gt_map(words, pronunciations):
  """Create grapheme-to-phoneme ground true mapping."""
  g2p_gt_map = {}
  for word, pronunciation in zip(words, pronunciations):
    if word in g2p_gt_map:
      g2p_gt_map[word].append(pronunciation)
    else:
      g2p_gt_map[word] = [pronunciation]
  return g2p_gt_map