code: def _load_data():
      
      lines = dragonmapper.data.load_data_file('transcriptions.csv')
      pinyin_map, zhuyin_map, ipa_map = {}, {}, {}
      for line in lines:
          p, z, i = line.split(',')
          pinyin_map[p] = {'Zhuyin': z, 'IPA': i}
          zhuyin_map[z] = {'Pinyin': p, 'IPA': i}
          ipa_map[i] = {'Pinyin': p, 'Zhuyin': z}
      return pinyin_map, zhuyin_map, ipa_map
docs: Load the transcription mapping data into a dictionary.