About the data
The CMU Pronouncing Dictionary, © 1993–2015 Carnegie Mellon University, used under the BSD 2-Clause licence — read the licence. It transcribes North American English, so a British reader will disagree with it about words like “bath” and every word ending in “-er”.
It records phonemes but not vowel length, so you will see /u/ rather than /uː/. Where a word has more than one pronunciation, every one is listed above; the first is what the joined transcription uses.