How accurate is CMU Sphinx for speech recognition compared to what's inside Alexa?
Kaldi is much better, but very difficult to set up.
None of the open source speech recognition systems (or commercial for that matter) come close to Google.
Takes the pain out of it
Is that because of the data they have, or because of their superior algorithms?
If, suddenly, someone would apply the fact that copyright bans remixes to training of neural networks, and apply the fact that licenses for this have to be granted explicitly, Google would lose 90% of their advantage over other companies.
Personally, I’d be for making a requirement that companies open source their trained models if the training data contained data supplied by users, not paid employees.