That's indeed one way to implement predictive typing. Looking up the list of possible words is not expensive, you basically step through a small automaton. The

That's indeed one way to implement predictive typing. Looking up the list of possible words is not expensive, you basically step through a small automaton. The challenge is making the models small enough to fit it on a phone. See e.g.: http://hnk.ffzg.hr/bibl/acl2007/EMNLP-CoNLL2007/pdf/EMNLP-CoNLL200721.pdf http://hnk.ffzg.hr/bibl/acl2007/EMNLP-CoNLL2007/pdf/EMNLP-Co...