Just speculation but it's possible they take advantage of the temporal aspect of writing to improve the training. Google recently used this technique to improve

Just speculation but it's possible they take advantage of the temporal aspect of writing to improve the training. Google recently used this technique to improve handwriting recognition: https://ai.googleblog.com/2019/03/rnn-based-handwriting-recognition-in.html?m=1 https://ai.googleblog.com/2019/03/rnn-based-handwriting-reco...