Why is " " used as the blank in the CTCLoss?

[jamesparsloe]

Hey @yl4579 thank you for your great work on this (and StyleTTS).

I was wondering if there was a reason for using " " as the blank token in the CTCLoss instead of something distinct from what can be returned from G2p as is suggested here? I was thinking of using something like id 80 if appending onto the vocab defined here.

Was wondering if this would affect the downstream training of StyleTTS much or if the aligner just has to be a "good enough" starting point?

Thanks!