what "offline tokenizers" have you tried?

[xiabingquan]

Hi there. Thanks for the great work.
In the paper, you mentioned that "We also consider a cross-entropy loss with patches converted to discrete tokens using an offline tokenizer".
Recently, I've been working on a relevant project in which I want to tokenize images into discretized tokens in an unsupervised way (e.g. VQ-GAN).
I'm wondering what offline tokenizers you've tried.
Any help will be appreciated. Thanks!😀