Are there any diffusion-based or otherwise non-transformer-based models in mainstream use?
If you include non-language models, yes.
If by mainstream you mean "ChatGPT" or "Claude", then no.
But also, no one really knows as they're closed.
If you include non-language models, yes.
If by mainstream you mean "ChatGPT" or "Claude", then no.
But also, no one really knows as they're closed.