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You can use the CLIPLoader to use the t5xxl only or the DualCLIPLoader to
use CLIP-L and CLIP-G only for sd3.

This is a different version of #3298 with more correct behavior.

* Add type annotation UnetWrapperFunction

* nit

* Add types.py

* Change calculation of memory total to be more accurate, allocated is actually smaller than reserved.

* Update README.md install documentation for Intel GPUs.

The previous fix didn't cover the case where the model was loaded in
lowvram mode right before.