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--fp8_e4m3fn-unet and --fp8_e5m2-unet are the two different formats
supported by pytorch.

Now everything in transformer_options gets put in extra_options.

DDIM is the same as euler with a small difference in the inpaint code.
DDIM uses randn_like but I set a fixed seed instead.

I'm keeping it in because I'm sure if I remove it people are going to
complain.

There's no reason for the whole CrossAttention object to be repeated when
only the operation in the middle changes.