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Disable SDPA (PyTorch 2.0) in the VAE
Diffusers 0.16.0 made sdpa enabled by default in the vae. It had previously been enabled for the UNet, but of course that didn't affect this repo because it uses its own copy of the UNet.
This fix will not work for diffusers 0.16.0, but it will for 0.16.1 (just released today).
Fixes #173.
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