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8fd3a743 - Fix using non-square images with UNet2DModel and DDIM/DDPM pipelines (#1289)

Fix using non-square images with UNet2DModel and DDIM/DDPM pipelines (#1289) * fix non square images with UNet2DModel and DDIM/DDPM pipelines * fix unet_2d `sample_size` docstring * update pipeline tests for unet uncond Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>