StableDiffusionDepth2ImgPipeline (#1531)
* begin depth pipeline
* add depth estimation model
* fix prepare_depth_mask
* add a comment about autocast
* copied from, quality, cleanup
* begin tests
* handle tensors
* norm image tensor
* fix batch size
* fix tests
* fix enable_sequential_cpu_offload
* fix save load
* fix test_save_load_float16
* fix test_save_load_optional_components
* fix test_float16_inference
* fix test_cpu_offload_forward_pass
* fix test_dict_tuple_outputs_equivalent
* up
* fix fast tests
* fix test_stable_diffusion_img2img_multiple_init_images
* fix few more fast tests
* don't use device map for DPT
* fix test_stable_diffusion_pipeline_with_sequential_cpu_offloading
* accept external depth maps
* prepare_depth_mask -> prepare_depth_map
* fix file name
* fix file name
* quality
* check transformers version
* fix test names
* use skipif
* fix import
* add docs
* skip tests on mps
* correct version
* uP
* Update docs/source/api/pipelines/stable_diffusion_2.mdx
* fix fix-copies
* fix fix-copies
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
Co-authored-by: anton- <anton@huggingface.co>
