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* Added explanation of 'strength' parameter * Added get_timesteps function which relies on new strength parameter * Added `strength` parameter which defaults to 1. * Swapped ordering so `noise_timestep` can be calculated before masking the image this is required when you aren't applying 100% noise to the masked region, e.g. strength < 1. * Added strength to check_inputs, throws error if out of range * Changed `prepare_latents` to initialise latents w.r.t strength inspired from the stable diffusion img2img pipeline, init latents are initialised by converting the init image into a VAE latent and adding noise (based upon the strength parameter passed in), e.g. random when strength = 1, or the init image at strength = 0. * WIP: Added a unit test for the new strength parameter in the StableDiffusionInpaintingPipeline still need to add correct regression values * Created a is_strength_max to initialise from pure random noise * Updated unit tests w.r.t new strength parameter + fixed new strength unit test * renamed parameter to avoid confusion with variable of same name * Updated regression values for new strength test - now passes * removed 'copied from' comment as this method is now different and divergent from the cpy * Update src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_inpaint.py Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com> * Ensure backwards compatibility for prepare_mask_and_masked_image created a return_image boolean and initialised to false * Ensure backwards compatibility for prepare_latents * Fixed copy check typo * Fixes w.r.t backward compibility changes * make style * keep function argument ordering same for backwards compatibility in callees with copied from statements * make fix-copies --------- Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com> Co-authored-by: William Berman <WLBberman@gmail.com>