Enable image resizing to adjust its height and width in StableDiffusionXLInstructPix2PixPipeline (#6581)

* Enable image resizing to adjust its height and width in StableDiffusionXLInstructPix2PixPipeline

* Ensure that validation is performed at every 'validation_step', not at every step

Author: kim-sangyeon

examples/instruct_pix2pix/train_instruct_pix2pix_sdxl.py

@@ -1109,7 +1109,7 @@ def collate_fn(examples):
             progress_bar.set_postfix(**logs)
 
             ### BEGIN: Perform validation every `validation_epochs` steps
-            if global_step % args.validation_steps == 0 or global_step == 1:
+            if global_step % args.validation_steps == 0:
                 if (args.val_image_url_or_path is not None) and (args.validation_prompt is not None):
                     logger.info(
                         f"Running validation... \n Generating {args.num_validation_images} images with prompt:"

src/diffusers/pipelines/stable_diffusion_xl/pipeline_stable_diffusion_xl_instruct_pix2pix.py

@@ -858,7 +858,7 @@ def __call__(
         )
 
         # 4. Preprocess image
-        image = self.image_processor.preprocess(image).to(device)
+        image = self.image_processor.preprocess(image, height=height, width=width).to(device)
 
         # 5. Prepare timesteps
         self.scheduler.set_timesteps(num_inference_steps, device=device)