remove syncs before denoising in Kontext (#11818)

Author: sayakpaul

src/diffusers/pipelines/flux/pipeline_flux.py

@@ -898,6 +898,8 @@ def __call__(
             )
 
         # 6. Denoising loop
+        # We set the index here to remove DtoH sync, helpful especially during compilation.
+        # Check out more details here: https://github.com/huggingface/diffusers/pull/11696
         self.scheduler.set_begin_index(0)
         with self.progress_bar(total=num_inference_steps) as progress_bar:
             for i, t in enumerate(timesteps):

src/diffusers/pipelines/flux/pipeline_flux_kontext.py

@@ -1043,6 +1043,9 @@ def __call__(
             )
 
         # 6. Denoising loop
+        # We set the index here to remove DtoH sync, helpful especially during compilation.
+        # Check out more details here: https://github.com/huggingface/diffusers/pull/11696
+        self.scheduler.set_begin_index(0)
         with self.progress_bar(total=num_inference_steps) as progress_bar:
             for i, t in enumerate(timesteps):
                 if self.interrupt: