add the xm.mark_step for the first denosing loop (#10530)

* Update rerender_a_video.py

* Update rerender_a_video.py

* Update examples/community/rerender_a_video.py
Co-authored-by: hlky <hlky@hlky.ac>

* Update rerender_a_video.py

* make style

---------
Co-authored-by: hlky <hlky@hlky.ac>
Co-authored-by: YiYi Xu <yixu310@gmail.com>

examples/community/rerender_a_video.py

@@ -908,6 +908,9 @@ class RerenderAVideoPipeline(StableDiffusionControlNetImg2ImgPipeline):
                     if callback is not None and i % callback_steps == 0:
                         callback(i, t, latents)
 
+                if XLA_AVAILABLE:
+                    xm.mark_step()
+
         if not output_type == "latent":
             image = self.vae.decode(latents / self.vae.config.scaling_factor, return_dict=False)[0]
         else: