Remove latent upscale CPU fallback

dumas_h3_latent_upscale.py

@@ -604,21 +604,10 @@ def upscale_video_model(video, param):
             raise
         smaller = _shrink_model_tile_param(param)
         if smaller is None:
-            if str(param.get("device", "cuda")) != "cpu":
-                cpu_param = dict(param)
-                cpu_param["device"] = "cpu"
-                cpu_param["precision"] = "fp32"
-                try:
-                    gc.collect()
-                except Exception:
-                    pass
-                if torch.cuda.is_available():
-                    try:
-                        torch.cuda.empty_cache()
-                    except Exception:
-                        pass
-                return upscale_video_model(video, cpu_param)
-            raise
+            raise RuntimeError(
+                "H3 latent upscale exhausted its GPU spatial fallbacks. "
+                "Reduce the target size, tile size, or split the shot earlier."
+            ) from exc
         try:
             gc.collect()
         except Exception: