fix bug for usp with refimage

diffsynth/pipelines/wan_video_new.py

@@ -1161,13 +1161,13 @@ def model_fn_wan_video(
         if tea_cache is not None:
             tea_cache.store(x)
             
-    if reference_latents is not None:
-        x = x[:, reference_latents.shape[1]:]
-        f -= 1
-
     x = dit.head(x, t)
     if use_unified_sequence_parallel:
         if dist.is_initialized() and dist.get_world_size() > 1:
             x = get_sp_group().all_gather(x, dim=1)
+    # Remove reference latents
+    if reference_latents is not None:
+        x = x[:, reference_latents.shape[1]:]
+        f -= 1
     x = dit.unpatchify(x, (f, h, w))
     return x

examples/wanvideo/README.md

@@ -173,7 +173,7 @@ Wan supports multiple acceleration techniques, including:
 * **Unified Sequence Parallel**: Sequence parallelism based on [xDiT](https://github.com/xdit-project/xDiT). Please refer to [this example](./acceleration/unified_sequence_parallel.py), and run it using the command: 
 
 ```shell
-pip install xfuser>=0.4.3
+pip install "xfuser[flash-attn]>=0.4.3"
 torchrun --standalone --nproc_per_node=8 examples/wanvideo/acceleration/unified_sequence_parallel.py
 ```