fix redux multiple ref images (#192)

Author: qzzz95

diffsynth_engine/pipelines/flux_image.py

@@ -983,8 +983,9 @@ def __call__(
         elif self.ip_adapter is not None:
             image_emb = self.ip_adapter.encode_image(ref_image)
         elif self.redux is not None:
-            image_prompt_embeds = self.redux(ref_image)
-            positive_prompt_emb = torch.cat([positive_prompt_emb, image_prompt_embeds], dim=1)
+            ref_prompt_embeds = self.redux(ref_image)
+            flattened_ref_emb = ref_prompt_embeds.view(1, -1, ref_prompt_embeds.size(-1))
+            positive_prompt_emb = torch.cat([positive_prompt_emb, flattened_ref_emb], dim=1)
 
         # Extra input
         image_ids, text_ids, guidance = self.prepare_extra_input(