fix to work with cfg scale=1

sdxl_gen_img.py

@@ -504,7 +504,8 @@ def __call__(
         uncond_embeddings = tes_uncond_embs[0]
         for i in range(1, len(tes_text_embs)):
             text_embeddings = torch.cat([text_embeddings, tes_text_embs[i]], dim=2)  # n,77,2048
-            uncond_embeddings = torch.cat([uncond_embeddings, tes_uncond_embs[i]], dim=2)  # n,77,2048
+            if do_classifier_free_guidance:
+                uncond_embeddings = torch.cat([uncond_embeddings, tes_uncond_embs[i]], dim=2)  # n,77,2048
 
         if do_classifier_free_guidance:
             if negative_scale is None:
@@ -567,9 +568,11 @@ def __call__(
             text_pool = clip_vision_embeddings  # replace: same as ComfyUI (?)
 
         c_vector = torch.cat([text_pool, c_vector], dim=1)
-        uc_vector = torch.cat([uncond_pool, uc_vector], dim=1)
-
-        vector_embeddings = torch.cat([uc_vector, c_vector])
+        if do_classifier_free_guidance:
+            uc_vector = torch.cat([uncond_pool, uc_vector], dim=1)
+            vector_embeddings = torch.cat([uc_vector, c_vector])
+        else:
+            vector_embeddings = c_vector
 
         # set timesteps
         self.scheduler.set_timesteps(num_inference_steps, self.device)