Avoid creating tensor in CosmosAttnProcessor2_0 (#11761) (#11763)

* Avoid creating tensor in CosmosAttnProcessor2_0 (#11761)

* up

---------

Co-authored-by: yiyixuxu <yixu310@gmail.com>

Author: chenxiao111222

src/diffusers/models/transformers/transformer_cosmos.py

@@ -187,9 +187,15 @@ def __call__(
             key = apply_rotary_emb(key, image_rotary_emb, use_real=True, use_real_unbind_dim=-2)
 
         # 4. Prepare for GQA
-        query_idx = torch.tensor(query.size(3), device=query.device)
-        key_idx = torch.tensor(key.size(3), device=key.device)
-        value_idx = torch.tensor(value.size(3), device=value.device)
+        if torch.onnx.is_in_onnx_export():
+            query_idx = torch.tensor(query.size(3), device=query.device)
+            key_idx = torch.tensor(key.size(3), device=key.device)
+            value_idx = torch.tensor(value.size(3), device=value.device)
+
+        else:
+            query_idx = query.size(3)
+            key_idx = key.size(3)
+            value_idx = value.size(3)
         key = key.repeat_interleave(query_idx // key_idx, dim=3)
         value = value.repeat_interleave(query_idx // value_idx, dim=3)