diff --git a/verl/models/transformers/llama.py b/verl/models/transformers/llama.py
index cd06237..4e8a5b1 100644
--- a/verl/models/transformers/llama.py
+++ b/verl/models/transformers/llama.py
@@ -1,3 +1,17 @@
+# Copyright 2024 Bytedance Ltd. and/or its affiliates
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import os
 import torch
 from typing import Optional, List, Union, Tuple, Unpack, Callable
diff --git a/verl/models/transformers/qwen2.py b/verl/models/transformers/qwen2.py
index d4fdfea..05927b5 100644
--- a/verl/models/transformers/qwen2.py
+++ b/verl/models/transformers/qwen2.py
@@ -1,3 +1,17 @@
+# Copyright 2024 Bytedance Ltd. and/or its affiliates
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import os
 import torch
 from typing import Optional, List, Union, Tuple, Unpack, Callable
diff --git a/verl/workers/fsdp_workers.py b/verl/workers/fsdp_workers.py
index 52dfe55..510d5db 100644
--- a/verl/workers/fsdp_workers.py
+++ b/verl/workers/fsdp_workers.py
@@ -243,8 +243,10 @@ def _build_model_optimizer(self,
     def _build_rollout(self):
         from torch.distributed.device_mesh import init_device_mesh
         # TODO(sgm): support FSDP hybrid shard for larger model
-        dp = self.world_size // self.config.tensor_model_parallel_size
-        rollout_device_mesh = init_device_mesh('cuda', mesh_shape=(dp, self.config.tensor_model_parallel_size), mesh_dim_names=['dp', 'infer_tp'])
+        infer_tp = self.config.rollout.tensor_model_parallel_size
+        dp = self.world_size // infer_tp
+        assert self.world_size % infer_tp == 0, f'rollout world_size: {self.world_size} is not divisible by infer_tp: {infer_tp}'
+        rollout_device_mesh = init_device_mesh('cuda', mesh_shape=(dp, infer_tp), mesh_dim_names=['dp', 'infer_tp'])
 
         if self.config.rollout.name == 'hf':
             from verl.workers.rollout import HFRollout