[misc] upgrade format to py39 (#7256)

src/llamafactory/model/model_utils/moe.py

@@ -12,7 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from typing import TYPE_CHECKING, Sequence
+from collections.abc import Sequence
+from typing import TYPE_CHECKING
 
 import torch
 from transformers.integrations import is_deepspeed_zero3_enabled
@@ -34,9 +35,7 @@ def _set_z3_leaf_modules(model: "PreTrainedModel", leaf_modules: Sequence["torch
 
 
 def add_z3_leaf_module(model: "PreTrainedModel") -> None:
-    r"""
-    Sets module as a leaf module to skip partitioning in deepspeed zero3.
-    """
+    r"""Set module as a leaf module to skip partitioning in deepspeed zero3."""
     if not is_deepspeed_zero3_enabled():
         return