diff --git a/src/llamafactory/model/model_utils/packing.py b/src/llamafactory/model/model_utils/packing.py
index c60547d4..8ed313be 100644
--- a/src/llamafactory/model/model_utils/packing.py
+++ b/src/llamafactory/model/model_utils/packing.py
@@ -1,8 +1,43 @@
-# Copy from original implementation of src/axolotl/monkeypatch/multipack.py and src/axolotl/monkeypatch/utils.py from axolotl library with some changes
-"""
-Shared utils for the monkeypatches
-"""
-from typing import Optional, TYPE_CHECKING
+# Copyright 2024 Musab Gultekin and the LlamaFactory team.
+#
+# This code is based on the Musab Gultekin's functionary library.
+# https://github.com/MeetKai/functionary/blob/main/functionary/train/packing/monkey_patch_packing.py
+#
+# 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.
+#
+# MIT License
+#
+# Copyright (c) 2023 Musab Gultekin
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+from typing import TYPE_CHECKING, Optional
 
 import torch
 import torch.nn.functional as F
@@ -18,8 +53,8 @@ from transformers.modeling_attn_mask_utils import (
 )
 from transformers.utils import is_torch_bf16_gpu_available
 
+from ...extras.constants import SUPPORTED_CLASS_FOR_BLOCK_DIAG_ATTN
 from ...extras.logging import get_logger
-from ...extras.constants import SUPPORTED_CLASS_EFFECIENT_PACKING
 
 if TYPE_CHECKING:
     from transformers import PretrainedConfig