diff --git a/paddlespeech/s2t/exps/wav2vec2/bin/test.py b/paddlespeech/s2t/exps/wav2vec2/bin/test.py
index d1a6fd40591da478894df8b66f075f9918dec729..a376651df3ce67907022b5b2b36d3609ba90b2de 100644
--- a/paddlespeech/s2t/exps/wav2vec2/bin/test.py
+++ b/paddlespeech/s2t/exps/wav2vec2/bin/test.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/paddlespeech/s2t/exps/wav2vec2/bin/test_wav.py b/paddlespeech/s2t/exps/wav2vec2/bin/test_wav.py
index 3a537bce5251ac5e8355aa90dae8998815d9e085..0d66ac41075781b6bdf84216d255d4fd7c0a1ec0 100644
--- a/paddlespeech/s2t/exps/wav2vec2/bin/test_wav.py
+++ b/paddlespeech/s2t/exps/wav2vec2/bin/test_wav.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/paddlespeech/s2t/exps/wav2vec2/bin/train.py b/paddlespeech/s2t/exps/wav2vec2/bin/train.py
index b2edecca1705e72926fca9f86799cc874ee30232..3ae3a9e732c9cbd3fc27eba67506f665e239c5ae 100644
--- a/paddlespeech/s2t/exps/wav2vec2/bin/train.py
+++ b/paddlespeech/s2t/exps/wav2vec2/bin/train.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/paddlespeech/s2t/exps/wav2vec2/model.py b/paddlespeech/s2t/exps/wav2vec2/model.py
index 16feac5de26ff2d14ea55617495af6e13d509101..933e268edacfdb82a5b7905fbffebd86f31346ff 100644
--- a/paddlespeech/s2t/exps/wav2vec2/model.py
+++ b/paddlespeech/s2t/exps/wav2vec2/model.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/paddlespeech/s2t/models/wav2vec2/modules/VanillaNN.py b/paddlespeech/s2t/models/wav2vec2/modules/VanillaNN.py
index ae141d1b34b9d35e95e051ebce3e68768b6de19e..cfd8f507e13e18a119fb799bc5368b19bd6cbc3d 100644
--- a/paddlespeech/s2t/models/wav2vec2/modules/VanillaNN.py
+++ b/paddlespeech/s2t/models/wav2vec2/modules/VanillaNN.py
@@ -1,7 +1,19 @@
-"""Vanilla Neural Network for simple tests.
-Authors
-* Elena Rastorgueva 2020
-"""
+# Authors
+# * Elena Rastorgueva 2020
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+# Modified from speechbrain(https://github.com/speechbrain/speechbrain/blob/develop/speechbrain/lobes/models/VanillaNN.py).
 import paddle
 
 from paddlespeech.s2t.models.wav2vec2.modules import containers
diff --git a/paddlespeech/s2t/models/wav2vec2/modules/activations.py b/paddlespeech/s2t/models/wav2vec2/modules/activations.py
index 722d8a0d6055170caaffa86a4989af84568c5429..af42b8a479fe4ea1fb83194f27cf08d512a32cc1 100644
--- a/paddlespeech/s2t/models/wav2vec2/modules/activations.py
+++ b/paddlespeech/s2t/models/wav2vec2/modules/activations.py
@@ -1,3 +1,4 @@
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 # Copyright 2020 The HuggingFace Team. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/s2t/models/wav2vec2/modules/containers.py b/paddlespeech/s2t/models/wav2vec2/modules/containers.py
index b39733570c672c3ee71f2b952f060fccdcf8d458..180d0bd321b0e67187331ccab11ee3b04ade6404 100644
--- a/paddlespeech/s2t/models/wav2vec2/modules/containers.py
+++ b/paddlespeech/s2t/models/wav2vec2/modules/containers.py
@@ -1,3 +1,19 @@
+# Authors
+#  * Peter Plantinga 2020
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+# Modified from speechbrain(https://github.com/speechbrain/speechbrain/blob/develop/speechbrain/nnet/containers.py).
 import inspect
 
 import paddle
diff --git a/paddlespeech/s2t/models/wav2vec2/modules/linear.py b/paddlespeech/s2t/models/wav2vec2/modules/linear.py
index 488949d14121e0dd385c605148faa8a73b7db7a7..adae4514af8a3b6f65c5a0987db83d6c4ca4db6f 100644
--- a/paddlespeech/s2t/models/wav2vec2/modules/linear.py
+++ b/paddlespeech/s2t/models/wav2vec2/modules/linear.py
@@ -1,8 +1,20 @@
-"""Library implementing linear transformation.
-Authors
- * Mirco Ravanelli 2020
- * Davide Borra 2021
-"""
+# Authors
+#  * Mirco Ravanelli 2020
+#  * Davide Borra 2021
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+# Modified from speechbrain(https://github.com/speechbrain/speechbrain/blob/develop/speechbrain/nnet/linear.py).
 import logging
 
 import paddle
diff --git a/paddlespeech/s2t/models/wav2vec2/modules/modeling_outputs.py b/paddlespeech/s2t/models/wav2vec2/modules/modeling_outputs.py
index fb2a87122f4f0bac200aa184729f437e7af9fa4e..ab623a996587e461ba59219a97a01a844cc6c6c4 100644
--- a/paddlespeech/s2t/models/wav2vec2/modules/modeling_outputs.py
+++ b/paddlespeech/s2t/models/wav2vec2/modules/modeling_outputs.py
@@ -1,3 +1,4 @@
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 # Copyright 2020 The HuggingFace Team. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/s2t/models/wav2vec2/modules/modeling_wav2vec2.py b/paddlespeech/s2t/models/wav2vec2/modules/modeling_wav2vec2.py
index 3d5e5fa64f9bfd34cb9b2a445f95f73da2dd53b0..e484fff6821ed4e4f7c7547e66996c021da67105 100644
--- a/paddlespeech/s2t/models/wav2vec2/modules/modeling_wav2vec2.py
+++ b/paddlespeech/s2t/models/wav2vec2/modules/modeling_wav2vec2.py
@@ -1,4 +1,4 @@
-# coding=utf-8
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 # Copyright 2021 The Fairseq Authors and the HuggingFace Inc. team. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/s2t/models/wav2vec2/processing/signal_processing.py b/paddlespeech/s2t/models/wav2vec2/processing/signal_processing.py
index 9998a8e5e43183a633d64fdbd3e573ccd5516b5c..0c4ade7b76fdbd8322fe604b30ad217fb10aaf3e 100644
--- a/paddlespeech/s2t/models/wav2vec2/processing/signal_processing.py
+++ b/paddlespeech/s2t/models/wav2vec2/processing/signal_processing.py
@@ -1,12 +1,23 @@
-"""
-Low level signal processing utilities
-Authors
- * Peter Plantinga 2020
- * Francois Grondin 2020
- * William Aris 2020
- * Samuele Cornell 2020
- * Sarthak Yadav 2022
-"""
+# Authors
+#  * Peter Plantinga 2020
+#  * Francois Grondin 2020
+#  * William Aris 2020
+#  * Samuele Cornell 2020
+#  * Sarthak Yadav 2022
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+# Modified from speechbrain(https://github.com/speechbrain/speechbrain/blob/develop/speechbrain/processing/signal_processing.py)
 import numpy as np
 import paddle
 
diff --git a/paddlespeech/s2t/models/wav2vec2/processing/speech_augmentation.py b/paddlespeech/s2t/models/wav2vec2/processing/speech_augmentation.py
index 471ab76572f52e9d89a27d1c844c9bd1d79282bf..78a0782e72b9e773c8bf2a9def23b37956ce7314 100644
--- a/paddlespeech/s2t/models/wav2vec2/processing/speech_augmentation.py
+++ b/paddlespeech/s2t/models/wav2vec2/processing/speech_augmentation.py
@@ -1,3 +1,19 @@
+# Authors
+# * Peter Plantinga 2020
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+# Modified from speechbrain(https://github.com/speechbrain/speechbrain/blob/develop/speechbrain/processing/speech_augmentation.py)
 import math
 
 import paddle
diff --git a/paddlespeech/s2t/models/wav2vec2/wav2vec2_ASR.py b/paddlespeech/s2t/models/wav2vec2/wav2vec2_ASR.py
index 0d99e87081b1e0bd68283ca3e50bd6f8af010027..e133477408b16f7b91c8b0d66f6e86fd81d8eafa 100644
--- a/paddlespeech/s2t/models/wav2vec2/wav2vec2_ASR.py
+++ b/paddlespeech/s2t/models/wav2vec2/wav2vec2_ASR.py
@@ -1,3 +1,16 @@
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
 from collections import defaultdict
 from typing import Dict
 from typing import List