diff --git a/paddlespeech/s2t/decoders/beam_search/beam_search.py b/paddlespeech/s2t/decoders/beam_search/beam_search.py
index 7d79246df9b8249258ec09aa8c51f812c401995c..f331cb1c93e1331aa25600e6b5b819212ed6f096 100644
--- a/paddlespeech/s2t/decoders/beam_search/beam_search.py
+++ b/paddlespeech/s2t/decoders/beam_search/beam_search.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """Beam search module."""
 from itertools import chain
 from typing import Any
diff --git a/paddlespeech/s2t/decoders/scorers/ctc.py b/paddlespeech/s2t/decoders/scorers/ctc.py
index e0ff3d5f963375457b65a0f3a2b34a039b24b657..ace80bd3eb8d3cf1639be03c244b43aacbba2ec4 100644
--- a/paddlespeech/s2t/decoders/scorers/ctc.py
+++ b/paddlespeech/s2t/decoders/scorers/ctc.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """ScorerInterface implementation for CTC."""
 import numpy as np
 import paddle
diff --git a/paddlespeech/s2t/decoders/scorers/length_bonus.py b/paddlespeech/s2t/decoders/scorers/length_bonus.py
index 2e4c84651969d910c9d2ed3dc56c3cfbe6487a8d..c5a76db886788cccde19b6d02e8c9611be78ebde 100644
--- a/paddlespeech/s2t/decoders/scorers/length_bonus.py
+++ b/paddlespeech/s2t/decoders/scorers/length_bonus.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """Length bonus module."""
 from typing import Any
 from typing import List
diff --git a/paddlespeech/s2t/decoders/scorers/ngram.py b/paddlespeech/s2t/decoders/scorers/ngram.py
index fa8f776af2144aeedb9d6ca20dc7ba62bcbbcfb7..f2600828dd2d0a89679c0b44421ea5fbc04e289e 100644
--- a/paddlespeech/s2t/decoders/scorers/ngram.py
+++ b/paddlespeech/s2t/decoders/scorers/ngram.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """Ngram lm implement."""
 from abc import ABC
 
diff --git a/paddlespeech/s2t/decoders/scorers/scorer_interface.py b/paddlespeech/s2t/decoders/scorers/scorer_interface.py
index ddc780da246ffa7a2438a2adf1e041f207ebab2c..3272e6b7aa0422a3ebbf45e3b6d2931a70fab784 100644
--- a/paddlespeech/s2t/decoders/scorers/scorer_interface.py
+++ b/paddlespeech/s2t/decoders/scorers/scorer_interface.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """Scorer interface module."""
 import warnings
 from typing import Any
diff --git a/paddlespeech/s2t/decoders/utils.py b/paddlespeech/s2t/decoders/utils.py
index 63709d1a94ba6aec29c3aa9ed8fffe7d05e8b19d..a609f1c6330dda817cd287fdaf6f6da7d94e26f6 100644
--- a/paddlespeech/s2t/decoders/utils.py
+++ b/paddlespeech/s2t/decoders/utils.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import numpy as np
 
 from paddlespeech.s2t.utils.log import Log
diff --git a/paddlespeech/s2t/io/batchfy.py b/paddlespeech/s2t/io/batchfy.py
index 9be37c2770a12fb7b66ab2e6152d78258fc2100c..f59fb24c9af48d02a523e159f5d7e199ca721cca 100644
--- a/paddlespeech/s2t/io/batchfy.py
+++ b/paddlespeech/s2t/io/batchfy.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import itertools
 
 import numpy as np
diff --git a/paddlespeech/s2t/io/converter.py b/paddlespeech/s2t/io/converter.py
index aacbad9806dc7df98bd1a64ea6bfb051c935790e..b217d2b1b4028bd0218561127bc4fa7409de6f45 100644
--- a/paddlespeech/s2t/io/converter.py
+++ b/paddlespeech/s2t/io/converter.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import numpy as np
 
 from paddlespeech.s2t.io.utility import pad_list
diff --git a/paddlespeech/s2t/io/dataset.py b/paddlespeech/s2t/io/dataset.py
index 4aff9fb2e8cfec691fb6c15e4aeede402e1c3a38..7c96cb432890ad483adf0911409e7cb6b00d881d 100644
--- a/paddlespeech/s2t/io/dataset.py
+++ b/paddlespeech/s2t/io/dataset.py
@@ -11,8 +11,8 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 from typing import Optional
 
 from paddle.io import Dataset
diff --git a/paddlespeech/s2t/io/reader.py b/paddlespeech/s2t/io/reader.py
index 1e32e620cbc6397ee5f1331ff2a9c50ce9facff9..e810662df377af2db05e128c1cbda9d2042afa89 100644
--- a/paddlespeech/s2t/io/reader.py
+++ b/paddlespeech/s2t/io/reader.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 from collections import OrderedDict
 
 import kaldiio
diff --git a/paddlespeech/s2t/models/asr_interface.py b/paddlespeech/s2t/models/asr_interface.py
index 76ba3e2cf05698930e3435849e029cc49256fb2e..8c2db279763dec086358fc544864b4895cf94f29 100644
--- a/paddlespeech/s2t/models/asr_interface.py
+++ b/paddlespeech/s2t/models/asr_interface.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """ASR Interface module."""
 import argparse
 
diff --git a/paddlespeech/s2t/models/lm/transformer.py b/paddlespeech/s2t/models/lm/transformer.py
index 3fadba1a39860602892aaed639e6c7a4aa575b75..85bd7c2329fbf416d254bd9eabcaaf181fe7db01 100644
--- a/paddlespeech/s2t/models/lm/transformer.py
+++ b/paddlespeech/s2t/models/lm/transformer.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 from typing import Any
 from typing import List
 from typing import Tuple
diff --git a/paddlespeech/s2t/models/lm_interface.py b/paddlespeech/s2t/models/lm_interface.py
index 02df874f15118bee522679c4dcb42ffe75f6f968..c8f3776a9e68afeca01ea27bafa2ae4becdbd44e 100644
--- a/paddlespeech/s2t/models/lm_interface.py
+++ b/paddlespeech/s2t/models/lm_interface.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """Language model interface."""
 import argparse
 
diff --git a/paddlespeech/s2t/models/st_interface.py b/paddlespeech/s2t/models/st_interface.py
index 66ba49da5d4eb190da57da42d7da0d3e0275f205..4d368590325b8f39baa804574b07dc7f4747eb54 100644
--- a/paddlespeech/s2t/models/st_interface.py
+++ b/paddlespeech/s2t/models/st_interface.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """ST Interface module."""
 from .asr_interface import ASRInterface
 from paddlespeech.s2t.utils.dynamic_import import dynamic_import
diff --git a/paddlespeech/s2t/modules/attention.py b/paddlespeech/s2t/modules/attention.py
index 5cb37ee7fca6e7837bbdc4f00fb5698f7327d3c9..80eaf97542b090adec271570ce991e693b61e124 100644
--- a/paddlespeech/s2t/modules/attention.py
+++ b/paddlespeech/s2t/modules/attention.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Multi-Head Attention layer definition."""
 import math
 from typing import Optional
diff --git a/paddlespeech/s2t/modules/cmvn.py b/paddlespeech/s2t/modules/cmvn.py
index df529c1c49a23992a368f85bafdb81e212ce9081..6e97f82458921bf287778b0e95a869ca54950138 100644
--- a/paddlespeech/s2t/modules/cmvn.py
+++ b/paddlespeech/s2t/modules/cmvn.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 import paddle
 from paddle import nn
 
diff --git a/paddlespeech/s2t/modules/conformer_convolution.py b/paddlespeech/s2t/modules/conformer_convolution.py
index b4632d42928f02d7de5c5e892835037ba522c1aa..7601a5cca607df2820ba45583190516b2c80a48c 100644
--- a/paddlespeech/s2t/modules/conformer_convolution.py
+++ b/paddlespeech/s2t/modules/conformer_convolution.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """ConvolutionModule definition."""
 from typing import Optional
 from typing import Tuple
diff --git a/paddlespeech/s2t/modules/decoder.py b/paddlespeech/s2t/modules/decoder.py
index bd3760c483c81beacc4372a82efcdb740d5d3f2c..b0ab869a212b2fb3f9b9216e9f41f4b8b07b0fe0 100644
--- a/paddlespeech/s2t/modules/decoder.py
+++ b/paddlespeech/s2t/modules/decoder.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Decoder definition."""
 from typing import Any
 from typing import List
diff --git a/paddlespeech/s2t/modules/decoder_layer.py b/paddlespeech/s2t/modules/decoder_layer.py
index 62682bfbef40135ce82d798e0d2acadae2a6e4e7..4d516068239beac686c116846d75a3dbebcd8194 100644
--- a/paddlespeech/s2t/modules/decoder_layer.py
+++ b/paddlespeech/s2t/modules/decoder_layer.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Decoder self-attention layer definition."""
 from typing import Optional
 from typing import Tuple
diff --git a/paddlespeech/s2t/modules/embedding.py b/paddlespeech/s2t/modules/embedding.py
index 2b92aafe64fe017070da04a3f71a9a2cc8d7ccf2..9207658f99bec9d9bcec8425d7f8a74f2bc146f5 100644
--- a/paddlespeech/s2t/modules/embedding.py
+++ b/paddlespeech/s2t/modules/embedding.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Positonal Encoding Module."""
 import math
 from typing import Tuple
diff --git a/paddlespeech/s2t/modules/encoder.py b/paddlespeech/s2t/modules/encoder.py
index bf9cfeaa67690794313399dfeca7e471f3cb0111..0cde5b9f2360f005565d17c68cd7384b74039a2c 100644
--- a/paddlespeech/s2t/modules/encoder.py
+++ b/paddlespeech/s2t/modules/encoder.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Encoder definition."""
 from typing import List
 from typing import Optional
diff --git a/paddlespeech/s2t/modules/encoder_layer.py b/paddlespeech/s2t/modules/encoder_layer.py
index 7cff5442f0a5c642fb1380e205d6fb34ecd6e8e9..29d5a2d872e61a7f8aec7ace9bde05829043b08c 100644
--- a/paddlespeech/s2t/modules/encoder_layer.py
+++ b/paddlespeech/s2t/modules/encoder_layer.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Encoder self-attention layer definition."""
 from typing import Optional
 from typing import Tuple
diff --git a/paddlespeech/s2t/modules/loss.py b/paddlespeech/s2t/modules/loss.py
index 90f941f7ae3a9ccf2f5ab7a5c31c6b20125534eb..5750f5a0f79e8b2bce0f89b7f68c4c696d9e85f8 100644
--- a/paddlespeech/s2t/modules/loss.py
+++ b/paddlespeech/s2t/modules/loss.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 import inspect
 
 import paddle
diff --git a/paddlespeech/s2t/modules/mask.py b/paddlespeech/s2t/modules/mask.py
index 964d5086f05f296d2d02c6d154c2b585ae912d1b..6576cb9221e027feeaee4651b2f73795fa174225 100644
--- a/paddlespeech/s2t/modules/mask.py
+++ b/paddlespeech/s2t/modules/mask.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 import paddle
 
 from paddlespeech.s2t.utils.log import Log
diff --git a/paddlespeech/s2t/modules/positionwise_feed_forward.py b/paddlespeech/s2t/modules/positionwise_feed_forward.py
index 0d9c2e296c885d3c9911df5513cb8ad0bc299df2..347264e9d6cd9211f2c54ca556e99ba36cd1ae71 100644
--- a/paddlespeech/s2t/modules/positionwise_feed_forward.py
+++ b/paddlespeech/s2t/modules/positionwise_feed_forward.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Positionwise feed forward layer definition."""
 import paddle
 from paddle import nn
diff --git a/paddlespeech/s2t/modules/subsampling.py b/paddlespeech/s2t/modules/subsampling.py
index b60a6b1cdc70f1525fdf428d31b1dc0f1d50cf5c..759bd540f5b0149a03ef70ab6353bdcd6817d16d 100644
--- a/paddlespeech/s2t/modules/subsampling.py
+++ b/paddlespeech/s2t/modules/subsampling.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 """Subsampling layer definition."""
 from typing import Tuple
 
diff --git a/paddlespeech/s2t/training/extensions/evaluator.py b/paddlespeech/s2t/training/extensions/evaluator.py
index 5989e313527fed1e52213a830d5710d316e16882..b96a4818d18769452ecf92a7f7a640fddfdd8fe1 100644
--- a/paddlespeech/s2t/training/extensions/evaluator.py
+++ b/paddlespeech/s2t/training/extensions/evaluator.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 from typing import Dict
 
 import paddle
diff --git a/paddlespeech/s2t/training/extensions/extension.py b/paddlespeech/s2t/training/extensions/extension.py
index 1eb034273e5d45ea3a6dc36c174f226bce4a8f4b..7493213a05c62e06005ea5aefa6894dcde008a8e 100644
--- a/paddlespeech/s2t/training/extensions/extension.py
+++ b/paddlespeech/s2t/training/extensions/extension.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 PRIORITY_WRITER = 300
 PRIORITY_EDITOR = 200
 PRIORITY_READER = 100
diff --git a/paddlespeech/s2t/training/extensions/plot.py b/paddlespeech/s2t/training/extensions/plot.py
index d2e5e321f8770d8f8501b187dc9a0feb5bf502e0..7782b95b9d17b1530d7682e69b82f5882bb4d5d1 100644
--- a/paddlespeech/s2t/training/extensions/plot.py
+++ b/paddlespeech/s2t/training/extensions/plot.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import copy
 import os
 
diff --git a/paddlespeech/s2t/training/extensions/snapshot.py b/paddlespeech/s2t/training/extensions/snapshot.py
index fb4e80fee286cf085a3ce5418bf713ae2787f748..426bf72cdab9a81e5320a563fba6c6ce228435cd 100644
--- a/paddlespeech/s2t/training/extensions/snapshot.py
+++ b/paddlespeech/s2t/training/extensions/snapshot.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import os
 from datetime import datetime
 from pathlib import Path
diff --git a/paddlespeech/s2t/training/optimizer.py b/paddlespeech/s2t/training/optimizer.py
index f0bcb313ed291ba4f3a6c12ec817a6bb533a33ca..f7f70c5704b0f62eb733995a6c895799f78fe3b1 100644
--- a/paddlespeech/s2t/training/optimizer.py
+++ b/paddlespeech/s2t/training/optimizer.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 from typing import Any
 from typing import Dict
 from typing import Text
diff --git a/paddlespeech/s2t/training/reporter.py b/paddlespeech/s2t/training/reporter.py
index 22b2675211385a63ca1231067b885b78b37165e2..4d8eb2a1dd0a2dc865a9b3b48909e9c914673310 100644
--- a/paddlespeech/s2t/training/reporter.py
+++ b/paddlespeech/s2t/training/reporter.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import contextlib
 import math
 from collections import defaultdict
diff --git a/paddlespeech/s2t/training/scheduler.py b/paddlespeech/s2t/training/scheduler.py
index 732cbf0b5579ca21fc9b1ce67fa967361b7b6126..0222246e8649bd2b934cc60483e35c9c49224fef 100644
--- a/paddlespeech/s2t/training/scheduler.py
+++ b/paddlespeech/s2t/training/scheduler.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 from typing import Any
 from typing import Dict
 from typing import Text
diff --git a/paddlespeech/s2t/training/triggers/compare_value_trigger.py b/paddlespeech/s2t/training/triggers/compare_value_trigger.py
index 7c550268175a56ecf65aa522d9a7a6e4362f31dc..5c2a2721709e0a9b5376e5d5747f17b691c2c5ac 100644
--- a/paddlespeech/s2t/training/triggers/compare_value_trigger.py
+++ b/paddlespeech/s2t/training/triggers/compare_value_trigger.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 from ..reporter import DictSummary
 from .utils import get_trigger
 
diff --git a/paddlespeech/s2t/training/updaters/standard_updater.py b/paddlespeech/s2t/training/updaters/standard_updater.py
index a686af743d5622f4adf642fd0878a9ab279b0133..a320a80d2c724da20bc287f215b71d94fb9c78cc 100644
--- a/paddlespeech/s2t/training/updaters/standard_updater.py
+++ b/paddlespeech/s2t/training/updaters/standard_updater.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 from typing import Dict
 from typing import Optional
 
diff --git a/paddlespeech/s2t/training/updaters/trainer.py b/paddlespeech/s2t/training/updaters/trainer.py
index 5a1295eb3ebfa51e48e566faed090b125b5cc143..a0698c60a9c1318a417d3b71ee8906fb4f288bde 100644
--- a/paddlespeech/s2t/training/updaters/trainer.py
+++ b/paddlespeech/s2t/training/updaters/trainer.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import sys
 import traceback
 from collections import OrderedDict
diff --git a/paddlespeech/s2t/training/updaters/updater.py b/paddlespeech/s2t/training/updaters/updater.py
index 427722d2fe22606d8d94b733ab6bb22177d7b6a5..6875deb3d2bcf50bd962d66d3b7ee442ae1e4b39 100644
--- a/paddlespeech/s2t/training/updaters/updater.py
+++ b/paddlespeech/s2t/training/updaters/updater.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 from dataclasses import dataclass
 
 import paddle
diff --git a/paddlespeech/s2t/transform/add_deltas.py b/paddlespeech/s2t/transform/add_deltas.py
index 0a2f34198fd7fbd0f0a17e90a8c69d5f17c32179..1387fe9da643b4dce7ea7887d50d3f1119722661 100644
--- a/paddlespeech/s2t/transform/add_deltas.py
+++ b/paddlespeech/s2t/transform/add_deltas.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import numpy as np
 
 
diff --git a/paddlespeech/s2t/transform/channel_selector.py b/paddlespeech/s2t/transform/channel_selector.py
index bc8a14bf0273b1c4cc507aeeaa1ce7bb48800b34..b078dcf81b9edab3531160b097afbcebd1f807e4 100644
--- a/paddlespeech/s2t/transform/channel_selector.py
+++ b/paddlespeech/s2t/transform/channel_selector.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import numpy
 
 
diff --git a/paddlespeech/s2t/transform/cmvn.py b/paddlespeech/s2t/transform/cmvn.py
index 749d5e187e585094a3f306b90b1cfec11fc9d580..4d2d2324f660dd676d6774e8aedc37f0e7cb6585 100644
--- a/paddlespeech/s2t/transform/cmvn.py
+++ b/paddlespeech/s2t/transform/cmvn.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import io
 
 import h5py
diff --git a/paddlespeech/s2t/transform/functional.py b/paddlespeech/s2t/transform/functional.py
index afbf4a59f82fe204b06a4f80396ec20243f01530..ccb500819e171bada581811905737fbfd7af015d 100644
--- a/paddlespeech/s2t/transform/functional.py
+++ b/paddlespeech/s2t/transform/functional.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import inspect
 
 from paddlespeech.s2t.transform.transform_interface import TransformInterface
diff --git a/paddlespeech/s2t/transform/perturb.py b/paddlespeech/s2t/transform/perturb.py
index 8671420c102061341aef104de981369e36d4dacc..153d494bf76b7d1ea99c79caf16af88ddc70638c 100644
--- a/paddlespeech/s2t/transform/perturb.py
+++ b/paddlespeech/s2t/transform/perturb.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import librosa
 import numpy
 import scipy
diff --git a/paddlespeech/s2t/transform/spec_augment.py b/paddlespeech/s2t/transform/spec_augment.py
index 76e101848a4d949768ce3bdbca98cba083107baa..83e4e2e7502390dd2610c15923eabe0be694b802 100644
--- a/paddlespeech/s2t/transform/spec_augment.py
+++ b/paddlespeech/s2t/transform/spec_augment.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """Spec Augment module for preprocessing i.e., data augmentation"""
 import random
 
diff --git a/paddlespeech/s2t/transform/spectrogram.py b/paddlespeech/s2t/transform/spectrogram.py
index aeedf545bc8460af1b6e678e016fac38b2926fe1..df3130dadcd68e2416cc860cd41bb0e6c3d2c651 100644
--- a/paddlespeech/s2t/transform/spectrogram.py
+++ b/paddlespeech/s2t/transform/spectrogram.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import librosa
 import numpy as np
 
diff --git a/paddlespeech/s2t/transform/transform_interface.py b/paddlespeech/s2t/transform/transform_interface.py
index a7e04ffcf40db6c0cd94838d164e1c76b1f5a86e..8bc6242090b0f07c08d283401587762dbce08eee 100644
--- a/paddlespeech/s2t/transform/transform_interface.py
+++ b/paddlespeech/s2t/transform/transform_interface.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 
 
 class TransformInterface:
diff --git a/paddlespeech/s2t/transform/transformation.py b/paddlespeech/s2t/transform/transformation.py
index f0d1cd175cf1bd9f5783331753bfb22b7db938f8..1aee4b36f79479d5aa60d4d2148bb3431697bcde 100644
--- a/paddlespeech/s2t/transform/transformation.py
+++ b/paddlespeech/s2t/transform/transformation.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 """Transformation module."""
 import copy
 import io
diff --git a/paddlespeech/s2t/transform/wpe.py b/paddlespeech/s2t/transform/wpe.py
index 463810ddafd6af6bd7d15997d252795d6f94bd0c..777379d018b651d9edf7b9179833ab2968b4599d 100644
--- a/paddlespeech/s2t/transform/wpe.py
+++ b/paddlespeech/s2t/transform/wpe.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 from nara_wpe.wpe import wpe
 
 
diff --git a/paddlespeech/s2t/utils/check_kwargs.py b/paddlespeech/s2t/utils/check_kwargs.py
index 11214aac7370315fe1829e78161e998ea6f154d4..0aa839aca8bf177d39bd174db730413bfc8a3b90 100644
--- a/paddlespeech/s2t/utils/check_kwargs.py
+++ b/paddlespeech/s2t/utils/check_kwargs.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import inspect
 
 
diff --git a/paddlespeech/s2t/utils/cli_readers.py b/paddlespeech/s2t/utils/cli_readers.py
index a1742d4f0859b28e55a7d69c262f9783a5a79ffd..735d590dd97c44aa14de8113d9b0e204ac887010 100644
--- a/paddlespeech/s2t/utils/cli_readers.py
+++ b/paddlespeech/s2t/utils/cli_readers.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import io
 import logging
 import sys
diff --git a/paddlespeech/s2t/utils/cli_utils.py b/paddlespeech/s2t/utils/cli_utils.py
index 8c3953d6936319a1fafeb98f5a459123aa19535a..4aee3f4398095cd4aafa33447093db5362b36cf5 100644
--- a/paddlespeech/s2t/utils/cli_utils.py
+++ b/paddlespeech/s2t/utils/cli_utils.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import sys
 from collections.abc import Sequence
 from distutils.util import strtobool as dist_strtobool
diff --git a/paddlespeech/s2t/utils/cli_writers.py b/paddlespeech/s2t/utils/cli_writers.py
index 4fa7824e7617f93d6aee52d629644f8e0e14b49b..d3a4c2b85ccf7583c1e9cfd62d841c7f660c6a09 100644
--- a/paddlespeech/s2t/utils/cli_writers.py
+++ b/paddlespeech/s2t/utils/cli_writers.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 from pathlib import Path
 from typing import Dict
 
diff --git a/paddlespeech/s2t/utils/ctc_utils.py b/paddlespeech/s2t/utils/ctc_utils.py
index 5e5714469162af18245fcea7f43259a1caa6ce9d..e005e5d2854c3698f9f6fdc10f986fdc389464a3 100644
--- a/paddlespeech/s2t/utils/ctc_utils.py
+++ b/paddlespeech/s2t/utils/ctc_utils.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference wenet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from wenet(https://github.com/wenet-e2e/wenet)
 from typing import List
 
 import numpy as np
diff --git a/paddlespeech/s2t/utils/dynamic_import.py b/paddlespeech/s2t/utils/dynamic_import.py
index 9b415bb7ff20a35cf15005319b6dc92c18464a1d..50bd73a6de4219fd10c1679856eda918ac012eac 100644
--- a/paddlespeech/s2t/utils/dynamic_import.py
+++ b/paddlespeech/s2t/utils/dynamic_import.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference espnet Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+# Modified from espnet(https://github.com/espnet/espnet)
 import importlib
 import inspect
 from typing import Any
diff --git a/paddlespeech/t2s/training/extension.py b/paddlespeech/t2s/training/extension.py
index cc59e92226e2817e7f0f303afe2e19a792518e1b..3f755a76a5e3ef89a41f14b6631eb5f1d345ad4c 100644
--- a/paddlespeech/t2s/training/extension.py
+++ b/paddlespeech/t2s/training/extension.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 from typing import Callable
 
 PRIORITY_WRITER = 300
diff --git a/paddlespeech/t2s/training/extensions/evaluator.py b/paddlespeech/t2s/training/extensions/evaluator.py
index 3d17f70cd65ed3bd209387e81f3f65775fb86007..3940dffe17c6312ff9fee0552a6df4e9903ee7fa 100644
--- a/paddlespeech/t2s/training/extensions/evaluator.py
+++ b/paddlespeech/t2s/training/extensions/evaluator.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 from typing import Dict
 
 import paddle
diff --git a/paddlespeech/t2s/training/extensions/snapshot.py b/paddlespeech/t2s/training/extensions/snapshot.py
index f9b672687517d99bc3b4e188f9ebb9a4658bcfec..3a86556b6dce41a91398d90902ce49c29e78c010 100644
--- a/paddlespeech/t2s/training/extensions/snapshot.py
+++ b/paddlespeech/t2s/training/extensions/snapshot.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import logging
 import os
 from datetime import datetime
diff --git a/paddlespeech/t2s/training/reporter.py b/paddlespeech/t2s/training/reporter.py
index 93c1e1776202d4be61fc249b17d61fc4d0558175..a61506daf04c3b74b02cf4805b6720fdfbd41dc3 100644
--- a/paddlespeech/t2s/training/reporter.py
+++ b/paddlespeech/t2s/training/reporter.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import contextlib
 import math
 from collections import defaultdict
diff --git a/paddlespeech/t2s/training/updater.py b/paddlespeech/t2s/training/updater.py
index a7ea9c2d386d338f8392f78a309233a16e781bc2..a70550317e1ae6e0014db1a849ce3139eb19c542 100644
--- a/paddlespeech/t2s/training/updater.py
+++ b/paddlespeech/t2s/training/updater.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import logging
 from dataclasses import dataclass
 
diff --git a/paddlespeech/t2s/training/updaters/standard_updater.py b/paddlespeech/t2s/training/updaters/standard_updater.py
index ecbe0e6a8a89db86da4a0031894a1a426cbe3c76..b1c48620ee64b3879e8d3175ca3507b656b79a5f 100644
--- a/paddlespeech/t2s/training/updaters/standard_updater.py
+++ b/paddlespeech/t2s/training/updaters/standard_updater.py
@@ -11,7 +11,7 @@
 # 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.
-# Reference chainer MIT (https://opensource.org/licenses/MIT)
+# Modified from chainer(https://github.com/chainer/chainer)
 import logging
 import time
 from typing import Dict