diff --git a/paddlespeech/t2s/data/batch.py b/paddlespeech/t2s/data/batch.py
index 5e7ac3996ccf94d6ba6f57b0b8cd91f8025ec883..9d83bbe09c60d25d15ba0fcfd7197d257d4993cf 100644
--- a/paddlespeech/t2s/data/batch.py
+++ b/paddlespeech/t2s/data/batch.py
@@ -52,9 +52,8 @@ def batch_text_id(minibatch, pad_id=0, dtype=np.int64):
     """
     peek_example = minibatch[0]
     assert len(peek_example.shape) == 1, "text example is an 1D tensor"
-
-    lengths = [example.shape[0] for example in
-               minibatch]  # assume (channel, n_samples) or (n_samples, )
+    # assume (channel, n_samples) or (n_samples, )
+    lengths = [example.shape[0] for example in minibatch]
     max_len = np.max(lengths)
 
     batch = []
diff --git a/paddlespeech/t2s/data/get_feats.py b/paddlespeech/t2s/data/get_feats.py
index d7ab764020933f352c2d4bbf54395387c272a856..b4bea0bd090e947661ee3e6be766839f164ec6a1 100644
--- a/paddlespeech/t2s/data/get_feats.py
+++ b/paddlespeech/t2s/data/get_feats.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 import librosa
 import numpy as np
 import pyworld
diff --git a/paddlespeech/t2s/models/fastspeech2/fastspeech2.py b/paddlespeech/t2s/models/fastspeech2/fastspeech2.py
index 754fef2a3ce49165ceba876dcd94353a4f0d0626..5942533a93a3875bbe4db612d938e25157037562 100644
--- a/paddlespeech/t2s/models/fastspeech2/fastspeech2.py
+++ b/paddlespeech/t2s/models/fastspeech2/fastspeech2.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Fastspeech2 related modules for paddle"""
 from typing import Dict
 from typing import Sequence
diff --git a/paddlespeech/t2s/models/melgan/melgan.py b/paddlespeech/t2s/models/melgan/melgan.py
index 94d6e631b9283b075167e216469b259b490b8acd..80bb1c1b2c4e17fbcf0ff531e9504ff6ccad2332 100644
--- a/paddlespeech/t2s/models/melgan/melgan.py
+++ b/paddlespeech/t2s/models/melgan/melgan.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """MelGAN Modules."""
 from typing import Any
 from typing import Dict
diff --git a/paddlespeech/t2s/models/parallel_wavegan/parallel_wavegan.py b/paddlespeech/t2s/models/parallel_wavegan/parallel_wavegan.py
index fe4ec355139d7048e6336f8678e751d489269b67..9b0ba47498f996ce04c4d8e20838b5f39a2563cc 100644
--- a/paddlespeech/t2s/models/parallel_wavegan/parallel_wavegan.py
+++ b/paddlespeech/t2s/models/parallel_wavegan/parallel_wavegan.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 import math
 from typing import Any
 from typing import Dict
diff --git a/paddlespeech/t2s/models/transformer_tts/transformer_tts.py b/paddlespeech/t2s/models/transformer_tts/transformer_tts.py
index f8feb553a1137092edab285f3b1bf2a2f8cd7db4..97233c766eb0d71ad51a17d7d33c87a8bc2f4da3 100644
--- a/paddlespeech/t2s/models/transformer_tts/transformer_tts.py
+++ b/paddlespeech/t2s/models/transformer_tts/transformer_tts.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Fastspeech2 related modules for paddle"""
 from typing import Dict
 from typing import Sequence
diff --git a/paddlespeech/t2s/modules/adversarial_loss.py b/paddlespeech/t2s/modules/adversarial_loss.py
index 02e8c807dcecf13a417bb4a7a33d5ec3037c52fe..d2c8f7a94ea89d5fe5975799e3cacad4f94b4cd0 100644
--- a/paddlespeech/t2s/modules/adversarial_loss.py
+++ b/paddlespeech/t2s/modules/adversarial_loss.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Adversarial loss modules."""
 import paddle
 import paddle.nn.functional as F
diff --git a/paddlespeech/t2s/modules/fastspeech2_predictor/duration_predictor.py b/paddlespeech/t2s/modules/fastspeech2_predictor/duration_predictor.py
index eac7cf99e5fc1c152563032016edc504c2bc99e8..b269b6866452f57296656f30e0b74f472737891c 100644
--- a/paddlespeech/t2s/modules/fastspeech2_predictor/duration_predictor.py
+++ b/paddlespeech/t2s/modules/fastspeech2_predictor/duration_predictor.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Duration predictor related modules."""
 import paddle
 from paddle import nn
diff --git a/paddlespeech/t2s/modules/fastspeech2_predictor/length_regulator.py b/paddlespeech/t2s/modules/fastspeech2_predictor/length_regulator.py
index a4d508add1aa1661fb127ee16806e3ca108e2736..bf595b24e89b713b19cc52e300c22ccd4363e469 100644
--- a/paddlespeech/t2s/modules/fastspeech2_predictor/length_regulator.py
+++ b/paddlespeech/t2s/modules/fastspeech2_predictor/length_regulator.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Length regulator related modules."""
 import paddle
 from paddle import nn
diff --git a/paddlespeech/t2s/modules/fastspeech2_predictor/variance_predictor.py b/paddlespeech/t2s/modules/fastspeech2_predictor/variance_predictor.py
index 0fd108d323b75e21d3132d6164b709a8514156aa..417fca82594afaa7a6c2d6400c3894c409511681 100644
--- a/paddlespeech/t2s/modules/fastspeech2_predictor/variance_predictor.py
+++ b/paddlespeech/t2s/modules/fastspeech2_predictor/variance_predictor.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Variance predictor related modules."""
 import paddle
 from paddle import nn
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/attention.py b/paddlespeech/t2s/modules/fastspeech2_transformer/attention.py
index a61f1245d34c75d7fd66bc7a6a111d9d8ef858a3..b11329b03144f3997f36ab1914cbec1612faf41b 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/attention.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/attention.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Multi-Head Attention layer definition."""
 import math
 
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/decoder.py b/paddlespeech/t2s/modules/fastspeech2_transformer/decoder.py
index c41e39955700d2ff63431b3104699167857bc8f6..489fda12bc9d5708418ef2b8e3b96ea264f7101e 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/decoder.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/decoder.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 # 暂时删除了 dyminic conv
 """Decoder definition."""
 import logging
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/decoder_layer.py b/paddlespeech/t2s/modules/fastspeech2_transformer/decoder_layer.py
index 9b042483b058f495f1cc1117bfbb53205e7171e2..0310d83ea3933c185612d53db316457f24fb8020 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/decoder_layer.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/decoder_layer.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Decoder self-attention layer definition."""
 import paddle
 from paddle import nn
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/embedding.py b/paddlespeech/t2s/modules/fastspeech2_transformer/embedding.py
index 1dfd6dfdc000ed899d448a4fb17a6fd3686e013d..f26c9dcbab659f3e3b73c61308d3f513c4f26739 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/embedding.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/embedding.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Positional Encoding Module."""
 import math
 
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/encoder.py b/paddlespeech/t2s/modules/fastspeech2_transformer/encoder.py
index 904b9d8b1f3a3770035cc6df76dca73ab56063e8..62d7a96f98738266b84aaebeb5fd0306c5a07add 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/encoder.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/encoder.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 import logging
 
 from paddle import nn
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/encoder_layer.py b/paddlespeech/t2s/modules/fastspeech2_transformer/encoder_layer.py
index d8f89d677adeec69c58c24b324619335f07997fc..fb2c2e823a327ab0a531076df00d19f4ae9faa7b 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/encoder_layer.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/encoder_layer.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Encoder self-attention layer definition."""
 import paddle
 from paddle import nn
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/lightconv.py b/paddlespeech/t2s/modules/fastspeech2_transformer/lightconv.py
index 3aceed318c52a9488b3d3eabc2063f0162287879..1aeb6d6e19a8f7b0e0820829a3ed7f496693fd28 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/lightconv.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/lightconv.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Lightweight Convolution Module."""
 import numpy
 import paddle
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/positionwise_feed_forward.py b/paddlespeech/t2s/modules/fastspeech2_transformer/positionwise_feed_forward.py
index 39c06ebaa1268e6c1c85008287fafdd31034a347..297a3b4fbb78bc121e7102f85a95272d4f91c8ef 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/positionwise_feed_forward.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/positionwise_feed_forward.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Positionwise feed forward layer definition."""
 import paddle
 
diff --git a/paddlespeech/t2s/modules/fastspeech2_transformer/repeat.py b/paddlespeech/t2s/modules/fastspeech2_transformer/repeat.py
index 3c62298e39010585624c1f4605a9376d5c9258fb..0325a638235a8fb736da886e24225ed2f66e876a 100644
--- a/paddlespeech/t2s/modules/fastspeech2_transformer/repeat.py
+++ b/paddlespeech/t2s/modules/fastspeech2_transformer/repeat.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Repeat the same layer definition."""
 import paddle
 
diff --git a/paddlespeech/t2s/modules/nets_utils.py b/paddlespeech/t2s/modules/nets_utils.py
index 0696335a5c5a4a9ae424a2c6e8f72ef480b5eaa5..30d3db86c885a56204562b82f7e0d709a96717e2 100644
--- a/paddlespeech/t2s/modules/nets_utils.py
+++ b/paddlespeech/t2s/modules/nets_utils.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 import paddle
 from paddle import nn
 from typeguard import check_argument_types
diff --git a/paddlespeech/t2s/modules/pqmf.py b/paddlespeech/t2s/modules/pqmf.py
index 70210e3ba843ebd9ed2a35ea94e18629c7061ace..c299fb5772070fa2e5a4fdc5201541b787b7d449 100644
--- a/paddlespeech/t2s/modules/pqmf.py
+++ b/paddlespeech/t2s/modules/pqmf.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Pseudo QMF modules."""
 import numpy as np
 import paddle
diff --git a/paddlespeech/t2s/modules/residual_stack.py b/paddlespeech/t2s/modules/residual_stack.py
index 71bd4f0c557313b81bdec069b7fc4be3fe5ad113..236f41d3ed541ef28a6c0838b0e9aecebf98f0a2 100644
--- a/paddlespeech/t2s/modules/residual_stack.py
+++ b/paddlespeech/t2s/modules/residual_stack.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Residual stack module in MelGAN."""
 from typing import Any
 from typing import Dict
diff --git a/paddlespeech/t2s/modules/stft_loss.py b/paddlespeech/t2s/modules/stft_loss.py
index 8af55ab1439a61b4ef60b5ede567ef6bc1304c23..31963e718de6b617d1067458ee00987ebbe5a1ad 100644
--- a/paddlespeech/t2s/modules/stft_loss.py
+++ b/paddlespeech/t2s/modules/stft_loss.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 import paddle
 from paddle import nn
 from paddle.nn import functional as F
diff --git a/paddlespeech/t2s/modules/style_encoder.py b/paddlespeech/t2s/modules/style_encoder.py
index c6b12d445af96436dbb404ef279a0751bc0dfe84..868a73a969edb6d3dc1affe6b0e401a88fb7d11b 100644
--- a/paddlespeech/t2s/modules/style_encoder.py
+++ b/paddlespeech/t2s/modules/style_encoder.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Style encoder of GST-Tacotron."""
 from typing import Sequence
 
diff --git a/paddlespeech/t2s/modules/tacotron2/decoder.py b/paddlespeech/t2s/modules/tacotron2/decoder.py
index 779fd0c62f87eb68c032abd5e19b88691f21054a..691bb3ee29c31397400e9ea6b77d982a1b2f0f64 100644
--- a/paddlespeech/t2s/modules/tacotron2/decoder.py
+++ b/paddlespeech/t2s/modules/tacotron2/decoder.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Tacotron2 decoder related modules."""
 import paddle.nn.functional as F
 import six
diff --git a/paddlespeech/t2s/modules/tacotron2/encoder.py b/paddlespeech/t2s/modules/tacotron2/encoder.py
index 95f71d5e3f4a13da6ff4babd1962ddda6fea643d..b95e3529ff7eda456863b519e8982580c066cc01 100644
--- a/paddlespeech/t2s/modules/tacotron2/encoder.py
+++ b/paddlespeech/t2s/modules/tacotron2/encoder.py
@@ -11,6 +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.
+# Modified from espnet(https://github.com/espnet/espnet)
 """Tacotron2 encoder related modules."""
 import paddle
 import six