diff --git a/speechx/examples/feat/linear_spectrogram_main.cc b/speechx/examples/feat/linear_spectrogram_main.cc
index 8f32bac2..ca76d85c 100644
--- a/speechx/examples/feat/linear_spectrogram_main.cc
+++ b/speechx/examples/feat/linear_spectrogram_main.cc
@@ -20,11 +20,11 @@
 #include "kaldi/util/kaldi-io.h"
 #include "kaldi/util/table-types.h"
 
-#include "frontend/audio/linear_spectrogram.h"
 #include "frontend/audio/audio_cache.h"
 #include "frontend/audio/data_cache.h"
 #include "frontend/audio/feature_cache.h"
 #include "frontend/audio/frontend_itf.h"
+#include "frontend/audio/linear_spectrogram.h"
 #include "frontend/audio/normalizer.h"
 
 DEFINE_string(wav_rspecifier, "", "test wav scp path");
@@ -187,9 +187,8 @@ int main(int argc, char* argv[]) {
     std::unique_ptr<ppspeech::FrontendInterface> linear_spectrogram(
         new ppspeech::LinearSpectrogram(opt, std::move(db_norm)));
 
-    std::unique_ptr<ppspeech::FrontendInterface> cmvn(
-        new ppspeech::CMVN(FLAGS_cmvn_write_path,
-                           std::move(linear_spectrogram)));
+    std::unique_ptr<ppspeech::FrontendInterface> cmvn(new ppspeech::CMVN(
+        FLAGS_cmvn_write_path, std::move(linear_spectrogram)));
 
     ppspeech::FeatureCache feature_cache(kint16max, std::move(cmvn));
     LOG(INFO) << "feat dim: " << feature_cache.Dim();
diff --git a/speechx/speechx/frontend/audio/cmvn.cc b/speechx/speechx/frontend/audio/cmvn.cc
index 706492b7..4c1ffd6a 100644
--- a/speechx/speechx/frontend/audio/cmvn.cc
+++ b/speechx/speechx/frontend/audio/cmvn.cc
@@ -1,3 +1,17 @@
+// 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.
+
 
 #include "frontend/audio/cmvn.h"
 #include "kaldi/feat/cmvn.h"
@@ -13,8 +27,7 @@ using kaldi::SubVector;
 using std::unique_ptr;
 
 
-CMVN::CMVN(std::string cmvn_file,
-           unique_ptr<FrontendInterface> base_extractor)
+CMVN::CMVN(std::string cmvn_file, unique_ptr<FrontendInterface> base_extractor)
     : var_norm_(true) {
     base_extractor_ = std::move(base_extractor);
     bool binary;
diff --git a/speechx/speechx/frontend/audio/cmvn.h b/speechx/speechx/frontend/audio/cmvn.h
index b3cfbb11..50ef5649 100644
--- a/speechx/speechx/frontend/audio/cmvn.h
+++ b/speechx/speechx/frontend/audio/cmvn.h
@@ -1,3 +1,17 @@
+// 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.
+
 #pragma once
 
 #include "base/common.h"
diff --git a/speechx/speechx/frontend/audio/feature_cache.cc b/speechx/speechx/frontend/audio/feature_cache.cc
index d7bea61a..3f7f6502 100644
--- a/speechx/speechx/frontend/audio/feature_cache.cc
+++ b/speechx/speechx/frontend/audio/feature_cache.cc
@@ -23,8 +23,8 @@ using std::vector;
 using kaldi::SubVector;
 using std::unique_ptr;
 
-FeatureCache::FeatureCache(
-    int max_size, unique_ptr<FrontendInterface> base_extractor) {
+FeatureCache::FeatureCache(int max_size,
+                           unique_ptr<FrontendInterface> base_extractor) {
     max_size_ = max_size;
     base_extractor_ = std::move(base_extractor);
 }
diff --git a/speechx/speechx/frontend/audio/normalizer.h b/speechx/speechx/frontend/audio/normalizer.h
index df9e4b75..dcf721dd 100644
--- a/speechx/speechx/frontend/audio/normalizer.h
+++ b/speechx/speechx/frontend/audio/normalizer.h
@@ -1,3 +1,17 @@
+// 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.
+
 #pragma once
 
 #include "frontend/audio/cmvn.h"
diff --git a/speechx/speechx/nnet/decodable.h b/speechx/speechx/nnet/decodable.h
index c75a0f4d..3f0aab04 100644
--- a/speechx/speechx/nnet/decodable.h
+++ b/speechx/speechx/nnet/decodable.h
@@ -24,9 +24,8 @@ struct DecodableOpts;
 
 class Decodable : public kaldi::DecodableInterface {
   public:
-    explicit Decodable(
-        const std::shared_ptr<NnetInterface>& nnet,
-        const std::shared_ptr<FrontendInterface>& frontend);
+    explicit Decodable(const std::shared_ptr<NnetInterface>& nnet,
+                       const std::shared_ptr<FrontendInterface>& frontend);
     // void Init(DecodableOpts config);
     virtual kaldi::BaseFloat LogLikelihood(int32 frame, int32 index);
     virtual bool IsLastFrame(int32 frame) const;