diff --git a/paddlespeech/__init__.py b/paddlespeech/__init__.py
index 4b1c0ef3dea750c0503909dd168624ca845baafb..b781c4a8e5cc99590e179faf1c4c3989349d4216 100644
--- a/paddlespeech/__init__.py
+++ b/paddlespeech/__init__.py
@@ -14,5 +14,3 @@
 import _locale
 
 _locale._getdefaultlocale = (lambda *args: ['en_US', 'utf8'])
-
-
diff --git a/speechx/examples/ds2_ol/decoder/ctc-prefix-beam-search-decoder-ol.cc b/speechx/examples/ds2_ol/decoder/ctc-prefix-beam-search-decoder-ol.cc
index a04b1c86cec92432b5d4b739cbe0ce548781775a..46a78ef99b6c7defc131b0e489629748b109b37f 100644
--- a/speechx/examples/ds2_ol/decoder/ctc-prefix-beam-search-decoder-ol.cc
+++ b/speechx/examples/ds2_ol/decoder/ctc-prefix-beam-search-decoder-ol.cc
@@ -41,7 +41,9 @@ DEFINE_string(
 DEFINE_string(model_output_names,
               "softmax_0.tmp_0,tmp_5,concat_0.tmp_0,concat_1.tmp_0",
               "model output names");
-DEFINE_string(model_cache_names, "chunk_state_h_box,chunk_state_c_box", "model cache names");
+DEFINE_string(model_cache_names,
+              "chunk_state_h_box,chunk_state_c_box",
+              "model cache names");
 DEFINE_string(model_cache_shapes, "5-1-1024,5-1-1024", "model cache shapes");
 
 using kaldi::BaseFloat;
diff --git a/speechx/examples/ds2_ol/decoder/wfst-decoder-ol.cc b/speechx/examples/ds2_ol/decoder/wfst-decoder-ol.cc
index bbb27b39159d8ad4a920445735403fcd4ac00f5c..cb68a5a2c804c14e4329a6172cacae8384cc8b82 100644
--- a/speechx/examples/ds2_ol/decoder/wfst-decoder-ol.cc
+++ b/speechx/examples/ds2_ol/decoder/wfst-decoder-ol.cc
@@ -44,7 +44,9 @@ DEFINE_string(
 DEFINE_string(model_output_names,
               "softmax_0.tmp_0,tmp_5,concat_0.tmp_0,concat_1.tmp_0",
               "model output names");
-DEFINE_string(model_cache_names, "chunk_state_h_box,chunk_state_c_box", "model cache names");
+DEFINE_string(model_cache_names,
+              "chunk_state_h_box,chunk_state_c_box",
+              "model cache names");
 DEFINE_string(model_cache_shapes, "5-1-1024,5-1-1024", "model cache shapes");
 
 using kaldi::BaseFloat;
diff --git a/speechx/examples/ds2_ol/feat/linear-spectrogram-wo-db-norm-ol.cc b/speechx/examples/ds2_ol/feat/linear-spectrogram-wo-db-norm-ol.cc
index 0b066d6a51defc1c3a3f1bde8a21532ef51d4d4d..c3652ad4adab8205cd960d31580ca209f5dcd354 100644
--- a/speechx/examples/ds2_ol/feat/linear-spectrogram-wo-db-norm-ol.cc
+++ b/speechx/examples/ds2_ol/feat/linear-spectrogram-wo-db-norm-ol.cc
@@ -42,7 +42,7 @@ int main(int argc, char* argv[]) {
 
     int32 num_done = 0, num_err = 0;
 
-    // feature pipeline: wave cache --> hanning window 
+    // feature pipeline: wave cache --> hanning window
     // -->linear_spectrogram --> global cmvn -> feat cache
 
     std::unique_ptr<ppspeech::FrontendInterface> data_source(
diff --git a/speechx/speechx/decoder/param.h b/speechx/speechx/decoder/param.h
index cd68e5e9ab643e8b8ae9c25cf2d940f58bb442a3..ef56562121126d061a664f57da3b473042e31693 100644
--- a/speechx/speechx/decoder/param.h
+++ b/speechx/speechx/decoder/param.h
@@ -43,7 +43,9 @@ DEFINE_string(
 DEFINE_string(model_output_names,
               "softmax_0.tmp_0,tmp_5,concat_0.tmp_0,concat_1.tmp_0",
               "model output names");
-DEFINE_string(model_cache_names, "chunk_state_h_box,chunk_state_c_box", "model cache names");
+DEFINE_string(model_cache_names,
+              "chunk_state_h_box,chunk_state_c_box",
+              "model cache names");
 DEFINE_string(model_cache_shapes, "5-1-1024,5-1-1024", "model cache shapes");
 
 
diff --git a/speechx/speechx/frontend/audio/audio_cache.h b/speechx/speechx/frontend/audio/audio_cache.h
index c44dedddab3a3cc99875f3357038d306bae4ba15..4ebcd9474d1fe70398d5888589ba4223e9a63326 100644
--- a/speechx/speechx/frontend/audio/audio_cache.h
+++ b/speechx/speechx/frontend/audio/audio_cache.h
@@ -58,7 +58,7 @@ class AudioCache : public FrontendInterface {
     std::mutex mutex_;
     std::condition_variable ready_feed_condition_;
     kaldi::int32 timeout_;  // millisecond
-    bool to_float32_; // int16 -> float32. used in linear_spectrogram
+    bool to_float32_;       // int16 -> float32. used in linear_spectrogram
 
     DISALLOW_COPY_AND_ASSIGN(AudioCache);
 };
diff --git a/speechx/speechx/frontend/audio/mfcc.cc b/speechx/speechx/frontend/audio/mfcc.cc
index 115d3367e887607ca9f041becd369cb9430a253e..bda1f96d71d587e46579c5cadc73ead3433eb9b5 100644
--- a/speechx/speechx/frontend/audio/mfcc.cc
+++ b/speechx/speechx/frontend/audio/mfcc.cc
@@ -30,7 +30,7 @@ using kaldi::Matrix;
 using std::vector;
 
 Mfcc::Mfcc(const MfccOptions& opts,
-             std::unique_ptr<FrontendInterface> base_extractor)
+           std::unique_ptr<FrontendInterface> base_extractor)
     : opts_(opts),
       computer_(opts.mfcc_opts),
       window_function_(computer_.GetFrameOptions()) {
diff --git a/speechx/speechx/nnet/paddle_nnet.cc b/speechx/speechx/nnet/paddle_nnet.cc
index 6cf6aa5e3dc21edf421f57a496c6119f599e1dea..881a82f51774763dc8cd02e5f7b79316d988a652 100644
--- a/speechx/speechx/nnet/paddle_nnet.cc
+++ b/speechx/speechx/nnet/paddle_nnet.cc
@@ -206,7 +206,7 @@ void PaddleNnet::FeedForward(const Vector<BaseFloat>& features,
     inferences->Resize(row * col);
     *inference_dim = col;
     output_tensor->CopyToCpu(inferences->Data());
-    
+
     ReleasePredictor(predictor);
 }
 
diff --git a/speechx/speechx/nnet/paddle_nnet.h b/speechx/speechx/nnet/paddle_nnet.h
index fdd51048cee675e3239179c14b2fae8427302de1..e2b3d5bc495ca1f15ab012de895b26486c2f2693 100644
--- a/speechx/speechx/nnet/paddle_nnet.h
+++ b/speechx/speechx/nnet/paddle_nnet.h
@@ -24,7 +24,7 @@ namespace ppspeech {
 struct ModelOptions {
     std::string model_path;
     std::string param_path;
-    int thread_num; // predictor thread pool size
+    int thread_num;  // predictor thread pool size
     bool use_gpu;
     bool switch_ir_optim;
     std::string input_names;