diff --git a/examples/fastspeech/synthesis.sh b/examples/fastspeech/synthesis.sh
index 32562d7..4daef57 100644
--- a/examples/fastspeech/synthesis.sh
+++ b/examples/fastspeech/synthesis.sh
@@ -6,6 +6,7 @@ python -u synthesis.py \
 --checkpoint_path='checkpoint/' \
 --fastspeech_step=71000 \
 --log_dir='./log' \
+--config_path='configs/synthesis.yaml' \
 
 if [ $? -ne 0 ]; then
     echo "Failed in synthesis!"
diff --git a/examples/fastspeech/train.sh b/examples/fastspeech/train.sh
index 11e78c4..2301ab3 100644
--- a/examples/fastspeech/train.sh
+++ b/examples/fastspeech/train.sh
@@ -13,7 +13,7 @@ python -u train.py \
 --transformer_step=160000 \
 --save_path='./checkpoint' \
 --log_dir='./log' \
---config_path='config/fastspeech.yaml' \
+--config_path='configs/fastspeech.yaml' \
 #--checkpoint_path='./checkpoint' \
 #--fastspeech_step=97000 \
 
diff --git a/examples/transformer_tts/synthesis.py b/examples/transformer_tts/synthesis.py
index 2896634..0f7b83d 100644
--- a/examples/transformer_tts/synthesis.py
+++ b/examples/transformer_tts/synthesis.py
@@ -84,7 +84,7 @@ def synthesis(text_input, args):
             dec_slf_mask = get_triu_tensor(
                 mel_input.numpy(), mel_input.numpy()).astype(np.float32)
             dec_slf_mask = fluid.layers.cast(
-                dg.to_variable(dec_slf_mask == 0), np.float32)
+                dg.to_variable(dec_slf_mask != 0), np.float32) * (-2**32 + 1)
             pos_mel = np.arange(1, mel_input.shape[1] + 1)
             pos_mel = fluid.layers.unsqueeze(dg.to_variable(pos_mel), [0])
             mel_pred, postnet_pred, attn_probs, stop_preds, attn_enc, attn_dec = model(
@@ -157,6 +157,5 @@ if __name__ == '__main__':
     parser = argparse.ArgumentParser(description="Synthesis model")
     add_config_options_to_parser(parser)
     args = parser.parse_args()
-    synthesis(
-        "They emphasized the necessity that the information now being furnished be handled with judgment and care.",
-        args)
+    synthesis("Parakeet stands for Paddle PARAllel text-to-speech toolkit.",
+              args)
diff --git a/examples/transformer_tts/synthesis.sh b/examples/transformer_tts/synthesis.sh
index 42b704d..65dff46 100644
--- a/examples/transformer_tts/synthesis.sh
+++ b/examples/transformer_tts/synthesis.sh
@@ -2,14 +2,14 @@
 # train model
 CUDA_VISIBLE_DEVICES=0 \
 python -u synthesis.py \
---max_len=600 \
---transformer_step=160000 \
---vocoder_step=90000 \
+--max_len=300 \
+--transformer_step=120000 \
+--vocoder_step=100000 \
 --use_gpu=1 \
 --checkpoint_path='./checkpoint' \
 --log_dir='./log' \
 --sample_path='./sample' \
---config_path='config/synthesis.yaml' \
+--config_path='configs/synthesis.yaml' \
 
 if [ $? -ne 0 ]; then
     echo "Failed in training!"
diff --git a/examples/transformer_tts/train_transformer.sh b/examples/transformer_tts/train_transformer.sh
index 346d351..f5e47ee 100644
--- a/examples/transformer_tts/train_transformer.sh
+++ b/examples/transformer_tts/train_transformer.sh
@@ -14,7 +14,7 @@ python -u train_transformer.py \
 --data_path='../../dataset/LJSpeech-1.1' \
 --save_path='./checkpoint' \
 --log_dir='./log' \
---config_path='config/train_transformer.yaml' \
+--config_path='configs/train_transformer.yaml' \
 #--checkpoint_path='./checkpoint' \
 #--transformer_step=160000 \
 
diff --git a/examples/transformer_tts/train_vocoder.sh b/examples/transformer_tts/train_vocoder.sh
index e453c83..ea57ebd 100644
--- a/examples/transformer_tts/train_vocoder.sh
+++ b/examples/transformer_tts/train_vocoder.sh
@@ -12,7 +12,7 @@ python -u train_vocoder.py \
 --data_path='../../dataset/LJSpeech-1.1' \
 --save_path='./checkpoint' \
 --log_dir='./log' \
---config_path='config/train_vocoder.yaml' \
+--config_path='configs/train_vocoder.yaml' \
 #--checkpoint_path='./checkpoint' \
 #--vocoder_step=27000 \
 
diff --git a/parakeet/models/fastspeech/decoder.py b/parakeet/models/fastspeech/decoder.py
index 8432fc5..96fefc1 100644
--- a/parakeet/models/fastspeech/decoder.py
+++ b/parakeet/models/fastspeech/decoder.py
@@ -59,15 +59,25 @@ class Decoder(dg.Layer):
     def forward(self, enc_seq, enc_pos, non_pad_mask, slf_attn_mask=None):
         """
         Decoder layer of FastSpeech.
-        
         Args:
-            enc_seq (Variable), Shape(B, text_T, C), dtype: float32. 
-                The output of length regulator.
-            enc_pos (Variable, optional): Shape(B, T_mel),
-                dtype: int64. The spectrum position. T_mel means the timesteps of input spectrum.
+            enc_seq (Variable): The output of length regulator.
+                Shape: (B, T_text, C), T_text means the timesteps of input text, 
+                dtype: float32. 
+            enc_pos (Variable): The spectrum position. 
+                Shape: (B, T_mel), T_mel means the timesteps of input spectrum, 
+                dtype: int64.
+            non_pad_mask (Variable): the mask with non pad.
+                Shape: (B, T_mel, 1),
+                dtype: int64.
+            slf_attn_mask (Variable, optional): the mask of mel spectrum. Defaults to None.
+                Shape: (B, T_mel, T_mel),
+                dtype: int64.
+
         Returns:
-            dec_output (Variable), Shape(B, mel_T, C), the decoder output.
-            dec_slf_attn_list (Variable), Shape(B, mel_T, mel_T), the decoder self attention list.
+            dec_output (Variable): the decoder output.
+                Shape: (B, T_mel, C).
+            dec_slf_attn_list (list[Variable]): the decoder self attention list.
+                Len: n_layers.
         """
         dec_slf_attn_list = []
         slf_attn_mask = layers.expand(slf_attn_mask, [self.n_head, 1, 1])
diff --git a/parakeet/models/fastspeech/encoder.py b/parakeet/models/fastspeech/encoder.py
index 15d634e..0a39ded 100644
--- a/parakeet/models/fastspeech/encoder.py
+++ b/parakeet/models/fastspeech/encoder.py
@@ -64,17 +64,24 @@ class Encoder(dg.Layer):
     def forward(self, character, text_pos, non_pad_mask, slf_attn_mask=None):
         """
         Encoder layer of FastSpeech.
-        
         Args:
-            character (Variable): Shape(B, T_text), dtype: float32. The input text
-                characters. T_text means the timesteps of input characters.
-            text_pos (Variable): Shape(B, T_text), dtype: int64. The input text
-                position. T_text means the timesteps of input characters.
-
+            character (Variable): The input text characters. 
+                Shape: (B, T_text), T_text means the timesteps of input characters,
+                dtype: float32.
+            text_pos (Variable): The input text position. 
+                Shape: (B, T_text), dtype: int64.
+            non_pad_mask (Variable): the mask with non pad.
+                Shape: (B, T_text, 1),
+                dtype: int64.
+            slf_attn_mask (Variable, optional): the mask of input characters. Defaults to None.
+                Shape: (B, T_text, T_text),
+                dtype: int64.
+                
         Returns:
-            enc_output (Variable), Shape(B, text_T, C), the encoder output.
-            non_pad_mask (Variable), Shape(B, T_text, 1), the mask with non pad.
-            enc_slf_attn_list (list<Variable>), Len(n_layers), Shape(B * n_head, text_T, text_T), the encoder self attention list.
+            enc_output (Variable), the encoder output. Shape(B, T_text, C)
+            non_pad_mask (Variable), the mask with non pad. Shape(B, T_text, 1)
+            enc_slf_attn_list (list[Variable]), the encoder self attention list.
+                Len: n_layers.
         """
         enc_slf_attn_list = []
         slf_attn_mask = layers.expand(slf_attn_mask, [self.n_head, 1, 1])
diff --git a/parakeet/models/fastspeech/fastspeech.py b/parakeet/models/fastspeech/fastspeech.py
index a37d5fa..75f5db9 100644
--- a/parakeet/models/fastspeech/fastspeech.py
+++ b/parakeet/models/fastspeech/fastspeech.py
@@ -82,34 +82,45 @@ class FastSpeech(dg.Layer):
                 text_pos,
                 enc_non_pad_mask,
                 dec_non_pad_mask,
+                mel_pos=None,
                 enc_slf_attn_mask=None,
                 dec_slf_attn_mask=None,
-                mel_pos=None,
                 length_target=None,
                 alpha=1.0):
         """
         FastSpeech model.
         
         Args:
-            character (Variable): Shape(B, T_text), dtype: float32. The input text
-                characters. T_text means the timesteps of input characters.
-            text_pos (Variable): Shape(B, T_text), dtype: int64. The input text
-                position. T_text means the timesteps of input characters.
-            mel_pos (Variable, optional): Shape(B, T_mel),
-                dtype: int64. The spectrum position. T_mel means the timesteps of input spectrum.
-            length_target (Variable, optional): Shape(B, T_text),
-                dtype: int64. The duration of phoneme compute from pretrained transformerTTS.
-            alpha (Constant): 
-                dtype: float32. The hyperparameter to determine the length of the expanded sequence 
-                mel, thereby controlling the voice speed.
+            character (Variable): The input text characters. 
+                Shape: (B, T_text), T_text means the timesteps of input characters, dtype: float32.
+            text_pos (Variable): The input text position. 
+                Shape: (B, T_text), dtype: int64.
+            mel_pos (Variable, optional): The spectrum position. 
+                Shape: (B, T_mel), T_mel means the timesteps of input spectrum, dtype: int64. 
+            enc_non_pad_mask (Variable): the mask with non pad.
+                Shape: (B, T_text, 1),
+                dtype: int64.
+            dec_non_pad_mask (Variable): the mask with non pad.
+                Shape: (B, T_mel, 1),
+                dtype: int64.
+            enc_slf_attn_mask (Variable, optional): the mask of input characters. Defaults to None.
+                Shape: (B, T_text, T_text),
+                dtype: int64.
+            slf_attn_mask (Variable, optional): the mask of mel spectrum. Defaults to None.
+                Shape: (B, T_mel, T_mel),
+                dtype: int64.
+            length_target (Variable, optional): The duration of phoneme compute from pretrained transformerTTS.
+                Defaults to None. Shape: (B, T_text), dtype: int64. 
+            alpha (float32, optional): The hyperparameter to determine the length of the expanded sequence 
+                mel, thereby controlling the voice speed. Defaults to 1.0.
 
         Returns:
-            mel_output (Variable), Shape(B, mel_T, C), the mel output before postnet.
-            mel_output_postnet (Variable), Shape(B, mel_T, C), the mel output after postnet.
-            duration_predictor_output (Variable), Shape(B, text_T), the duration of phoneme compute 
-            with duration predictor.
-            enc_slf_attn_list (Variable), Shape(B, text_T, text_T), the encoder self attention list.
-            dec_slf_attn_list (Variable), Shape(B, mel_T, mel_T), the decoder self attention list.
+            mel_output (Variable), the mel output before postnet. Shape: (B, T_mel, C), 
+            mel_output_postnet (Variable), the mel output after postnet. Shape: (B, T_mel, C).
+            duration_predictor_output (Variable), the duration of phoneme compute with duration predictor. 
+                Shape: (B, T_text).
+            enc_slf_attn_list (List[Variable]), the encoder self attention list. Len: enc_n_layers.
+            dec_slf_attn_list (List[Variable]), the decoder self attention list. Len: dec_n_layers.
         """
 
         encoder_output, enc_slf_attn_list = self.encoder(
@@ -118,7 +129,6 @@ class FastSpeech(dg.Layer):
             enc_non_pad_mask,
             slf_attn_mask=enc_slf_attn_mask)
         if fluid.framework._dygraph_tracer()._train_mode:
-
             length_regulator_output, duration_predictor_output = self.length_regulator(
                 encoder_output, target=length_target, alpha=alpha)
             decoder_output, dec_slf_attn_list = self.decoder(
diff --git a/parakeet/models/fastspeech/fft_block.py b/parakeet/models/fastspeech/fft_block.py
index 0c0ed4f..d58f5b2 100644
--- a/parakeet/models/fastspeech/fft_block.py
+++ b/parakeet/models/fastspeech/fft_block.py
@@ -51,15 +51,17 @@ class FFTBlock(dg.Layer):
         Feed Forward Transformer block in FastSpeech.
         
         Args:
-            enc_input (Variable): Shape(B, T, C), dtype: float32. The embedding characters input. 
-                T means the timesteps of input.
-            non_pad_mask (Variable): Shape(B, T, 1), dtype: int64. The mask of sequence.
-            slf_attn_mask (Variable): Shape(B, len_q, len_k), dtype: int64. The mask of self attention. 
-                len_q means the sequence length of query, len_k means the sequence length of key.
-
+            enc_input (Variable): The embedding characters input. 
+                Shape: (B, T, C), T means the timesteps of input, dtype: float32.   
+            non_pad_mask (Variable): The mask of sequence.
+                Shape: (B, T, 1), dtype: int64.
+            slf_attn_mask (Variable, optional): The mask of self attention. Defaults to None.
+                Shape(B, len_q, len_k), len_q means the sequence length of query, 
+                len_k means the sequence length of key, dtype: int64.   
+                     
         Returns:
-            output (Variable), Shape(B, T, C), the output after self-attention & ffn.
-            slf_attn (Variable), Shape(B * n_head, T, T), the self attention.
+            output (Variable), the output after self-attention & ffn. Shape: (B, T, C).
+            slf_attn (Variable), the self attention. Shape: (B * n_head, T, T),
         """
         output, slf_attn = self.slf_attn(
             enc_input, enc_input, enc_input, mask=slf_attn_mask)
diff --git a/parakeet/models/fastspeech/length_regulator.py b/parakeet/models/fastspeech/length_regulator.py
index f6bc803..6ba53d7 100644
--- a/parakeet/models/fastspeech/length_regulator.py
+++ b/parakeet/models/fastspeech/length_regulator.py
@@ -69,15 +69,17 @@ class LengthRegulator(dg.Layer):
         Length Regulator block in FastSpeech.
         
         Args:
-            x (Variable): Shape(B, T, C), dtype: float32. The encoder output.
-            alpha (Constant): dtype: float32. The hyperparameter to determine the length of 
-                the expanded sequence mel, thereby controlling the voice speed.
-            target (Variable): (Variable, optional): Shape(B, T_text),
-                dtype: int64. The duration of phoneme compute from pretrained transformerTTS.
+            x (Variable): The encoder output.
+                Shape: (B, T, C), dtype: float32.
+            alpha (float32, optional): The hyperparameter to determine the length of 
+                the expanded sequence mel, thereby controlling the voice speed. Defaults to 1.0.
+            target (Variable, optional): The duration of phoneme compute from pretrained transformerTTS. 
+                Defaults to None. Shape: (B, T_text), dtype: int64.
 
         Returns:
-            output (Variable), Shape(B, T, C), the output after exppand.
-            duration_predictor_output (Variable), Shape(B, T, C), the output of duration predictor.
+            output (Variable), the output after exppand. Shape: (B, T, C), 
+            duration_predictor_output (Variable), the output of duration predictor.
+                Shape: (B, T, C).
         """
         duration_predictor_output = self.duration_predictor(x)
         if fluid.framework._dygraph_tracer()._train_mode:
diff --git a/parakeet/models/transformer_tts/cbhg.py b/parakeet/models/transformer_tts/cbhg.py
index ca93536..b21cd87 100644
--- a/parakeet/models/transformer_tts/cbhg.py
+++ b/parakeet/models/transformer_tts/cbhg.py
@@ -31,15 +31,7 @@ class CBHG(dg.Layer):
                  max_pool_kernel_size=2,
                  is_post=False):
         super(CBHG, self).__init__()
-        """
-        :param hidden_size: dimension of hidden unit
-        :param batch_size: batch size
-        :param K: # of convolution banks
-        :param projection_size: dimension of projection unit
-        :param num_gru_layers: # of layers of GRUcell
-        :param max_pool_kernel_size: max pooling kernel size
-        :param is_post: whether post processing or not
-        """
+
         self.hidden_size = hidden_size
         self.projection_size = projection_size
         self.conv_list = []
@@ -176,7 +168,15 @@ class CBHG(dg.Layer):
             return x
 
     def forward(self, input_):
-        # input_.shape = [N, C, T]
+        """
+        CBHG Module
+        Args:
+            input_(Variable): The sequentially input.
+                Shape: (B, C, T), dtype: float32. 
+
+        Returns:
+            (Variable): the CBHG output.
+        """
 
         conv_list = []
         conv_input = input_
@@ -249,6 +249,15 @@ class Highwaynet(dg.Layer):
             self.add_sublayer("gates_{}".format(i), gate)
 
     def forward(self, input_):
+        """
+        Highway network
+        Args:
+            input_(Variable): The sequentially input.
+                Shape: (B, T, C), dtype: float32. 
+
+        Returns:
+            (Variable): the Highway output.
+        """
         out = input_
 
         for linear, gate in zip(self.linears, self.gates):
diff --git a/parakeet/models/transformer_tts/decoder.py b/parakeet/models/transformer_tts/decoder.py
index 5b17a7a..54dc679 100644
--- a/parakeet/models/transformer_tts/decoder.py
+++ b/parakeet/models/transformer_tts/decoder.py
@@ -22,7 +22,7 @@ from parakeet.models.transformer_tts.post_convnet import PostConvNet
 
 
 class Decoder(dg.Layer):
-    def __init__(self, num_hidden, config, num_head=4):
+    def __init__(self, num_hidden, config, num_head=4, n_layers=3):
         super(Decoder, self).__init__()
         self.num_hidden = num_hidden
         self.num_head = num_head
@@ -58,20 +58,20 @@ class Decoder(dg.Layer):
 
         self.selfattn_layers = [
             MultiheadAttention(num_hidden, num_hidden // num_head,
-                               num_hidden // num_head) for _ in range(3)
+                               num_hidden // num_head) for _ in range(n_layers)
         ]
         for i, layer in enumerate(self.selfattn_layers):
             self.add_sublayer("self_attn_{}".format(i), layer)
         self.attn_layers = [
             MultiheadAttention(num_hidden, num_hidden // num_head,
-                               num_hidden // num_head) for _ in range(3)
+                               num_hidden // num_head) for _ in range(n_layers)
         ]
         for i, layer in enumerate(self.attn_layers):
             self.add_sublayer("attn_{}".format(i), layer)
         self.ffns = [
             PositionwiseFeedForward(
                 num_hidden, num_hidden * num_head, filter_size=1)
-            for _ in range(3)
+            for _ in range(n_layers)
         ]
         for i, layer in enumerate(self.ffns):
             self.add_sublayer("ffns_{}".format(i), layer)
@@ -108,6 +108,40 @@ class Decoder(dg.Layer):
                 m_mask=None,
                 m_self_mask=None,
                 zero_mask=None):
+        """
+        Decoder layer of TransformerTTS.
+        Args:
+            key (Variable): The input key of decoder.
+                Shape: (B, T_text, C), T_text means the timesteps of input text,
+                dtype: float32. 
+            value (Variable): The . input value of decoder.
+                Shape: (B, T_text, C), dtype: float32.
+            query (Variable): The input query of decoder.
+                Shape: (B, T_mel, C), T_mel means the timesteps of input spectrum,
+                dtype: float32.
+            positional (Variable): The spectrum position. 
+                Shape: (B, T_mel), dtype: int64.
+            mask (Variable): the mask of decoder self attention.
+                Shape: (B, T_mel, T_mel), dtype: int64.
+            m_mask (Variable, optional): the query mask of encoder-decoder attention. Defaults to None.
+                Shape: (B, T_mel, 1), dtype: int64.
+            m_self_mask (Variable, optional): the query mask of decoder self attention. Defaults to None.
+                Shape: (B, T_mel, 1), dtype: int64.
+            zero_mask (Variable, optional): query mask of encoder-decoder attention. Defaults to None.
+                Shape: (B, T_mel, T_text), dtype: int64.
+                
+        Returns:
+            mel_out (Variable): the decoder output after mel linear projection.
+                Shape: (B, T_mel, C).
+            out (Variable): the decoder output after post mel network.
+                Shape: (B, T_mel, C).
+            stop_tokens (Variable): the stop tokens of output.
+                Shape: (B, T_mel, 1)
+            attn_list (list[Variable]): the encoder-decoder attention list.
+                Len: n_layers.
+            selfattn_list (list[Variable]): the decoder self attention list.
+                Len: n_layers.
+        """
 
         # get decoder mask with triangular matrix
 
@@ -121,7 +155,7 @@ class Decoder(dg.Layer):
         else:
             m_mask, m_self_mask, zero_mask = None, None, None
 
-# Decoder pre-network
+        # Decoder pre-network
         query = self.decoder_prenet(query)
 
         # Centered position
diff --git a/parakeet/models/transformer_tts/encoder.py b/parakeet/models/transformer_tts/encoder.py
index ef3821f..748b423 100644
--- a/parakeet/models/transformer_tts/encoder.py
+++ b/parakeet/models/transformer_tts/encoder.py
@@ -20,7 +20,7 @@ from parakeet.models.transformer_tts.encoderprenet import EncoderPrenet
 
 
 class Encoder(dg.Layer):
-    def __init__(self, embedding_size, num_hidden, num_head=4):
+    def __init__(self, embedding_size, num_hidden, num_head=4, n_layers=3):
         super(Encoder, self).__init__()
         self.num_hidden = num_hidden
         self.num_head = num_head
@@ -42,7 +42,7 @@ class Encoder(dg.Layer):
             use_cudnn=True)
         self.layers = [
             MultiheadAttention(num_hidden, num_hidden // num_head,
-                               num_hidden // num_head) for _ in range(3)
+                               num_hidden // num_head) for _ in range(n_layers)
         ]
         for i, layer in enumerate(self.layers):
             self.add_sublayer("self_attn_{}".format(i), layer)
@@ -51,12 +51,31 @@ class Encoder(dg.Layer):
                 num_hidden,
                 num_hidden * num_head,
                 filter_size=1,
-                use_cudnn=True) for _ in range(3)
+                use_cudnn=True) for _ in range(n_layers)
         ]
         for i, layer in enumerate(self.ffns):
             self.add_sublayer("ffns_{}".format(i), layer)
 
     def forward(self, x, positional, mask=None, query_mask=None):
+        """
+        Encoder layer of TransformerTTS.
+        Args:
+            x (Variable): The input character.
+                Shape: (B, T_text), T_text means the timesteps of input text,
+                dtype: float32. 
+            positional (Variable): The characters position. 
+                Shape: (B, T_text), dtype: int64.
+            mask (Variable, optional): the mask of encoder self attention. Defaults to None.
+                Shape: (B, T_text, T_text), dtype: int64.
+            query_mask (Variable, optional): the query mask of encoder self attention. Defaults to None.
+                Shape: (B, T_text, 1), dtype: int64.
+                
+        Returns:
+            x (Variable): the encoder output.
+                Shape: (B, T_text, C).
+            attentions (list[Variable]): the encoder self attention list.
+                Len: n_layers.
+        """
 
         if fluid.framework._dygraph_tracer()._train_mode:
             seq_len_key = x.shape[1]
@@ -66,12 +85,12 @@ class Encoder(dg.Layer):
         else:
             query_mask, mask = None, None
         # Encoder pre_network
-        x = self.encoder_prenet(x)  #(N,T,C)
+        x = self.encoder_prenet(x)
 
         # Get positional encoding
         positional = self.pos_emb(positional)
 
-        x = positional * self.alpha + x  #(N, T, C)
+        x = positional * self.alpha + x
 
         # Positional dropout
         x = layers.dropout(x, 0.1, dropout_implementation='upscale_in_train')
diff --git a/parakeet/models/transformer_tts/encoderprenet.py b/parakeet/models/transformer_tts/encoderprenet.py
index e953dab..0e4cd45 100644
--- a/parakeet/models/transformer_tts/encoderprenet.py
+++ b/parakeet/models/transformer_tts/encoderprenet.py
@@ -81,8 +81,18 @@ class EncoderPrenet(dg.Layer):
                 low=-k, high=k)))
 
     def forward(self, x):
+        """
+        Encoder prenet layer of TransformerTTS.
+        Args:
+            x (Variable): The input character.
+                Shape: (B, T_text), T_text means the timesteps of input text,
+                dtype: float32. 
+                
+        Returns:
+            (Variable): the encoder prenet output. Shape: (B, T_text, C).
+        """
 
-        x = self.embedding(x)  #(batch_size, seq_len, embending_size)
+        x = self.embedding(x)
         x = layers.transpose(x, [0, 2, 1])
         for batch_norm, conv in zip(self.batch_norm_list, self.conv_list):
             x = layers.dropout(
diff --git a/parakeet/models/transformer_tts/post_convnet.py b/parakeet/models/transformer_tts/post_convnet.py
index 60e9382..c754ca2 100644
--- a/parakeet/models/transformer_tts/post_convnet.py
+++ b/parakeet/models/transformer_tts/post_convnet.py
@@ -93,12 +93,13 @@ class PostConvNet(dg.Layer):
 
     def forward(self, input):
         """
-        Post Conv Net.
+        Decocder Post Conv Net of TransformerTTS.
         
         Args:
-            input (Variable): Shape(B, T, C), dtype: float32. The input value.
+            input (Variable):  The result of mel linear projection. 
+                Shape: (B, T, C), dtype: float32.
         Returns:
-            output (Variable), Shape(B, T, C), the result after postconvnet.
+           (Variable): the result after postconvnet. Shape: (B, T, C),
         """
 
         input = layers.transpose(input, [0, 2, 1])
diff --git a/parakeet/models/transformer_tts/prenet.py b/parakeet/models/transformer_tts/prenet.py
index b47a9f8..c6d2428 100644
--- a/parakeet/models/transformer_tts/prenet.py
+++ b/parakeet/models/transformer_tts/prenet.py
@@ -19,11 +19,6 @@ import paddle.fluid.layers as layers
 
 class PreNet(dg.Layer):
     def __init__(self, input_size, hidden_size, output_size, dropout_rate=0.2):
-        """
-        :param input_size: dimension of input
-        :param hidden_size: dimension of hidden unit
-        :param output_size: dimension of output
-        """
         super(PreNet, self).__init__()
         self.input_size = input_size
         self.hidden_size = hidden_size
@@ -52,9 +47,10 @@ class PreNet(dg.Layer):
         Pre Net before passing through the network.
         
         Args:
-            x (Variable): Shape(B, T, C), dtype: float32. The input value.
+            x (Variable): The input value.
+                Shape: (B, T, C), dtype: float32.
         Returns:
-            x (Variable), Shape(B, T, C), the result after pernet.
+            (Variable), the result after pernet. Shape: (B, T, C),
         """
         x = layers.dropout(
             layers.relu(self.linear1(x)),
diff --git a/parakeet/models/transformer_tts/transformer_tts.py b/parakeet/models/transformer_tts/transformer_tts.py
index a7fffbd..ca605bf 100644
--- a/parakeet/models/transformer_tts/transformer_tts.py
+++ b/parakeet/models/transformer_tts/transformer_tts.py
@@ -35,6 +35,46 @@ class TransformerTTS(dg.Layer):
                 enc_dec_mask=None,
                 dec_query_slf_mask=None,
                 dec_query_mask=None):
+        """
+        TransformerTTS network.
+        Args:
+            characters (Variable): The input character.
+                Shape: (B, T_text), T_text means the timesteps of input text,
+                dtype: float32. 
+            mel_input (Variable): The input query of decoder.
+                Shape: (B, T_mel, C), T_mel means the timesteps of input spectrum,
+                dtype: float32.
+            pos_text (Variable): The characters position. 
+                Shape: (B, T_text), dtype: int64.
+            dec_slf_mask (Variable): The spectrum position. 
+                Shape: (B, T_mel), dtype: int64.
+            mask (Variable): the mask of decoder self attention.
+                Shape: (B, T_mel, T_mel), dtype: int64.
+            enc_slf_mask (Variable, optional): the mask of encoder self attention. Defaults to None.
+                Shape: (B, T_text, T_text), dtype: int64.
+            enc_query_mask (Variable, optional): the query mask of encoder self attention. Defaults to None.
+                Shape: (B, T_text, 1), dtype: int64.
+            dec_query_mask (Variable, optional): the query mask of encoder-decoder attention. Defaults to None.
+                Shape: (B, T_mel, 1), dtype: int64.
+            dec_query_slf_mask (Variable, optional): the query mask of decoder self attention. Defaults to None.
+                Shape: (B, T_mel, 1), dtype: int64.
+            enc_dec_mask (Variable, optional): query mask of encoder-decoder attention. Defaults to None.
+                Shape: (B, T_mel, T_text), dtype: int64.
+                
+        Returns:
+            mel_output (Variable): the decoder output after mel linear projection.
+                Shape: (B, T_mel, C).
+            postnet_output (Variable): the decoder output after post mel network.
+                Shape: (B, T_mel, C).
+            stop_preds (Variable): the stop tokens of output.
+                Shape: (B, T_mel, 1)
+            attn_probs (list[Variable]): the encoder-decoder attention list.
+                Len: n_layers.
+            attns_enc (list[Variable]): the encoder self attention list.
+                Len: n_layers.
+            attns_dec (list[Variable]): the decoder self attention list.
+                Len: n_layers.
+        """
         key, attns_enc = self.encoder(
             characters, pos_text, mask=enc_slf_mask, query_mask=enc_query_mask)
 
@@ -48,5 +88,3 @@ class TransformerTTS(dg.Layer):
             m_self_mask=dec_query_slf_mask,
             m_mask=dec_query_mask)
         return mel_output, postnet_output, attn_probs, stop_preds, attns_enc, attns_dec
-
-        return mel_output, postnet_output, attn_probs, stop_preds, attns_enc, attns_dec
diff --git a/parakeet/models/transformer_tts/vocoder.py b/parakeet/models/transformer_tts/vocoder.py
index 33ffe1c..654467b 100644
--- a/parakeet/models/transformer_tts/vocoder.py
+++ b/parakeet/models/transformer_tts/vocoder.py
@@ -19,10 +19,6 @@ from parakeet.models.transformer_tts.cbhg import CBHG
 
 
 class Vocoder(dg.Layer):
-    """
-    CBHG Network (mel -> linear)
-    """
-
     def __init__(self, config, batch_size):
         super(Vocoder, self).__init__()
         self.pre_proj = Conv1D(
@@ -36,6 +32,16 @@ class Vocoder(dg.Layer):
             filter_size=1)
 
     def forward(self, mel):
+        """
+        CBHG Network (mel -> linear)
+        Args:
+            mel (Variable): The input mel spectrum.
+                Shape: (B, C, T), dtype: float32. 
+                
+        Returns:
+            (Variable): the linear output.
+                Shape: (B, T, C).
+        """
         mel = layers.transpose(mel, [0, 2, 1])
         mel = self.pre_proj(mel)
         mel = self.cbhg(mel)
diff --git a/parakeet/modules/dynamic_gru.py b/parakeet/modules/dynamic_gru.py
index 9e55688..19fa060 100644
--- a/parakeet/modules/dynamic_gru.py
+++ b/parakeet/modules/dynamic_gru.py
@@ -43,9 +43,10 @@ class DynamicGRU(dg.Layer):
         Dynamic GRU block.
         
         Args:
-            input (Variable): Shape(B, T, C), dtype: float32. The input value.
+            input (Variable): The input value.
+                Shape: (B, T, C), dtype: float32. 
         Returns:
-            output (Variable), Shape(B, T, C), the result compute by GRU.
+            output (Variable), the result compute by GRU. Shape: (B, T, C).
         """
         hidden = self.h_0
         res = []
diff --git a/parakeet/modules/ffn.py b/parakeet/modules/ffn.py
index fe39d3c..7aa7f4a 100644
--- a/parakeet/modules/ffn.py
+++ b/parakeet/modules/ffn.py
@@ -62,9 +62,10 @@ class PositionwiseFeedForward(dg.Layer):
         Feed Forward Network.
         
         Args:
-            input (Variable): Shape(B, T, C), dtype: float32. The input value.
+            input (Variable): The input value. 
+                Shape: (B, T, C), dtype: float32.
         Returns:
-            output (Variable), Shape(B, T, C), the result after FFN.
+            output (Variable), the result after FFN. Shape: (B, T, C).
         """
         x = layers.transpose(input, [0, 2, 1])
         #FFN Networt
diff --git a/parakeet/modules/modules.py b/parakeet/modules/modules.py
deleted file mode 100644
index 72a8d2d..0000000
--- a/parakeet/modules/modules.py
+++ /dev/null
@@ -1,610 +0,0 @@
-#   Copyright (c) 2019 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.
-
-import paddle
-from paddle import fluid
-import paddle.fluid.dygraph as dg
-
-import numpy as np
-
-from . import conv
-from . import weight_norm
-
-
-def FC(name_scope,
-       in_features,
-       size,
-       num_flatten_dims=1,
-       relu=False,
-       dropout=0.0,
-       epsilon=1e-30,
-       act=None,
-       is_test=False,
-       dtype="float32"):
-    """
-    A special Linear Layer, when it is used with dropout, the weight is 
-    initialized as normal(0, std=np.sqrt((1-dropout) / in_features))
-    """
-
-    # stds
-    if isinstance(in_features, int):
-        in_features = [in_features]
-
-    stds = [np.sqrt((1 - dropout) / in_feature) for in_feature in in_features]
-    if relu:
-        stds = [std * np.sqrt(2.0) for std in stds]
-
-    weight_inits = [
-        fluid.initializer.NormalInitializer(scale=std) for std in stds
-    ]
-    bias_init = fluid.initializer.ConstantInitializer(0.0)
-
-    # param attrs
-    weight_attrs = [fluid.ParamAttr(initializer=init) for init in weight_inits]
-    bias_attr = fluid.ParamAttr(initializer=bias_init)
-
-    layer = weight_norm.FC(name_scope,
-                           size,
-                           num_flatten_dims=num_flatten_dims,
-                           param_attr=weight_attrs,
-                           bias_attr=bias_attr,
-                           act=act,
-                           dtype=dtype)
-    return layer
-
-
-def Conv1D(name_scope,
-           in_channels,
-           num_filters,
-           filter_size=3,
-           dilation=1,
-           groups=None,
-           causal=False,
-           std_mul=1.0,
-           dropout=0.0,
-           use_cudnn=True,
-           act=None,
-           dtype="float32"):
-    """
-    A special Conv1D Layer, when it is used with dropout, the weight is 
-    initialized as 
-    normal(0, std=np.sqrt(std_mul * (1-dropout) / (filter_size * in_features)))
-    """
-    # std
-    std = np.sqrt((std_mul * (1 - dropout)) / (filter_size * in_channels))
-    weight_init = fluid.initializer.NormalInitializer(loc=0.0, scale=std)
-    bias_init = fluid.initializer.ConstantInitializer(0.0)
-
-    # param attrs
-    weight_attr = fluid.ParamAttr(initializer=weight_init)
-    bias_attr = fluid.ParamAttr(initializer=bias_init)
-
-    layer = conv.Conv1D(
-        name_scope,
-        in_channels,
-        num_filters,
-        filter_size,
-        dilation,
-        groups=groups,
-        causal=causal,
-        param_attr=weight_attr,
-        bias_attr=bias_attr,
-        use_cudnn=use_cudnn,
-        act=act,
-        dtype=dtype)
-    return layer
-
-
-def Embedding(name_scope,
-              num_embeddings,
-              embed_dim,
-              is_sparse=False,
-              is_distributed=False,
-              padding_idx=None,
-              std=0.01,
-              dtype="float32"):
-    # param attrs
-    weight_attr = fluid.ParamAttr(initializer=fluid.initializer.Normal(
-        scale=std))
-    layer = dg.Embedding(
-        name_scope, (num_embeddings, embed_dim),
-        padding_idx=padding_idx,
-        param_attr=weight_attr,
-        dtype=dtype)
-    return layer
-
-
-class Conv1DGLU(dg.Layer):
-    """
-    A Convolution 1D block with GLU activation. It also applys dropout for the 
-    input x. It fuses speaker embeddings through a FC activated by softsign. It
-    has residual connection from the input x, and scale the output by 
-    np.sqrt(0.5).
-    """
-
-    def __init__(self,
-                 name_scope,
-                 n_speakers,
-                 speaker_dim,
-                 in_channels,
-                 num_filters,
-                 filter_size,
-                 dilation,
-                 std_mul=4.0,
-                 dropout=0.0,
-                 causal=False,
-                 residual=True,
-                 dtype="float32"):
-        super(Conv1DGLU, self).__init__(name_scope, dtype=dtype)
-
-        # conv spec
-        self.in_channels = in_channels
-        self.n_speakers = n_speakers
-        self.speaker_dim = speaker_dim
-        self.num_filters = num_filters
-        self.filter_size = filter_size
-        self.dilation = dilation
-        self.causal = causal
-        self.residual = residual
-
-        # weight init and dropout
-        self.std_mul = std_mul
-        self.dropout = dropout
-
-        if residual:
-            assert (
-                in_channels == num_filters
-            ), "this block uses residual connection"\
-                "the input_channes should equals num_filters"
-
-        self.conv = Conv1D(
-            self.full_name(),
-            in_channels,
-            2 * num_filters,
-            filter_size,
-            dilation,
-            causal=causal,
-            std_mul=std_mul,
-            dropout=dropout,
-            dtype=dtype)
-
-        if n_speakers > 1:
-            assert (speaker_dim is not None
-                    ), "speaker embed should not be null in multi-speaker case"
-            self.fc = Conv1D(
-                self.full_name(),
-                speaker_dim,
-                num_filters,
-                filter_size=1,
-                dilation=1,
-                causal=False,
-                act="softsign",
-                dtype=dtype)
-
-    def forward(self, x, speaker_embed_bc1t=None):
-        """
-        Args:
-            x (Variable): Shape(B, C_in, 1, T), the input of Conv1DGLU
-                layer, where B means batch_size, C_in means the input channels
-                T means input time steps.
-            speaker_embed_bct1 (Variable): Shape(B, C_sp, 1, T), expanded
-                speaker embed, where C_sp means speaker embedding size. Note
-                that when using residual connection, the Conv1DGLU does not
-                change the number of channels, so out channels equals input
-                channels.
-
-        Returns:
-            x (Variable): Shape(B, C_out, 1, T), the output of Conv1DGLU, where
-                C_out means the output channels of Conv1DGLU.
-        """
-
-        residual = x
-        x = fluid.layers.dropout(x, self.dropout)
-        x = self.conv(x)
-
-        content, gate = fluid.layers.split(x, num_or_sections=2, dim=1)
-
-        if speaker_embed_bc1t is not None:
-            sp = self.fc(speaker_embed_bc1t)
-            content = content + sp
-
-        # glu
-        x = fluid.layers.elementwise_mul(fluid.layers.sigmoid(gate), content)
-
-        if self.residual:
-            x = fluid.layers.scale(x + residual, np.sqrt(0.5))
-        return x
-
-    def add_input(self, x, speaker_embed_bc11=None):
-        """
-        Inputs:
-        x: shape(B, num_filters, 1, time_steps)
-        speaker_embed_bc11: shape(B, speaker_dim, 1, time_steps)
-
-        Outputs:
-        out: shape(B, num_filters, 1, time_steps), where time_steps = 1
-        """
-
-        residual = x
-
-        # add step input and produce step output
-        x = fluid.layers.dropout(x, self.dropout)
-        x = self.conv.add_input(x)
-
-        content, gate = fluid.layers.split(x, num_or_sections=2, dim=1)
-
-        if speaker_embed_bc11 is not None:
-            sp = self.fc(speaker_embed_bc11)
-            content = content + sp
-
-        x = fluid.layers.elementwise_mul(fluid.layers.sigmoid(gate), content)
-
-        if self.residual:
-            x = fluid.layers.scale(x + residual, np.sqrt(0.5))
-        return x
-
-
-def Conv1DTranspose(name_scope,
-                    in_channels,
-                    num_filters,
-                    filter_size,
-                    padding=0,
-                    stride=1,
-                    dilation=1,
-                    groups=None,
-                    std_mul=1.0,
-                    dropout=0.0,
-                    use_cudnn=True,
-                    act=None,
-                    dtype="float32"):
-    std = np.sqrt(std_mul * (1 - dropout) / (in_channels * filter_size))
-    weight_init = fluid.initializer.NormalInitializer(scale=std)
-    weight_attr = fluid.ParamAttr(initializer=weight_init)
-    bias_init = fluid.initializer.ConstantInitializer(0.0)
-    bias_attr = fluid.ParamAttr(initializer=bias_init)
-    layer = conv.Conv1DTranspose(
-        name_scope,
-        in_channels,
-        num_filters,
-        filter_size,
-        padding=padding,
-        stride=stride,
-        dilation=dilation,
-        groups=groups,
-        param_attr=weight_attr,
-        bias_attr=bias_attr,
-        use_cudnn=use_cudnn,
-        act=act,
-        dtype=dtype)
-    return layer
-
-
-def compute_position_embedding(rad):
-    # rad is a transposed radius, shape(embed_dim, n_vocab)
-    embed_dim, n_vocab = rad.shape
-
-    even_dims = dg.to_variable(np.arange(0, embed_dim, 2).astype("int32"))
-    odd_dims = dg.to_variable(np.arange(1, embed_dim, 2).astype("int32"))
-
-    even_rads = fluid.layers.gather(rad, even_dims)
-    odd_rads = fluid.layers.gather(rad, odd_dims)
-
-    sines = fluid.layers.sin(even_rads)
-    cosines = fluid.layers.cos(odd_rads)
-
-    temp = fluid.layers.scatter(rad, even_dims, sines)
-    out = fluid.layers.scatter(temp, odd_dims, cosines)
-    out = fluid.layers.transpose(out, perm=[1, 0])
-    return out
-
-
-def position_encoding_init(n_position,
-                           d_pos_vec,
-                           position_rate=1.0,
-                           sinusoidal=True):
-    """ Init the sinusoid position encoding table """
-
-    # keep idx 0 for padding token position encoding zero vector
-    position_enc = np.array([[
-        position_rate * pos / np.power(10000, 2 * (i // 2) / d_pos_vec)
-        for i in range(d_pos_vec)
-    ] if pos != 0 else np.zeros(d_pos_vec) for pos in range(n_position)])
-
-    if sinusoidal:
-        position_enc[1:, 0::2] = np.sin(position_enc[1:, 0::2])  # dim 2i
-        position_enc[1:, 1::2] = np.cos(position_enc[1:, 1::2])  # dim 2i+1
-
-    return position_enc
-
-
-class PositionEmbedding(dg.Layer):
-    def __init__(self,
-                 name_scope,
-                 n_position,
-                 d_pos_vec,
-                 position_rate=1.0,
-                 is_sparse=False,
-                 is_distributed=False,
-                 param_attr=None,
-                 max_norm=None,
-                 padding_idx=None,
-                 dtype="float32"):
-        super(PositionEmbedding, self).__init__(name_scope, dtype=dtype)
-        self.embed = dg.Embedding(
-            self.full_name(),
-            size=(n_position, d_pos_vec),
-            is_sparse=is_sparse,
-            is_distributed=is_distributed,
-            padding_idx=None,
-            param_attr=param_attr,
-            dtype=dtype)
-        self.set_weight(
-            position_encoding_init(
-                n_position,
-                d_pos_vec,
-                position_rate=position_rate,
-                sinusoidal=False).astype(dtype))
-
-        self._is_sparse = is_sparse
-        self._is_distributed = is_distributed
-        self._remote_prefetch = self._is_sparse and (not self._is_distributed)
-        if self._remote_prefetch:
-            assert self._is_sparse is True and self._is_distributed is False
-
-        self._padding_idx = (-1 if padding_idx is None else padding_idx if
-                             padding_idx >= 0 else (n_position + padding_idx))
-        self._position_rate = position_rate
-        self._max_norm = max_norm
-        self._dtype = dtype
-
-    def set_weight(self, array):
-        assert self.embed._w.shape == list(array.shape), "shape does not match"
-        self.embed._w._ivar.value().get_tensor().set(
-            array, fluid.framework._current_expected_place())
-
-    def forward(self, indices, speaker_position_rate=None):
-        """
-        Args:
-            indices (Variable): Shape (B, T, 1), dtype: int64, position
-                indices, where B means the batch size, T means the time steps.
-            speaker_position_rate (Variable | float, optional), position
-                rate. It can be a float point number or a Variable with 
-                shape (1,), then this speaker_position_rate is used for every 
-                example. It can also be a Variable with shape (B, 1), which 
-                contains a speaker position rate for each speaker.
-        Returns:
-            out (Variable): Shape(B, C_pos), position embedding, where C_pos 
-                means position embedding size.
-        """
-        rad = fluid.layers.transpose(self.embed._w, perm=[1, 0])
-        batch_size = indices.shape[0]
-
-        if speaker_position_rate is None:
-            weight = compute_position_embedding(rad)
-            out = self._helper.create_variable_for_type_inference(self._dtype)
-            self._helper.append_op(
-                type="lookup_table",
-                inputs={"Ids": indices,
-                        "W": weight},
-                outputs={"Out": out},
-                attrs={
-                    "is_sparse": self._is_sparse,
-                    "is_distributed": self._is_distributed,
-                    "remote_prefetch": self._remote_prefetch,
-                    "padding_idx":
-                    self._padding_idx,  # special value for lookup table op
-                })
-            return out
-
-        elif (np.isscalar(speaker_position_rate) or
-              isinstance(speaker_position_rate, fluid.framework.Variable) and
-              speaker_position_rate.shape == [1, 1]):
-            # # make a weight
-            # scale the weight (the operand for sin & cos)
-            if np.isscalar(speaker_position_rate):
-                scaled_rad = fluid.layers.scale(rad, speaker_position_rate)
-            else:
-                scaled_rad = fluid.layers.elementwise_mul(
-                    rad, speaker_position_rate[0])
-            weight = compute_position_embedding(scaled_rad)
-            out = self._helper.create_variable_for_type_inference(self._dtype)
-            self._helper.append_op(
-                type="lookup_table",
-                inputs={"Ids": indices,
-                        "W": weight},
-                outputs={"Out": out},
-                attrs={
-                    "is_sparse": self._is_sparse,
-                    "is_distributed": self._is_distributed,
-                    "remote_prefetch": self._remote_prefetch,
-                    "padding_idx":
-                    self._padding_idx,  # special value for lookup table op
-                })
-            return out
-
-        elif np.prod(speaker_position_rate.shape) > 1:
-            assert speaker_position_rate.shape == [batch_size, 1]
-            outputs = []
-            for i in range(batch_size):
-                rate = speaker_position_rate[i]  # rate has shape [1]
-                scaled_rad = fluid.layers.elementwise_mul(rad, rate)
-                weight = compute_position_embedding(scaled_rad)
-                out = self._helper.create_variable_for_type_inference(
-                    self._dtype)
-                sequence = indices[i]
-                self._helper.append_op(
-                    type="lookup_table",
-                    inputs={"Ids": sequence,
-                            "W": weight},
-                    outputs={"Out": out},
-                    attrs={
-                        "is_sparse": self._is_sparse,
-                        "is_distributed": self._is_distributed,
-                        "remote_prefetch": self._remote_prefetch,
-                        "padding_idx": -1,
-                    })
-                outputs.append(out)
-            out = fluid.layers.stack(outputs)
-            return out
-        else:
-            raise Exception("Then you can just use position rate at init")
-
-
-class Conv1D_GU(dg.Layer):
-    def __init__(self,
-                 name_scope,
-                 conditioner_dim,
-                 in_channels,
-                 num_filters,
-                 filter_size,
-                 dilation,
-                 causal=False,
-                 residual=True,
-                 dtype="float32"):
-        super(Conv1D_GU, self).__init__(name_scope, dtype=dtype)
-
-        self.conditioner_dim = conditioner_dim
-        self.in_channels = in_channels
-        self.num_filters = num_filters
-        self.filter_size = filter_size
-        self.dilation = dilation
-        self.causal = causal
-        self.residual = residual
-
-        if residual:
-            assert (
-                in_channels == num_filters
-            ), "this block uses residual connection"\
-                "the input_channels should equals num_filters"
-
-        self.conv = Conv1D(
-            self.full_name(),
-            in_channels,
-            2 * num_filters,
-            filter_size,
-            dilation,
-            causal=causal,
-            dtype=dtype)
-
-        self.fc = Conv1D(
-            self.full_name(),
-            conditioner_dim,
-            2 * num_filters,
-            filter_size=1,
-            dilation=1,
-            causal=False,
-            dtype=dtype)
-
-    def forward(self, x, skip=None, conditioner=None):
-        """
-        Args:
-            x (Variable): Shape(B, C_in, 1, T), the input of Conv1D_GU
-                layer, where B means batch_size, C_in means the input channels
-                T means input time steps.
-            skip (Variable): Shape(B, C_in, 1, T), skip connection.
-            conditioner (Variable): Shape(B, C_con, 1, T), expanded mel
-                conditioner, where C_con is conditioner hidden dim which
-                equals the num of mel bands. Note that when using residual
-                connection, the Conv1D_GU does not change the number of
-                channels, so out channels equals input channels.
-        Returns:
-            x (Variable): Shape(B, C_out, 1, T), the output of Conv1D_GU, where
-                C_out means the output channels of Conv1D_GU.
-            skip (Variable): Shape(B, C_out, 1, T), skip connection.
-        """
-        residual = x
-        x = self.conv(x)
-
-        if conditioner is not None:
-            cond_bias = self.fc(conditioner)
-            x += cond_bias
-
-        content, gate = fluid.layers.split(x, num_or_sections=2, dim=1)
-
-        # Gated Unit.
-        x = fluid.layers.elementwise_mul(
-            fluid.layers.sigmoid(gate), fluid.layers.tanh(content))
-
-        if skip is None:
-            skip = x
-        else:
-            skip = fluid.layers.scale(skip + x, np.sqrt(0.5))
-
-        if self.residual:
-            x = fluid.layers.scale(residual + x, np.sqrt(0.5))
-
-        return x, skip
-
-    def add_input(self, x, skip=None, conditioner=None):
-        """
-        Inputs:
-            x: shape(B, num_filters, 1, time_steps)
-            skip: shape(B, num_filters, 1, time_steps), skip connection
-            conditioner: shape(B, conditioner_dim, 1, time_steps)
-        Outputs:
-            x: shape(B, num_filters, 1, time_steps), where time_steps = 1
-            skip: skip connection, same shape as x
-        """
-        residual = x
-
-        # add step input and produce step output
-        x = self.conv.add_input(x)
-
-        if conditioner is not None:
-            cond_bias = self.fc(conditioner)
-            x += cond_bias
-
-        content, gate = fluid.layers.split(x, num_or_sections=2, dim=1)
-
-        # Gated Unit.
-        x = fluid.layers.elementwise_mul(
-            fluid.layers.sigmoid(gate), fluid.layers.tanh(content))
-
-        if skip is None:
-            skip = x
-        else:
-            skip = fluid.layers.scale(skip + x, np.sqrt(0.5))
-
-        if self.residual:
-            x = fluid.layers.scale(residual + x, np.sqrt(0.5))
-
-        return x, skip
-
-
-def Conv2DTranspose(name_scope,
-                    num_filters,
-                    filter_size,
-                    padding=0,
-                    stride=1,
-                    dilation=1,
-                    use_cudnn=True,
-                    act=None,
-                    dtype="float32"):
-    val = 1.0 / (filter_size[0] * filter_size[1])
-    weight_init = fluid.initializer.ConstantInitializer(val)
-    weight_attr = fluid.ParamAttr(initializer=weight_init)
-
-    layer = weight_norm.Conv2DTranspose(
-        name_scope,
-        num_filters,
-        filter_size=filter_size,
-        padding=padding,
-        stride=stride,
-        dilation=dilation,
-        param_attr=weight_attr,
-        use_cudnn=use_cudnn,
-        act=act,
-        dtype=dtype)
-
-    return layer
diff --git a/parakeet/modules/multihead_attention.py b/parakeet/modules/multihead_attention.py
index 624d3ae..04cf947 100644
--- a/parakeet/modules/multihead_attention.py
+++ b/parakeet/modules/multihead_attention.py
@@ -66,12 +66,17 @@ class ScaledDotProductAttention(dg.Layer):
         Scaled Dot Product Attention.
         
         Args:
-            key (Variable): Shape(B, T, C), dtype: float32. The input key of attention.
-            value (Variable): Shape(B, T, C), dtype: float32. The input value of attention.
-            query (Variable): Shape(B, T, C), dtype: float32. The input query of attention.
-            mask (Variable): Shape(B, len_q, len_k), dtype: float32. The mask of key.
-            query_mask (Variable): Shape(B, len_q, 1), dtype: float32. The mask of query.
-            dropout (Constant): dtype: float32. The probability of dropout.
+            key (Variable): The input key of scaled dot product attention.
+                Shape: (B, T, C), dtype: float32.
+            value (Variable):  The input value of scaled dot product attention.
+                Shape: (B, T, C), dtype: float32.
+            query (Variable): The input query of scaled dot product attention.
+                Shape: (B, T, C), dtype: float32. 
+            mask (Variable, optional): The mask of key.  Defaults to None.
+                Shape(B, T_q, T_k), dtype: float32.
+            query_mask (Variable, optional):  The mask of query.  Defaults to None.
+                Shape(B, T_q, T_q), dtype: float32.
+            dropout (float32, optional): The probability of dropout.  Defaults to 0.1.
         Returns:
             result (Variable), Shape(B, T, C), the result of mutihead attention.
             attention (Variable), Shape(n_head * B, T, C), the attention of key.
@@ -131,14 +136,19 @@ class MultiheadAttention(dg.Layer):
         Multihead Attention.
         
         Args:
-            key (Variable): Shape(B, T, C), dtype: float32. The input key of attention.
-            value (Variable): Shape(B, T, C), dtype: float32. The input value of attention.
-            query_input (Variable): Shape(B, T, C), dtype: float32. The input query of attention.
-            mask (Variable): Shape(B, len_q, len_k), dtype: float32. The mask of key.
-            query_mask (Variable): Shape(B, len_q, 1), dtype: float32. The mask of query.
+            key (Variable): The input key of attention.
+                Shape: (B, T, C), dtype: float32.
+            value (Variable): The input value of attention.
+                Shape: (B, T, C), dtype: float32.
+            query_input (Variable): The input query of attention.
+                Shape: (B, T, C), dtype: float32. 
+            mask (Variable, optional): The mask of key. Defaults to None.
+                Shape: (B, T_query, T_key), dtype: float32.
+            query_mask (Variable, optional): The mask of query. Defaults to None.
+                Shape: (B, T_query, T_key), dtype: float32.
         Returns:
-            result (Variable), Shape(B, T, C), the result of mutihead attention.
-            attention (Variable), Shape(n_head * B, T, C), the attention of key.
+            result (Variable), the result of mutihead attention. Shape: (B, T, C).
+            attention (Variable), the attention of key and query. Shape: (num_head * B, T, C)
         """
 
         batch_size = key.shape[0]
@@ -146,7 +156,6 @@ class MultiheadAttention(dg.Layer):
         seq_len_query = query_input.shape[1]
 
         # Make multihead attention
-        # key & value.shape = (batch_size, seq_len, feature)(feature = num_head * num_hidden_per_attn)
         key = layers.reshape(
             self.key(key), [batch_size, seq_len_key, self.num_head, self.d_k])
         value = layers.reshape(
@@ -168,18 +177,6 @@ class MultiheadAttention(dg.Layer):
         result, attention = self.scal_attn(
             key, value, query, mask=mask, query_mask=query_mask)
 
-        key = layers.reshape(
-            layers.transpose(key, [2, 0, 1, 3]), [-1, seq_len_key, self.d_k])
-        value = layers.reshape(
-            layers.transpose(value, [2, 0, 1, 3]),
-            [-1, seq_len_key, self.d_k])
-        query = layers.reshape(
-            layers.transpose(query, [2, 0, 1, 3]),
-            [-1, seq_len_query, self.d_q])
-
-        result, attention = self.scal_attn(
-            key, value, query, mask=mask, query_mask=query_mask)
-
         # concat all multihead result
         result = layers.reshape(
             result, [self.num_head, batch_size, seq_len_query, self.d_q])