diff --git a/paddlespeech/s2t/modules/attention.py b/paddlespeech/s2t/modules/attention.py
index 2166ca8bfea59db97e4a6ca15847d3617df1b48f..d9ee763f1a3c7552bc88dfd9b06c36b876aab7fc 100644
--- a/paddlespeech/s2t/modules/attention.py
+++ b/paddlespeech/s2t/modules/attention.py
@@ -19,8 +19,8 @@ from typing import Tuple
 
 import paddle
 from paddle import nn
-from paddle.nn import initializer as I
 from paddle.nn import functional as F
+from paddle.nn import initializer as I
 
 from paddlespeech.s2t.modules.align import Linear
 from paddlespeech.s2t.utils.log import Log
@@ -56,12 +56,12 @@ class MultiHeadedAttention(nn.Layer):
         self.linear_out = Linear(n_feat, n_feat)
         self.dropout = nn.Dropout(p=dropout_rate)
 
-
     def _build_once(self, *args, **kwargs):
         super()._build_once(*args, **kwargs)
         # if self.self_att:
         # self.linear_kv = Linear(self.n_feat, self.n_feat*2)
-        self.weight = paddle.concat([self.linear_k.weight, self.linear_v.weight], axis=-1)
+        self.weight = paddle.concat(
+            [self.linear_k.weight, self.linear_v.weight], axis=-1)
         self.bias = paddle.concat([self.linear_k.bias, self.linear_v.bias])
         self._built = True
 
@@ -84,12 +84,14 @@ class MultiHeadedAttention(nn.Layer):
                 (#batch, n_head, time2, d_k).
         """
         n_batch = query.shape[0]
-        
+
         q = self.linear_q(query).view(n_batch, -1, self.h, self.d_k)
         # k = self.linear_k(key).view(n_batch, -1, self.h, self.d_k)
         # v = self.linear_v(value).view(n_batch, -1, self.h, self.d_k)
-        k, v = F.linear(key, self.weight, self.bias).view(n_batch, -1, 2 * self.h, self.d_k).split(2, axis=2)
-      
+        k, v = F.linear(key, self.weight, self.bias).view(
+            n_batch, -1, 2 * self.h, self.d_k).split(
+                2, axis=2)
+
         q = q.transpose([0, 2, 1, 3])  # (batch, head, time1, d_k)
         k = k.transpose([0, 2, 1, 3])  # (batch, head, time2, d_k)
         v = v.transpose([0, 2, 1, 3])  # (batch, head, time2, d_k)
@@ -203,7 +205,7 @@ class MultiHeadedAttention(nn.Layer):
         new_cache = paddle.concat((k, v), axis=-1)
 
         # scores = paddle.matmul(q,
-                            #    k.transpose([0, 1, 3, 2])) / math.sqrt(self.d_k)
+        #    k.transpose([0, 1, 3, 2])) / math.sqrt(self.d_k)
         scores = paddle.matmul(q, k, transpose_y=True) / math.sqrt(self.d_k)
         return self.forward_attention(v, scores, mask), new_cache
 
diff --git a/paddlespeech/s2t/modules/encoder.py b/paddlespeech/s2t/modules/encoder.py
index f23d3f140aa13701cdf4aa7d223ee8d1fd34c790..fd7bd7b9a1dde64d0daec388b7436a111f30e7e5 100644
--- a/paddlespeech/s2t/modules/encoder.py
+++ b/paddlespeech/s2t/modules/encoder.py
@@ -221,7 +221,7 @@ class BaseEncoder(nn.Layer):
         xs, pos_emb, _ = self.embed(xs, tmp_masks, offset=offset)
         # after embed, xs=(B=1, chunk_size, hidden-dim)
 
-        elayers, _, cache_t1, _  = att_cache.shape
+        elayers, _, cache_t1, _ = att_cache.shape
         chunk_size = xs.shape[1]
         attention_key_size = cache_t1 + chunk_size
 
diff --git a/paddlespeech/s2t/modules/mask.py b/paddlespeech/s2t/modules/mask.py
index 787a06528f16ffd99bd5e738df6d1a75b71540bf..65619eb907606362baf09888d39fca0929e99116 100644
--- a/paddlespeech/s2t/modules/mask.py
+++ b/paddlespeech/s2t/modules/mask.py
@@ -110,7 +110,7 @@ def subsequent_mask(size: int) -> paddle.Tensor:
     """
     ret = paddle.ones([size, size], dtype=paddle.bool)
     return paddle.tril(ret)
-    
+
 
 def subsequent_chunk_mask(
         size: int,