fix codestyle

Author: duyiqi17

models/recall/mind/mind_reader.py

@@ -16,8 +16,10 @@
 import numpy as np
 from paddle.io import IterableDataset
 import random
+
 random.seed(12345)
 
+
 class RecDataset(IterableDataset):
     def __init__(self, file_list, config):
         super(RecDataset, self).__init__()

models/recall/mind/net.py

@@ -167,8 +167,10 @@ def sequence_mask(self, lengths, maxlen=None, dtype="bool"):
         batch_size = paddle.shape(lengths)[0]
         if maxlen is None:
             maxlen = lengths.max()
-        row_vector = paddle.arange(0, maxlen, 1).unsqueeze(0).expand(
-            shape=(batch_size, maxlen)).reshape((batch_size, -1, maxlen))
+        row_vector = paddle.arange(
+            0, maxlen,
+            1).unsqueeze(0).expand(shape=(batch_size, maxlen)).reshape(
+                (batch_size, -1, maxlen))
         lengths = lengths.unsqueeze(-1)
         mask = row_vector < lengths
         return mask.astype(dtype)