fix code style

paddle_fl/reader/gru4rec_reader.py

@@ -2,6 +2,7 @@ import paddle.fluid as fluid
 import numpy as np
 import os
 
+
 class Gru4rec_Reader:
     def __init__(self):
         pass
@@ -21,7 +22,6 @@ class Gru4rec_Reader:
         res.set_lod([lod])
         return res
 
-
     def lod_reader(self, reader, place):
         def feed_reader():
             for data in reader():
@@ -33,12 +33,14 @@ class Gru4rec_Reader:
                 fe_data["src_wordseq"] = lod_src_wordseq
                 fe_data["dst_wordseq"] = lod_dst_wordseq
                 yield fe_data
+
         return feed_reader
 
     def sort_batch(self, reader, batch_size, sort_group_size, drop_last=False):
         """
         Create a batched reader.
         """
+
         def batch_reader():
             r = reader()
             b = []
@@ -66,11 +68,11 @@ class Gru4rec_Reader:
         # Batch size check
         batch_size = int(batch_size)
         if batch_size <= 0:
-            raise ValueError("batch_size should be a positive integeral value, "
-                         "but got batch_size={}".format(batch_size))
+            raise ValueError(
+                "batch_size should be a positive integeral value, "
+                "but got batch_size={}".format(batch_size))
         return batch_reader
 
-
     def reader_creator(self, file_dir):
         def reader():
             files = os.listdir(file_dir)
@@ -82,10 +84,12 @@ class Gru4rec_Reader:
                         src_seq = l[:len(l) - 1]
                         trg_seq = l[1:]
                         yield src_seq, trg_seq
+
         return reader
 
     def reader(self, file_dir, place, batch_size=5):
         """ prepare the English Pann Treebank (PTB) data """
         print("start constuct word dict")
-        reader = self.sort_batch(self.reader_creator(file_dir), batch_size, batch_size * 20)
+        reader = self.sort_batch(
+            self.reader_creator(file_dir), batch_size, batch_size * 20)
         return self.lod_reader(reader, place)