diff --git a/examples/paddle/sentiment_bilstm/config.py b/examples/paddle/sentiment_bilstm/config.py
index cdee7cdf9..cde30cf61 100644
--- a/examples/paddle/sentiment_bilstm/config.py
+++ b/examples/paddle/sentiment_bilstm/config.py
@@ -1,4 +1,5 @@
 from paddle.trainer.PyDataProvider2 import *
+from itertools import izip
 
 
 def get_features(doc):
@@ -8,6 +9,14 @@ def get_features(doc):
         dtype='int32')
 
 
+def read_data(data_dir):
+    for subdir, label in (('pos', 1), ('neg', 0)):
+        for filename in (data_dir / subdir).iterdir():
+            with filename.open() as file_:
+                text = file_.read()
+                yield text, label
+
+
 def on_init(settings, lang_name, **kwargs):
     print("Loading spaCy")
     nlp = spacy.load('en', entity=False)
@@ -28,8 +37,7 @@ def on_init(settings, lang_name, **kwargs):
 @provider(init_hook=on_init)
 def process(settings, data_dir):  # settings is not used currently.
     texts, labels = read_data(data_dir)
-    for doc, label in zip(nlp.pipe(train_texts, batch_size=5000, n_threads=3),
-                          labels):
+    for doc, label in izip(nlp.pipe(texts, batch_size=5000, n_threads=3), labels):
         for sent in doc.sents:
             ids = get_features(sent)
             # give data to paddle.