Merge pull request #227 from PaddlePaddle/fix_rec

Fix error in recom sys

recommender_system/README.en.md

@@ -87,6 +87,7 @@ The raw `MoiveLens` contains movie ratings, relevant features from both movies a
 For instance, one movie's feature could be:
 
 ```python
+import paddle.v2 as paddle
 movie_info = paddle.dataset.movielens.movie_info()
 print movie_info.values()[0]
 ```

recommender_system/index.en.html

@@ -129,6 +129,7 @@ The raw `MoiveLens` contains movie ratings, relevant features from both movies a
 For instance, one movie's feature could be:
 
 ```python
+import paddle.v2 as paddle
 movie_info = paddle.dataset.movielens.movie_info()
 print movie_info.values()[0]
 ```