diff --git a/06.understand_sentiment/train_conv.py b/06.understand_sentiment/train_conv.py
index ee613975607740e29c045ef3746d3bffd4904442..dfee8d7698863f7a8b21096fdc2d387d380d9c3c 100644
--- a/06.understand_sentiment/train_conv.py
+++ b/06.understand_sentiment/train_conv.py
@@ -14,6 +14,10 @@
 
 from __future__ import print_function
 
+import time
+start = time.time()
+
+
 import os
 import paddle
 import paddle.fluid as fluid
@@ -133,8 +137,16 @@ def infer(use_cuda, inference_program, params_dirname=None):
     # Note that lod info should be a list of lists.
 
     reviews_str = [
-        'read the book forget the movie', 'this is a great movie',
-        'this is very bad'
+        'read the book forget the movie',
+        'this is a great movie',
+        'this is very bad',
+        'the movie makes me sick',
+        'you can never find a worse movie',
+        'what a masterpiece',
+        'it deserves any compliment',
+        'no movie this year could be better than this one',
+        'i would rather die',
+        'the movie should be burned in hell'
     ]
     reviews = [c.split() for c in reviews_str]
 
@@ -157,10 +169,16 @@ def main(use_cuda):
     if use_cuda and not fluid.core.is_compiled_with_cuda():
         return
     params_dirname = "understand_sentiment_conv.inference.model"
+    import pdb;pdb.set_trace()
     train(use_cuda, train_program, params_dirname)
     infer(use_cuda, inference_program, params_dirname)
 
+    finish = time.time()
+    elapsed = finish - start
+    print(elapsed)
+
 
 if __name__ == '__main__':
     use_cuda = False # set to True if training with GPU
     main(use_cuda)
+
diff --git a/06.understand_sentiment/train_dyn_rnn.py b/06.understand_sentiment/train_dyn_rnn.py
index e8d2690452b691c3b00eabf3ffdee078ddb8876c..5b32857f3562cbe7eabec04e02fb0c4354518338 100644
--- a/06.understand_sentiment/train_dyn_rnn.py
+++ b/06.understand_sentiment/train_dyn_rnn.py
@@ -14,6 +14,9 @@
 
 from __future__ import print_function
 
+import time
+start = time.time()
+
 import os
 import paddle
 import paddle.fluid as fluid
@@ -123,7 +126,7 @@ def train(use_cuda, train_program, params_dirname):
             trainer.save_params(params_dirname)
 
     trainer.train(
-        num_epochs=1,
+        num_epochs=2,
         event_handler=event_handler,
         reader=train_reader,
         feed_order=feed_order)
@@ -150,8 +153,16 @@ def infer(use_cuda, inference_program, params_dirname=None):
     # Note that lod info should be a list of lists.
 
     reviews_str = [
-        'read the book forget the movie', 'this is a great movie',
-        'this is very bad'
+        'read the book forget the movie',
+        'this is a great movie',
+        'this is very bad',
+        'the movie makes me sick',
+        'you can never find a worse movie',
+        'what a masterpiece',
+        'it deserves any compliment',
+        'no movie this year could be better than this one',
+        'i would rather die',
+        'the movie should be burned in hell'
     ]
     reviews = [c.split() for c in reviews_str]
 
@@ -177,6 +188,9 @@ def main(use_cuda):
     train(use_cuda, train_program, params_dirname)
     infer(use_cuda, inference_program, params_dirname)
 
+    finish = time.time()
+    elapsed = finish - start
+    print(elapsed)
 
 if __name__ == '__main__':
     use_cuda = False # set to True if training with GPU
diff --git a/06.understand_sentiment/train_stacked_lstm.py b/06.understand_sentiment/train_stacked_lstm.py
index 708c4851eeba4b37b675b4ba196ffbf3524b7eb3..28bd2848ef9ac05584f683f71aab2de25f5e39ef 100644
--- a/06.understand_sentiment/train_stacked_lstm.py
+++ b/06.understand_sentiment/train_stacked_lstm.py
@@ -14,6 +14,9 @@
 
 from __future__ import print_function
 
+import time
+start = time.time()
+
 import os
 import paddle
 import paddle.fluid as fluid
@@ -114,7 +117,7 @@ def train(use_cuda, train_program, params_dirname):
             trainer.save_params(params_dirname)
 
     trainer.train(
-        num_epochs=1,
+        num_epochs=4,
         event_handler=event_handler,
         reader=train_reader,
         feed_order=feed_order)
@@ -141,8 +144,16 @@ def infer(use_cuda, inference_program, params_dirname=None):
     # Note that lod info should be a list of lists.
 
     reviews_str = [
-        'read the book forget the movie', 'this is a great movie',
-        'this is very bad'
+        'read the book forget the movie',
+        'this is a great movie',
+        'this is very bad',
+        'the movie makes me sick',
+        'you can never find a worse movie',
+        'what a masterpiece',
+        'it deserves any compliment',
+        'no movie this year could be better than this one',
+        'i would rather die',
+        'the movie should be burned in hell'
     ]
     reviews = [c.split() for c in reviews_str]
 
@@ -168,6 +179,9 @@ def main(use_cuda):
     train(use_cuda, train_program, params_dirname)
     infer(use_cuda, inference_program, params_dirname)
 
+    finish = time.time()
+    elapsed = finish - start
+    print(elapsed)
 
 if __name__ == '__main__':
     use_cuda = False # set to True if training with GPU