diff --git a/ELMo/LAC_demo/network.py b/ELMo/LAC_demo/network.py
index c982c2538b69e7cd7fcdf41485ee86330e552cd5..96471fa12b609a8cd728260c3f77a2f0f4dc29bc 100755
--- a/ELMo/LAC_demo/network.py
+++ b/ELMo/LAC_demo/network.py
@@ -9,6 +9,7 @@ import paddle.fluid as fluid
 from paddle.fluid.initializer import NormalInitializer
 import paddle.fluid.layers as layers
 from bilm import elmo_encoder
+import ipdb
 
 
 def lex_net(args, word_dict_len, label_dict_len):