diff --git a/demo/sentiment/trainer_config.py b/demo/sentiment/trainer_config.py
index 2defecd1782629..54c3dddee80ecc 100644
--- a/demo/sentiment/trainer_config.py
+++ b/demo/sentiment/trainer_config.py
@@ -29,7 +29,6 @@
     batch_size=128,
     learning_rate=2e-3,
     learning_method=AdamOptimizer(),
-    average_window=0.5,
     regularization=L2Regularization(8e-4),
     gradient_clipping_threshold=25)