Correct model average settings in crf

demo/sequence_tagging/linear_crf.py

@@ -27,7 +27,7 @@ settings(
     learning_method=MomentumOptimizer(),
     batch_size=batch_size,
     regularization=L2Regularization(batch_size * 1e-4),
-    average_window=0.5,
+    model_average=ModelAverage(0.5),
     learning_rate=1e-1,
     learning_rate_decay_a=1e-5,
     learning_rate_decay_b=0.25, )

demo/sequence_tagging/rnn_crf.py

@@ -27,7 +27,7 @@ settings(
     learning_method=MomentumOptimizer(),
     batch_size=batch_size,
     regularization=L2Regularization(batch_size * 1e-5),
-    average_window=0.5,
+    model_average=ModelAverage(0.5),
     learning_rate=2e-3,
     learning_rate_decay_a=5e-7,
     learning_rate_decay_b=0.5, )