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Table 9: 
Ablation tests on the development set (%). Minus (−) indicates percentage decrease.
MethodAccuracyΔ
DSW ++ 51.4 − 
− dialogue structure 50.0 −1.4 
− CE 46.7 −4.7 
GBDT ++ 53.3 − 
− bag of words 51.6 −1.7 
− rule-based features 51.2 −2.1 
− matching position 53.0 −0.3 
− dialogue structure 51.9 −1.4 
− PMI 51.4 −1.9 
− CR 52.7 −0.6 
− CE 52.7 −0.6 
− PMI, CR, CE 47.1 −6.2 
FTLM ++ 57.6 − 
− speaker embedding 55.9 −1.7 
− LM pre-training 36.2 −21.4 
MethodAccuracyΔ
DSW ++ 51.4 − 
− dialogue structure 50.0 −1.4 
− CE 46.7 −4.7 
GBDT ++ 53.3 − 
− bag of words 51.6 −1.7 
− rule-based features 51.2 −2.1 
− matching position 53.0 −0.3 
− dialogue structure 51.9 −1.4 
− PMI 51.4 −1.9 
− CR 52.7 −0.6 
− CE 52.7 −0.6 
− PMI, CR, CE 47.1 −6.2 
FTLM ++ 57.6 − 
− speaker embedding 55.9 −1.7 
− LM pre-training 36.2 −21.4 
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