6.2.2 Feature selection
There are two general feature selection methods: incremental feature selection and feature
selection of based on frequency threshold. Appear relatively large frequency characteristic was
selected, the frequency is greater than a threshold value equal to a characterristick. Through
repeating them many times, the frequency threshold value was characterized k = 5, characterized in
that the use of the frequency characteristic is greater than 5.
Figure 2.
Feature
generate process
Feature：.......... Pos-1pos0 pos+1
adj n v B
(w0,pos0),
(pos0,tag0),
(w+1,pos+1
),
(pos0,pos+
1),
W-1=
,pos-1=adj,tag-1=O
W0=
,pos0=n,tag0=B
W+1=
,pos+1=v,tag+1=I
特征
生成
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