请问，感知机中文分词有7种状态特征，这7种是如何定义7这个数量的？

873101411 · March 23, 2020, 7:27am

请问，感知机中文分词有7种状态特征，这7种是如何定义7这个数量的？
如以/乡6 是X_t / X_t+1
以/乡7 是X_t+1 / X_t+2 这样组合吗
为何没有X_t / X_t+2这样的组合呢
含义是什么呢如上述例子中以/乡7
希望得到解答

hankcs · March 23, 2020, 11:29am

特征模板是人工经验的产物。

873101411 · March 23, 2020, 11:41am

谢解答
能否解释一下以/乡7 具体含义
感谢

hankcs · March 23, 2020, 11:53am

github.com

hankcs/HanLP/blob/48347f489316b19d75ef6a0ed8e2620a5b5de911/src/main/java/com/hankcs/hanlp/model/perceptron/instance/CWSInstance.java#L112




        sbFeature.delete(0, sbFeature.length());
        sbFeature.append(preChar).append("/").append(curChar).append('5');
        addFeature(sbFeature, featureVec, featureMap);


        sbFeature.delete(0, sbFeature.length());
        sbFeature.append(curChar).append("/").append(nextChar).append('6');
        addFeature(sbFeature, featureVec, featureMap);


        sbFeature.delete(0, sbFeature.length());
        sbFeature.append(nextChar).append("/").append(next2Char).append('7');
        addFeature(sbFeature, featureVec, featureMap);


//        sbFeature.delete(0, sbFeature.length());
//        sbFeature.append("B[-2,0]=").append(pre2Char).append("/").append(curChar);
//        addFeature(sbFeature, featureVec, featureMap);
//
//        sbFeature.delete(0, sbFeature.length());
//        sbFeature.append("B[-1,1]=").append(preChar).append("/").append(nextChar);
//        addFeature(sbFeature, featureVec, featureMap);
//

873101411 · March 23, 2020, 12:06pm

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