public static void main(String[] args) throws Exception {
// 建立字典管理器
AlphabetFactory af = AlphabetFactory.buildFactory();
// 使用n元特征
Pipe ngrampp = new NGram(new int[] {2, 3});
// 将字符特征转换成字典索引
Pipe indexpp = new StringArray2IndexArray(af);
// 将目标值对应的索引号作为类别
Pipe targetpp = new Target2Label(af.DefaultLabelAlphabet());
// 建立pipe组合
SeriesPipes pp = new SeriesPipes(new Pipe[] {ngrampp, targetpp, indexpp});
InstanceSet instset = new InstanceSet(pp, af);
// 用不同的Reader读取相应格式的文件
Reader reader = new FileReader(trainDataPath, "UTF-8", ".data");
// 读入数据，并进行数据处理
instset.loadThruStagePipes(reader);
float percent = 0.8f;
// 将数据集分为训练是和测试集
InstanceSet[] splitsets = instset.split(percent);
InstanceSet trainset = splitsets[0];
InstanceSet testset = splitsets[1];
/** 建立分类器 */
OnlineTrainer trainer = new OnlineTrainer(af);
Linear pclassifier = trainer.train(trainset);
pp.removeTargetPipe();
pclassifier.setPipe(pp);
af.setStopIncrement(true);
// 将分类器保存到模型文件
pclassifier.saveTo(modelFile);
pclassifier = null;
// 从模型文件读入分类器
Linear cl = Linear.loadFrom(modelFile);
// 性能评测
Evaluation eval = new Evaluation(testset);
eval.eval(cl, 1);
/** 测试 */
System.out.println("类别 : 文本内容");
System.out.println("===================");
for (int i = 0; i < testset.size(); i++) {
Instance data = testset.getInstance(i);
Integer gold = (Integer) data.getTarget();
String pred_label = cl.getStringLabel(data);
String gold_label = cl.getLabel(gold);
if (pred_label.equals(gold_label))
System.out.println(pred_label + " : " + testset.getInstance(i).getSource());
else
System.err.println(
gold_label + "->" + pred_label + " : " + testset.getInstance(i).getSource());
}
/** 分类器使用 */
String str = "韦德：不拿冠军就是失败 詹皇：没拿也不意味失败";
System.out.println("============\n分类：" + str);
Pipe p = cl.getPipe();
Instance inst = new Instance(str);
try {
// 特征转换
p.addThruPipe(inst);
} catch (Exception e) {
e.printStackTrace();
}
String res = cl.getStringLabel(inst);
System.out.println("类别：" + res);
// 清除模型文件
(new File(modelFile)).deleteOnExit();
// System.exit(0);
}
public static void main(String[] args) throws Exception {
// 分词
Pipe removepp = new RemoveWords();
CWSTagger tag = new CWSTagger("../models/seg.m");
Pipe segpp = new CNPipe(tag);
Pipe s2spp = new Strings2StringArray();
/** Bayes */
// 建立字典管理器
AlphabetFactory af = AlphabetFactory.buildFactory();
// 使用n元特征
Pipe ngrampp = new NGram(new int[] {2, 3});
// 将字符特征转换成字典索引;
Pipe sparsepp = new StringArray2SV(af);
// 将目标值对应的索引号作为类别
Pipe targetpp = new Target2Label(af.DefaultLabelAlphabet());
// 建立pipe组合
SeriesPipes pp = new SeriesPipes(new Pipe[] {removepp, segpp, s2spp, targetpp, sparsepp});
System.out.print("\nReading data......\n");
InstanceSet instset = new InstanceSet(pp, af);
Reader reader = new MyDocumentReader(trainDataPath, "gbk");
instset.loadThruStagePipes(reader);
System.out.print("..Reading data complete\n");
// 将数据集分为训练是和测试集
System.out.print("Sspliting....");
float percent = 0.8f;
InstanceSet[] splitsets = instset.split(percent);
InstanceSet trainset = splitsets[0];
InstanceSet testset = splitsets[1];
System.out.print("..Spliting complete!\n");
System.out.print("Training...\n");
af.setStopIncrement(true);
BayesTrainer trainer = new BayesTrainer();
BayesClassifier classifier = (BayesClassifier) trainer.train(trainset);
System.out.print("..Training complete!\n");
System.out.print("Saving model...\n");
classifier.saveTo(bayesModelFile);
classifier = null;
System.out.print("..Saving model complete!\n");
/** 测试 */
System.out.print("Loading model...\n");
BayesClassifier bayes;
bayes = BayesClassifier.loadFrom(bayesModelFile);
System.out.print("..Loading model complete!\n");
System.out.println("Testing Bayes...");
int flag = 0;
float[] percents_cs = new float[] {1.0f, 0.9f, 0.8f, 0.7f, 0.5f, 0.3f, 0.2f, 0.1f};
int[] counts_cs = new int[10];
for (int test = 0; test < percents_cs.length; test++) {
System.out.println("Testing Bayes" + percents_cs[test] + "...");
if (test != 0) bayes.fS_CS(percents_cs[test]);
int count = 0;
for (int i = 0; i < testset.size(); i++) {
Instance data = testset.getInstance(i);
Integer gold = (Integer) data.getTarget();
Predict<String> pres = bayes.classify(data, Type.STRING, 3);
String pred_label = pres.getLabel();
String gold_label = bayes.getLabel(gold);
if (pred_label.equals(gold_label)) {
count++;
} else {
flag = i;
// System.err.println(gold_label+"->"+pred_label+" :
// "+testset.getInstance(i).getTempData());
// for(int j=0;j<3;j++)
// System.out.println(pres.getLabel(j)+":"+pres.getScore(j));
}
}
counts_cs[test] = count;
System.out.println(
"Bayes Precision("
+ percents_cs[test]
+ "):"
+ ((float) count / testset.size())
+ "("
+ count
+ "/"
+ testset.size()
+ ")");
}
bayes.noFeatureSelection();
float[] percents_csmax = new float[] {1.0f, 0.9f, 0.8f, 0.7f, 0.5f, 0.3f, 0.2f, 0.1f};
int[] counts_csmax = new int[10];
for (int test = 0; test < percents_csmax.length; test++) {
System.out.println("Testing Bayes" + percents_csmax[test] + "...");
if (test != 0) bayes.fS_CS_Max(percents_csmax[test]);
int count = 0;
for (int i = 0; i < testset.size(); i++) {
Instance data = testset.getInstance(i);
Integer gold = (Integer) data.getTarget();
Predict<String> pres = bayes.classify(data, Type.STRING, 3);
String pred_label = pres.getLabel();
String gold_label = bayes.getLabel(gold);
if (pred_label.equals(gold_label)) {
count++;
} else {
// System.err.println(gold_label+"->"+pred_label+" :
// "+testset.getInstance(i).getTempData());
// for(int j=0;j<3;j++)
// System.out.println(pres.getLabel(j)+":"+pres.getScore(j));
}
}
counts_csmax[test] = count;
System.out.println(
"Bayes Precision("
+ percents_csmax[test]
+ "):"
+ ((float) count / testset.size())
+ "("
+ count
+ "/"
+ testset.size()
+ ")");
}
bayes.noFeatureSelection();
float[] percents_ig = new float[] {1.0f, 0.9f, 0.8f, 0.7f, 0.5f, 0.3f, 0.2f, 0.1f};
int[] counts_ig = new int[10];
for (int test = 0; test < percents_ig.length; test++) {
System.out.println("Testing Bayes" + percents_ig[test] + "...");
if (test != 0) bayes.fS_IG(percents_ig[test]);
int count = 0;
for (int i = 0; i < testset.size(); i++) {
Instance data = testset.getInstance(i);
Integer gold = (Integer) data.getTarget();
Predict<String> pres = bayes.classify(data, Type.STRING, 3);
String pred_label = pres.getLabel();
String gold_label = bayes.getLabel(gold);
if (pred_label.equals(gold_label)) {
count++;
} else {
// System.err.println(gold_label+"->"+pred_label+" :
// "+testset.getInstance(i).getTempData());
// for(int j=0;j<3;j++)
// System.out.println(pres.getLabel(j)+":"+pres.getScore(j));
}
}
counts_ig[test] = count;
System.out.println(
"Bayes Precision("
+ percents_csmax[test]
+ "):"
+ ((float) count / testset.size())
+ "("
+ count
+ "/"
+ testset.size()
+ ")");
}
System.out.println("..Testing Bayes complete!");
for (int i = 0; i < percents_cs.length; i++)
System.out.println(
"Bayes Precision CS("
+ percents_cs[i]
+ "):"
+ ((float) counts_cs[i] / testset.size())
+ "("
+ counts_cs[i]
+ "/"
+ testset.size()
+ ")");
for (int i = 0; i < percents_csmax.length; i++)
System.out.println(
"Bayes Precision CS_Max("
+ percents_csmax[i]
+ "):"
+ ((float) counts_csmax[i] / testset.size())
+ "("
+ counts_csmax[i]
+ "/"
+ testset.size()
+ ")");
for (int i = 0; i < percents_ig.length; i++)
System.out.println(
"Bayes Precision IG("
+ percents_ig[i]
+ "):"
+ ((float) counts_ig[i] / testset.size())
+ "("
+ counts_ig[i]
+ "/"
+ testset.size()
+ ")");
}