/** 训练 */
public Linear train(InstanceSet trainingList, InstanceSet testList) {
int numSamples = trainingList.size();
count = 0;
for (int ii = 0; ii < trainingList.size(); ii++) {
Instance inst = trainingList.getInstance(ii);
count += ((int[]) inst.getTarget()).length;
}
System.out.println("Chars Number: " + count);
double oldErrorRate = Double.MAX_VALUE;
// 开始循环
long beginTime, endTime;
long beginTimeIter, endTimeIter;
beginTime = System.currentTimeMillis();
double pE = 0;
int iter = 0;
int frac = numSamples / 10;
while (iter++ < maxIter) {
if (!simpleOutput) {
System.out.print("iter:");
System.out.print(iter + "\t");
}
double err = 0;
double errorAll = 0;
beginTimeIter = System.currentTimeMillis();
int progress = frac;
for (int ii = 0; ii < numSamples; ii++) {
Instance inst = trainingList.getInstance(ii);
Results pred = (Results) msolver.getBest(inst, 1);
double l = loss.calc(pred.getPredAt(0), inst.getTarget());
if (l > 0) { // 预测错误，更新权重
errorAll += 1.0;
err += l;
update.update(inst, weights, pred.getPredAt(0), c);
} else {
if (pred.size() > 1) update.update(inst, weights, pred.getPredAt(1), c);
}
if (!simpleOutput && ii % progress == 0) { // 显示进度
System.out.print('.');
progress += frac;
}
}
double errRate = err / count;
endTimeIter = System.currentTimeMillis();
if (!simpleOutput) {
System.out.println("\ttime:" + (endTimeIter - beginTimeIter) / 1000.0 + "s");
System.out.print("Train:");
System.out.print("\tTag acc:");
}
System.out.print(1 - errRate);
if (!simpleOutput) {
System.out.print("\tSentence acc:");
System.out.print(1 - errorAll / numSamples);
System.out.println();
}
if (testList != null) {
test(testList);
}
if (Math.abs(errRate - oldErrorRate) < eps) {
System.out.println("Convergence!");
break;
}
oldErrorRate = errRate;
if (interim) {
Linear p = new Linear(msolver, trainingList.getAlphabetFactory());
try {
p.saveTo("tmp.model");
} catch (IOException e) {
System.err.println("write model error!");
}
}
if (isOptimized) { // 模型优化，去掉不显著的特征
int[] idx = MyArrays.getTop(weights.clone(), threshold, false);
System.out.print("Opt: weight numbers: " + MyArrays.countNoneZero(weights));
MyArrays.set(weights, idx, 0.0);
System.out.println(" -> " + MyArrays.countNoneZero(weights));
}
}
endTime = System.currentTimeMillis();
System.out.println("done!");
System.out.println("time escape:" + (endTime - beginTime) / 1000.0 + "s");
Linear p = new Linear(msolver, trainingList.getAlphabetFactory());
return p;
}