我有兩個特徵和權重元素矩陣。我正在實現一個學習算法。我想更新arraylist的元素(用於表示一個特徵樣本的向量)。以下是代碼。但我的矩陣元素(矢量元素不)更新。我也提供了樣本解決方案。預計不會更新前後的相同值。請讓我知道代碼中的缺陷在哪裏?無法更新arrayList中的元素
for(int i =0 ; i< N ; i++){ //N is a large real number
ArrayList<Double> featureVector = new ArrayList<Double>();
featureVector = FeatureMatrix.get(i);
System.out.println("Before::"+ featureVector);
if(testList.contains(i)){
for(int j=0 ; j< testList.size(); j++){
if(i == testList.get(j)){
int indexInTestList= j;
List<Double> subListNextCandidate ;
subListNextCandidate = weightVectorNextCandidate.subList((10*indexIntTestList),((10)*(indexInTestList+1))); //clips a portion of member from long list of members
List<Double> approxWeight = new ArrayList<Double>();
approxWeight = getApproxWeight(FeatureVector, indexInTestList, FeatureMatrix,WeightMatrix, bias); //approxWeight is a vector of same dimension as of featureVector
for(int l=0 ; l< 10;l++){
double Update = featureVector.get(l)+ Rate*((subListCandidate.get(l)-approxWeight.get(l))-(lambda*featureVector.get(l)*(1/M)));//M is large real number
featureVector.set(l,Update);
}
}
}
}
else{
for(int l=0 ; l< 10;l++){
double Update = featureVector.get(l) -Rate*(lambda*featureVector.get(l)*(1/M));
featureVector.set(l, Update);
}
}
System.out.println("After:::"+ FeatureMatrix.get(i));
}
示例輸出::
Before::[0.04539928251182193, -0.16233604402485394, 0.905018369795912, -1.2817141994528614, 0.7065420460225843, -0.8946090188977665, -1.74892020689701, -2.1539901172158187, 1.8229765478806985, -1.8109945435256574]
After:::[0.04539928251182193, -0.16233604402485394, 0.905018369795912, -1.2817141994528614, 0.7065420460225843, -0.8946090188977665, -1.74892020689701, -2.1539901172158187, 1.8229765478806985, -1.8109945435256574]
您應該使用調試器並逐步執行代碼中的行。 – 2012-04-24 20:16:37
1.格式化您的代碼2.「testList」來自何處? (在您發佈的代碼中沒有初始化。) – aviad 2012-04-24 20:28:52
測試列表作爲方法的參數。 – thetna 2012-04-24 20:35:33