Java TIntFloatIterator类代码示例

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
private boolean oneStepStatistic(Instance inst) {
	if(inst==null)
		return false;
	int[] type;
	Object t=inst.getTarget();
	if(t instanceof Integer){
		type=new int[1];
		type[0]=Integer.parseInt(t.toString());
	}
	else{
		return false;
	}
	
	HashSparseVector data = (HashSparseVector) inst.getData();
	TIntFloatIterator it = data.data.iterator();
	while (it.hasNext()) {
		it.advance();
		int feature=it.key();
		for(int i=0;i<type.length;i++){
			addItemFrequency(feature, type[i], (int)it.value());
		}
	}
	
	return true;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
private float distanceEuclidean(int n, HashSparseVector sv, float baseDistance) {
    HashSparseVector center = classCenter.get(n);
    int count = classCount.get(n);
    float dist = baseDistance / (count * count);
    TIntFloatHashMap data = center.data;
    TIntFloatIterator it = sv.data.iterator();
    while (it.hasNext()) {
        it.advance();
        int key = it.key();
        if (!data.containsKey(key)) {
            dist += it.value() * it.value();
        }
        else {
            float temp = data.get(key) / count;
            dist -= temp * temp;
            dist += (it.value() - temp) * (it.value() - temp);
        }
    }
    return dist;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
private void updateBaseDist(int classid, HashSparseVector vector) {
    float base = baseDistList.get(classid);
    TIntFloatHashMap center = classCenter.get(classid).data;
    TIntFloatIterator it =  vector.data.iterator();
    while (it.hasNext()) {
        it.advance();
        if (!center.containsKey(it.key())) {
            base += it.value() * it.value();
        }
        else {
            float temp = center.get(it.key());
            base -= temp * temp;
            base += (it.value() - temp) * (it.value() - temp);
        }
    }
    baseDistList.set(classid, base);
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
/**
 * 由大到小排序
 * @param tmap
 * @return 数组下标
 */
public static int[] sort(TIntFloatHashMap tmap) {
	HashMap<Integer, Float> map = new HashMap<Integer, Float>();

	TIntFloatIterator it = tmap.iterator();
	while (it.hasNext()) {
		it.advance();
		int id = it.key();
		float val = it.value();
		map.put(id, Math.abs(val));
	}
	it = null;

	List<Entry> list = sort(map);
	int[] idx = new int[list.size()];
	Iterator<Entry> it1 = list.iterator();
	int i=0;
	while (it1.hasNext()) {
		Entry entry = it1.next();
		idx[i++] = (Integer) entry.getKey();
	}
	return idx;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
public double compare(
		TIntFloatMap v1,
		TIntFloatMap v2,
		boolean sorted) 
{
	//it does not matter if the vectors are sorted or not
	
	double DKL = 0.0;

               TIntFloatIterator iter = v1.iterator();
               while (iter.hasNext())
               {
                   iter.advance();
                   int key = iter.key();
                   if (!v2.containsKey(key))
                   {
                       continue;
                   }
                   double P = iter.value();
                   double Q = v2.get(key);
                   DKL += Math.log(P/Q) * P;
               }

	return DKL;

}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
public static int[] getSortedIndices(TIntFloatMap vector)
{
    // NOTE: it's probably possible to do this using purely primitive
    // operations without having to resort to pushing things into an
    // Index[].  However, this code is much cleaner to have and since we
    // sort at most once per vector and the result is memoized, we don't
    // lose too much from the Object-based sorting.
    Index[] keyValPairs = new Index[vector.size()];
    TIntFloatIterator iter = vector.iterator();
    int i = 0;
    while (iter.hasNext())
    {
            iter.advance();
            keyValPairs[i++] = new Index(iter.key(), iter.value());
    }

    Arrays.sort(keyValPairs);
    int[] sortedIndices = new int[keyValPairs.length];
    for (i = 0; i < keyValPairs.length; ++i)
        sortedIndices[i] = keyValPairs[i].key;
    
    return sortedIndices;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
/**
 * Normalizes the probability values in a vector so that to sum to 1.0
 * @param vector
 * @return
 */
public static TIntFloatMap normalizeVector(TIntFloatMap vector)
{
	float total = 0;

               TFloatIterator iter = vector.valueCollection().iterator();
               while (iter.hasNext())
                      total += iter.next();
               
               TIntFloatMap normalized = new TIntFloatHashMap(vector.size());
	
               TIntFloatIterator iter2 = vector.iterator();
               while (iter2.hasNext())
               {
                       iter2.advance();
                       normalized.put(iter2.key(), iter2.value() / total);
               }		
	return normalized;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
/**
 * 一次性统计概率，节约时间
 */
private void statisticProb() {
	System.out.println("统计概率");
	float totalword = alpahbet.size();
	TIntFloatIterator it = wordProb.iterator();
	while(it.hasNext()){
		it.advance();
		float v = it.value()/totalword;
		it.setValue(v);
		Cluster cluster = new Cluster(it.key(),v,alpahbet.lookupString(it.key()));
		clusters.put(it.key(), cluster);
	}

	TIntObjectIterator<TIntFloatHashMap> it1 = pcc.iterator();
	while(it1.hasNext()){
		it1.advance();
		TIntFloatHashMap map = it1.value();
		TIntFloatIterator it2 = map.iterator();
		while(it2.hasNext()){
			it2.advance();
			it2.setValue(it2.value()/totalword);
		}
	}

}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
/**
 * 由大到小排序
 * @param map
 * @return 数组下标
 */
public static int[] sort(TIntFloatHashMap tmap) {
	HashMap<Integer, Float> map = new HashMap<Integer, Float>();

	TIntFloatIterator it = tmap.iterator();
	while (it.hasNext()) {
		it.advance();
		int id = it.key();
		float val = it.value();
		map.put(id, Math.abs(val));
	}
	it = null;

	List<Entry> list = sort(map);
	int[] idx = new int[list.size()];
	Iterator<Entry> it1 = list.iterator();
	int i=0;
	while (it1.hasNext()) {
		Entry entry = it1.next();
		idx[i++] = (Integer) entry.getKey();
	}
	return idx;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
public HashSparseVector select(HashSparseVector vec){
	HashSparseVector sv=new HashSparseVector();		
	TIntFloatIterator it=vec.data.iterator();
	while(it.hasNext()){
		it.advance();
		if(isUseful[it.key()])
			sv.put(it.key(), it.value());
	}
	return sv;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
@Override
public float dotProduct(float[] vector) {
	float v =0f;
	TIntFloatIterator it = data.iterator();			
	while(it.hasNext()){
		it.advance();
		v += vector[it.key()]*it.value();
	}
	return v;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
public float l2Norm2() {
	TIntFloatIterator it = data.iterator();
	float norm = 0f;
	while(it.hasNext()){
		it.advance();
		norm += it.value()*it.value();
	}
	return norm;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
/**
 * 
 * @param c
 */
public void scaleDivide(float c) {
	TIntFloatIterator it = data.iterator();
	while(it.hasNext()){
		it.advance();
		float v = it.value()/c;
		data.put(it.key(), v);
	}

}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
/**
 * 欧氏距离
 * @param sv1
 * @param sv2
 * @return
 */
public static float distanceEuclidean(HashSparseVector sv1 ,HashSparseVector sv2) {
	float dist = 0.0f;
	TIntFloatIterator it1 = sv1.data.iterator();
	TIntFloatIterator it2 = sv2.data.iterator();
	int increa = 0;
	while(it1.hasNext()&&it2.hasNext()){
		if(increa==0){
			it1.advance();
			it2.advance();
		}else if(increa==1){
			it1.advance();
		}else if(increa==2){
			it2.advance();
		}
		if(it1.key()<it2.key()){
			dist += it1.value()*it1.value();
			increa = 1;
		}else if(it1.key()>it2.key()){
			dist += it2.value()*it2.value();
			increa = 2;
		}else{
			float t = it1.value() - it2.value();
			dist += t*t;
			increa = 0;
		}
	}
	while(it1.hasNext()){
		it1.advance();
		dist += it1.value()*it1.value();			
	}
	while(it2.hasNext()){
		it2.advance();
		dist += it2.value()*it2.value();

	}
	return dist;
}
 

import gnu.trove.iterator.TIntFloatIterator; //导入依赖的package包/类
public String toString(){
	StringBuilder sb = new StringBuilder();
	TIntFloatIterator it = data.iterator();
	while(it.hasNext()){
		it.advance();
		sb.append(it.key());
		sb.append(":");
		sb.append(it.value());
		if(it.hasNext())
			sb.append(", ");
	}
	return sb.toString();
}