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Eclat.cpp
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Eclat.cpp
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#include "Eclat.h"
using namespace std;
Eclat::~Eclat() {
}
Eclat::Eclat(bitset<MAX_ITEM_LEN> input[], int line_ans, double sup) {
min_sup = sup;
ans = line_ans;
for(int i = 0; i < line_ans; i ++) {
for(int j = 0; j < MAX_ITEM_LEN; j ++) {
if(input[i].test(j)) {
inverted_list[j].set(i);
}
}
}
printf("gen inverted list done\n");
}
void Eclat::genL1() {
for(int i = 0; i < MAX_ITEM_LEN; i ++) {
if((double)(inverted_list[i].count()) / ans >= min_sup) {
bitset<MAX_ITEM_LEN> tmp;
tmp.set(i);
L1_item.push_back(tmp);
L1_index.push_back(inverted_list[i]);
}
}
//printf("num: 1 , size: %d\n", L1_item.size());
}
void Eclat::genFreq(vector<bitset<MAX_ITEM_LEN>> L_item, vector<bitset<MAX_INPUT_LINE>> L_index, int num) {
if(L_item.size() == 0) {
return;
}
vector<bitset<MAX_ITEM_LEN>> Lk_item;
vector<bitset<MAX_INPUT_LINE>> Lk_index;
int tot = L_item.size();
printf("num: %d , size: %d\n", num - 1, tot);
vector<bitset<MAX_ITEM_LEN>> freq_exist;
for (int i = 0; i < tot; i ++) {
for (int j = i + 1; j < tot; j ++) {
bitset<MAX_ITEM_LEN> tmp_item;
bitset<MAX_INPUT_LINE> tmp_index;
for(int k = 0; k < MAX_ITEM_LEN; k ++) {
if(L_item[i].test(k) || L_item[j].test(k)) {
tmp_item.set(k);
}
}
if (tmp_item.count() != num || find(freq_exist.begin(), freq_exist.end(), tmp_item) != freq_exist.end()) {
continue;
}
freq_exist.push_back(tmp_item);
int sup = 0;
for(int k = 0; k < MAX_INPUT_LINE; k ++) {
if(L_index[i].test(k) && L_index[j].test(k)) {
sup ++;
tmp_index.set(k);
}
}
if((double)(sup) / ans >= min_sup) {
Lk_item.push_back(tmp_item);
Lk_index.push_back(tmp_index);
}
}
}
genFreq(Lk_item, Lk_index, num + 1);
}
void Eclat::getResult() {
genL1();
//printf("gen L1 done\n");
genFreq(L1_item, L1_index, 2);
}