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collaborative_filter.c
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collaborative_filter.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define nameSize 100
typedef struct user {
char name[nameSize];
int* scores;
}USER;
//Kitaplarý okur.
void readBooks(FILE* stream, char** books, int bookNumber);
//Kullanýcýlarý okur.
void readUsers(FILE* stream, USER* users, int bookNumber);
//Dizideki kullanýcalarý ve verdiði skorlarý yazdýrýr.
void displayUsers(USER* users, int newUserSize, int bookNumber);
//2 Kullanýcý arasýndaki benzerlik bulunur. Benzerlik deðeri döner.
float sim(USER a, USER b, int bookNumber);
//1 NU nun bütün U lara benzerliðini ölçer. Düzgünce diziye yerleþtirir. User döner.
USER pearson(USER* users, USER* newUsers, int bookNumber, char name[nameSize], int userSize, int newUserSize, int k, float* simResults, int* simIndexes);
//Okuduðu kitaplar üzerinden ortalama döndürür.
float getAverageScore(USER u, int bookNumber);
//NU nun okumadýðý kitaplar için tahmini puanýný belirler.
void predict(USER* users, USER nu, char** books, int bookNumber, int k, float* simResults, int* simIndexes);
int main() {
int i = 0, j;
int exit = 0;
int menu; //Menu secimi
int bookNumber; //Kitap sayýsý
int userSize; //User sayýsý
int newUserSize; //New User sayýsý
float* simResults; //Benzerlik sonuçlarý
int* simIndexes; //Benzerlik sonuçlarýnýna sahip kullanýcýlarýn indexleri
FILE* stream = fopen("recdataset.csv", "r");
if (!stream) {
printf("File cannot openned.");
return 0;
}
fscanf(stream, "%d\n", &bookNumber);
fscanf(stream, "%d\n", &userSize);
fscanf(stream, "%d\n", &newUserSize);
char** books = (char**)calloc(bookNumber, sizeof(char*)); //Kitap isimleri
for (i = 0; i < bookNumber; i++) {
books[i] = (char*)calloc(nameSize, sizeof(char));
}
USER* users = (USER*)malloc(userSize * sizeof(USER)); //Userlerýn dizisi
USER* newUsers = (USER*)malloc(newUserSize * sizeof(USER)); //New userlarýn dizisi
readBooks(stream, books, bookNumber);
readUsers(stream, users, bookNumber);
readUsers(stream, newUsers, bookNumber);
printf("Users are read.\n");
while (!exit) {
printf("\n 1. Get Recomendation.\n 2. Display all recomendations for new users.\n 3.Display users.\n 4.Display new users.\n 5.Exit");
scanf("%d", &menu);
system("CLS");
if (menu == 1) {
char nu[nameSize];
int k;
printf("Enter new user name (like NU1) : ");
scanf("%s", nu);
printf("Enter similiar user number (k) : ");
scanf("%d", &k);
system("CLS");
simResults = (float*)calloc(k, sizeof(float));
simIndexes = (int*)calloc(k, sizeof(int));
USER u = pearson(users, newUsers, bookNumber, nu, userSize, newUserSize, k, simResults, simIndexes);
predict(users, u, books, bookNumber, k, simResults, simIndexes);
free(simIndexes);
free(simResults);
}
else if (menu==2){
for(i=0;i<newUserSize;i++){
printf("\n**********************************************\n");
simResults = (float*)calloc(3, sizeof(float));
simIndexes = (int*)calloc(3, sizeof(int));
USER u = pearson(users, newUsers, bookNumber, newUsers[i].name, userSize, newUserSize, 3, simResults, simIndexes);
predict(users, u, books, bookNumber, 3, simResults, simIndexes);
free(simIndexes);
free(simResults);
printf("\n**********************************************\n");
}
}
else if (menu == 3) {
displayUsers(users, userSize, bookNumber);
}
else if (menu == 4) {
displayUsers(newUsers, newUserSize, bookNumber);
}
else {
exit = 1;
}
}
return 0;
}
void predict(USER* users, USER nu, char** books, int bookNumber, int k, float* simResults, int* simIndexes) {
int i, j;
//New userýn ortalama skoru
float rnu = getAverageScore(nu, bookNumber);
//Denklemin pay kýsmý
float uTotal = 0.0;
//Denklemin payda kýsmý
float bTotal = 0.0;
//Tahmin
float prediction = 0.0;
//Maximum tahmin
float maxPrediction = 0.0;
//Önerilecek kitabýn indexi
int recommendedBook;
for (i = 0; i < bookNumber; i++) {
//NU nun okumadýðý kitaplarý seçiyoruz.
if (nu.scores[i] == 0) {
uTotal = 0.0;
bTotal = 0.0;
//O kitaplarý okuyan kullanýcýlar için denklemi gerçekleþtiriyoruz.
for (j = 0; j < k; j++) {
USER u = users[simIndexes[j]];
if(u.scores[i]!=0){
uTotal += simResults[j] * (u.scores[i] - (getAverageScore(u, bookNumber)));
bTotal += simResults[j];
}
}
//Tahmin sonucunu hesaplýyoruz.
prediction = rnu + (uTotal / bTotal);
printf("%s -> %f\n", books[i], prediction);
//Maximum skoru bulmak için
if(maxPrediction<prediction){
maxPrediction = prediction;
recommendedBook = i;
}
}
}
printf("\n Recommended book is %s", books[recommendedBook]);
}
float getAverageScore(USER u, int bookNumber) {
int i, j;
float avg = 0.0;
int counter = 0;
for (i = 0; i < bookNumber; i++) {
if(u.scores[i] != 0){
avg += u.scores[i];
counter++;
}
}
avg /= counter;
return avg;
}
USER pearson(USER* users, USER* newUsers, int bookNumber, char name[nameSize], int userSize, int newUserSize, int k, float* simResults, int* simIndexes) {
int i = 0, j;
//simResults dizisinin hangi indexine yerleþiceðini tutar.
int simLastIndex = 1;
//Verilen isimli kullanýcýyý bulur.
while (i < newUserSize && strcmp(name, newUsers[i].name)) {
i++;
}
if (i == newUserSize) {
printf("User not found.");
return;
}
else {
//NU nun ilk U ile benzerliði yerleþtirilir.
USER nu = newUsers[i];
simResults[0] = sim(nu, users[0], bookNumber);
simIndexes[0] = 0;
//Ýlk k kadar benzerlik alacaðýmýz için geri kalanlarý diziye almýyoruz.
for (i = 1; i < userSize; i++) {
// K kadar benzerlik daha ölçülmemiþse diziye direk alýnýr.
if (simLastIndex < k) {
simResults[simLastIndex] = sim(nu, users[i], bookNumber);
simIndexes[simLastIndex] = i;
}
//Diziye k kadar benzerlik alýnmýþsa ve sonuncu elemandan büyükse onun yerine eklenir.
else {
simLastIndex--;
if (simResults[simLastIndex] < sim(nu, users[i], bookNumber)) {
simResults[simLastIndex] = sim(nu, users[i], bookNumber);
simIndexes[simLastIndex] = i;
}
}
//Son hanedeki eleman öncekinden büyükse uygun yere gelene kadar swap iþlemi gerçekleþtirilir.
j = simLastIndex;
while (j > 0 && simResults[j] > simResults[j - 1]) {
//Sonuçlar swaplanýr.
float tmp = simResults[j];
simResults[j] = simResults[j - 1];
simResults[j - 1] = tmp;
//Userlarýn indexleri swaplanýr.
int temp = simIndexes[j];
simIndexes[j] = simIndexes[j - 1];
simIndexes[j - 1] = temp;
j--;
}
if (simLastIndex < k) {
simLastIndex++;
}
}
printf("Closest users for %s : \n", name);
for (i = 0; i < k; i++) {
printf(" %2d. %5s - %10f\n", i + 1, users[simIndexes[i]].name, simResults[i]);
}
return nu;
}
return;
}
float sim(USER a, USER b, int bookNumber) {
int i;
//A nýn ortalamasý ile B nin ortalamasý.
float ra = 0.0, rb = 0.0;
int counter = 0;
//Ortak okuduðu kitaplar üzerinden skor ortalamalarý hesaplandý.
for (i = 0; i < bookNumber; i++) {
if (a.scores[i] != 0 && b.scores[i] != 0) {
ra += a.scores[i];
rb += b.scores[i];
counter++;
}
}
ra /= counter;
rb /= counter;
float result = 0.0; //Genel sonuç
float uTotal = 0.0; //Denklemin pay kýsmý
float bTotal = 0.0; //Denklemin payda kýsmýnýn sol tarafý
float b2Total = 0.0;//Denklemin payda kýsmýnýn sað tarafý
for (i = 0; i < bookNumber; i++) {
if (a.scores[i] != 0 && b.scores[i] != 0) {
//Ortalamadan farklarý alýnýr.
float RA = a.scores[i] - ra;
float RB = b.scores[i] - rb;
//Ortalamadan farklarý çarpýlarak biriktirilir.
uTotal += (float)(RA * RB);
//Ortalamadan farklarýnýn kareleri ayrý ayrý biriktirilir.
bTotal += (float)(pow(RA, 2));
b2Total += (float)(pow(RB, 2));
}
}
//Payda kýsmýnýn sonucu hesaplanýr.
bTotal = sqrt(bTotal) * sqrt(b2Total);
//Genel sonuç hesaplanýr.
result = uTotal / bTotal;
return result;
}
void displayUsers(USER* users, int newUserSize, int bookNumber) {
int i, j;
for (i = 0; i < newUserSize; i++) {
printf(" %4s - ", users[i].name);
for (j = 0; j < bookNumber; j++) {
printf(" %d,", users[i].scores[j]);
}
printf("\n");
}
}
void readUsers(FILE* stream, USER* users, int bookNumber) {
int i = 0;
int userCounter = 0; //User dizisi için index tutar.
char line[1024];
//Satýrý alýr.
while (fgets(line, 1024, stream) && strcmp(line, ";;;;;;;;\n"))
{
USER u;
//Kitaplar için alan açar.
u.scores = (int*)calloc(bookNumber, sizeof(int));
char token[10] = "";
int bookCounter = 0;
i = 0;
//Kitap adýný token deðiþkenine alýr.
while (line[i] != ';') {
char tmp = line[i];
strncat(token, &tmp, 1);
i++;
}
i++;
//User yapýsýna ismini kaydederiz.
strcpy(u.name, token);
//Bütün kitaplarýna bakana kadar devam eder.
while (bookCounter < bookNumber) {
//Eðer art arda ;; konulmuþsa veya satýr sonundaysa buraya gelir.
if (line[i] == ';' || line[i] == '\n') {
u.scores[bookCounter] = 0;
}
// ; ; þeklindeyse buraya gelir.
else if (line[i] == ' ') {
u.scores[bookCounter] = 0;
i++;
}
// ;4; þeklindeyse buraya gelir.
else {
char tmp = line[i];
u.scores[bookCounter] = (int)tmp - 48;
i++;
}
i++;
bookCounter++;
}
//Users dizisinde biriktiririz.
users[userCounter] = u;
userCounter++;
}
}
void readBooks(FILE* stream, char** books, int bookNumber) {
int i = 0;
char line[1024];
fgets(line, 1024, stream);
char* token = strtok(line, ";");
token = strtok(NULL, ";");
while (token != NULL) {
strcpy(books[i], token);
if (i == bookNumber - 2) {
token = strtok(NULL, ";\n");
}
else {
token = strtok(NULL, ";");
}
i++;
}
}