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Improved code style 

Signed-off-by: Jim Martens <github@2martens.de>
This commit is contained in:
Jim Martens 2017-07-12 09:35:45 +02:00
parent e1c54fd15b
commit 64fd37e53d
1 changed files with 174 additions and 186 deletions
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82
blatt8/src/blatt8/Apriori.java
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@ -1,24 +1,19 @@
package blatt8; package blatt8;
import java.io.BufferedReader; import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileReader; import java.io.FileReader;
import java.io.IOException; import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.HashMap;
import java.util.List; import java.util.List;
import java.util.Map;
import java.util.Random;
public class Apriori { public class Apriori {
static List<int[]> itemsets = new ArrayList<int[]>(); private static List<int[]> itemsets = new ArrayList<int[]>();
static float minSup = 0.01f; private static float minSup = 0.01f;
static String path = "transactions.txt"; private static String path = "transactions.txt";
static int numItems=0; private static int numItems = 0;
static int numTransactions=0; private static int numTransactions = 0;
private static void analyzeTransactionFile() { private static void analyzeTransactionFile() {
try (BufferedReader br = new BufferedReader(new FileReader(path))) { try (BufferedReader br = new BufferedReader(new FileReader(path))) {
@ -26,14 +21,13 @@ public class Apriori {
while ((line = br.readLine()) != null) { while ((line = br.readLine()) != null) {
numTransactions++; numTransactions++;
String[] products = line.split("\\s+"); String[] products = line.split("\\s+");
for(int i=0;i<products.length;i++){ for (String product : products) {
if(Integer.parseInt(products[i])+1>numItems){ if (Integer.parseInt(product) + 1 > numItems) {
numItems = Integer.parseInt(products[i])+1; numItems = Integer.parseInt(product) + 1;
} }
} }
} }
} } catch (IOException e) {
catch(IOException e){
e.printStackTrace(); e.printStackTrace();
} }
System.out.println("Num Transactions:" + numTransactions); System.out.println("Num Transactions:" + numTransactions);
@ -46,8 +40,7 @@ public class Apriori {
//Calculate L1 //Calculate L1
System.out.println(k + "-Itemsets"); System.out.println(k + "-Itemsets");
find_frequent_1_itemsets(); find_frequent_1_itemsets();
for (k=2;itemsets.size()>0;k++) for (k = 2; itemsets.size() > 0; k++) {
{
System.out.println("\n" + k + "-Itemsets"); System.out.println("\n" + k + "-Itemsets");
generateCandidates(); generateCandidates();
@ -59,26 +52,20 @@ public class Apriori {
private static void generateCandidates() { private static void generateCandidates() {
int k = itemsets.get(0).length + 1; int k = itemsets.get(0).length + 1;
List<int[]> candidates = new ArrayList<int[]>(); List<int[]> candidates = new ArrayList<int[]>();
for(int i=0; i<itemsets.size(); i++) for (int i = 0; i < itemsets.size(); i++) {
{ for (int[] itemset : itemsets) {
for(int j=0; j<itemsets.size(); j++)
{
int[] I1 = itemsets.get(i); int[] I1 = itemsets.get(i);
int[] I2 = itemsets.get(j);
boolean match = true; boolean match = true;
for (int l = 0; l < k - 2; l++) { for (int l = 0; l < k - 2; l++) {
if(I1[l]!=I2[l]){ if (I1[l] != itemset[l]) {
match = false; match = false;
continue;
} }
} }
if (match) { if (match) {
if(I1[k-2]<I2[k-2]){ if (I1[k - 2] < itemset[k - 2]) {
int[] c = new int[k]; int[] c = new int[k];
for(int l=0;l<k-1;l++){ System.arraycopy(I1, 0, c, 0, k - 1);
c[l]=I1[l]; c[k - 1] = itemset[k - 2];
}
c[k-1]=I2[k-2];
if (!prune(c)) { if (!prune(c)) {
candidates.add(c); candidates.add(c);
} }
@ -87,8 +74,11 @@ public class Apriori {
} }
} }
itemsets = new ArrayList<int[]>(candidates); itemsets = new ArrayList<int[]>(candidates);
if(itemsets.size()>0)System.out.println(itemsets.size()+" Candidates for k="+itemsets.get(0).length); if (itemsets.size() > 0) {
else System.out.println("0 Candidates"); System.out.println(itemsets.size() + " Candidates for k=" + itemsets.get(0).length);
} else {
System.out.println("0 Candidates");
}
} }
@ -119,10 +109,10 @@ public class Apriori {
} }
private static boolean contains(int[] a, int[] b) { private static boolean contains(int[] a, int[] b) {
for(int j=0;j<b.length;j++){ for (int aB : b) {
boolean match = false; boolean match = false;
for(int i=0;i<a.length;i++){ for (int anA : a) {
if(b[j]==a[i]){ if (aB == anA) {
match = true; match = true;
} }
} }
@ -142,8 +132,7 @@ public class Apriori {
private static void find_frequent_1_itemsets() { private static void find_frequent_1_itemsets() {
itemsets = new ArrayList<int[]>(); itemsets = new ArrayList<int[]>();
for(int i=0; i<numItems; i++) for (int i = 0; i < numItems; i++) {
{
int[] cand = {i}; int[] cand = {i};
itemsets.add(cand); itemsets.add(cand);
} }
@ -151,8 +140,7 @@ public class Apriori {
calculateFrequentItemsets(); calculateFrequentItemsets();
} }
private static void calculateFrequentItemsets() private static void calculateFrequentItemsets() {
{
List<int[]> frequent = new ArrayList<int[]>(); List<int[]> frequent = new ArrayList<int[]>();
int[] counter = new int[itemsets.size()]; int[] counter = new int[itemsets.size()];
try (BufferedReader br = new BufferedReader(new FileReader(path))) { try (BufferedReader br = new BufferedReader(new FileReader(path))) {
@ -169,8 +157,7 @@ public class Apriori {
} }
} }
} }
} } catch (IOException e) {
catch(IOException e){
e.printStackTrace(); e.printStackTrace();
} }
for (int i = 0; i < counter.length; i++) { for (int i = 0; i < counter.length; i++) {
@ -181,15 +168,18 @@ public class Apriori {
} }
} }
itemsets = frequent; itemsets = frequent;
if(itemsets.size()>0)System.out.println("Total Number Frequent "+itemsets.get(0).length+"-Itemsets: "+itemsets.size()); if (itemsets.size() > 0) {
else System.out.println("0 Frequent"); System.out.println("Total Number Frequent " + itemsets.get(0).length + "-Itemsets: " + itemsets.size());
} else {
System.out.println("0 Frequent");
}
} }
private static void printItemset(int[] is) { private static void printItemset(int[] is) {
String print=""; StringBuilder print = new StringBuilder();
for(int i=0;i<is.length;i++){ for (int i1 : is) {
print+=is[i]+" - "; print.append(i1).append(" - ");
} }
System.out.println(print); System.out.println(print);
} }
@ -198,8 +188,6 @@ public class Apriori {
public static void main(String[] args) { public static void main(String[] args) {
analyzeTransactionFile(); analyzeTransactionFile();
AprioriAlgorithm(); AprioriAlgorithm();
} }
} }