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java 推荐算法

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刘亚鹏
2020-07-31 17:40:44 +08:00
parent 24a8ae701d
commit e6979c08d8
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60
pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.tarzan</groupId>
<artifactId>recommend</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>recommend_system</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.16.1</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

13
src/main/java/com/tarzan/recommend/RecommendSystemApplication.java Normal file
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package com.tarzan.recommend;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class RecommendSystemApplication {
public static void main(String[] args) {
SpringApplication.run(RecommendSystemApplication.class, args);
}
}

122
src/main/java/com/tarzan/recommend/Service/FileDataSource.java Normal file
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package com.tarzan.recommend.Service;
import com.tarzan.recommend.dto.ItemDTO;
import com.tarzan.recommend.dto.RelateDTO;
import com.tarzan.recommend.dto.UserDTO;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.assertj.core.util.Lists;
import org.springframework.util.ResourceUtils;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.List;
@Data
@Slf4j
public class FileDataSource {
public final static String folderPath="F:\\ml-100k";
/**
* 方法描述: 读取基础数据
*
* @param
* @Return {@link List< RelateDTO>}
* @throws
* @author tarzan
* @date 2020年07月31日 16:53:40
*/
public static List<RelateDTO> getData() {
List<RelateDTO> relateList = Lists.newArrayList();
try {
FileInputStream out = new FileInputStream(folderPath+"\\u.data");
InputStreamReader reader = new InputStreamReader(out, StandardCharsets.UTF_8);
BufferedReader in = new BufferedReader(reader);
String line = null;
while ((line = in.readLine()) != null) {
String newline = line.replaceAll("[\t]", " ");
String[] ht = newline.split(" ");
Integer userId = Integer.parseInt(ht[0]);
Integer movieId = Integer.parseInt(ht[1]);
Integer rating = Integer.parseInt(ht[2]);
RelateDTO dto = new RelateDTO(userId, movieId, rating);
relateList.add(dto);
}
} catch (IOException e) {
log.error(e.getMessage());
}
return relateList;
}
/**
* 方法描述: 读取用户数据
*
* @param
* @Return {@link List< UserDTO>}
* @throws
* @author tarzan
* @date 2020年07月31日 16:54:51
*/
public static List<UserDTO> getUserData() {
List<UserDTO> userList = Lists.newArrayList();
try {
FileInputStream out = new FileInputStream(folderPath+"\\u.user");
InputStreamReader reader = new InputStreamReader(out, StandardCharsets.UTF_8);
BufferedReader in = new BufferedReader(reader);
String line = null;
while ((line = in.readLine()) != null) {
String newline = line.replaceAll("[\t]", " ");
String[] ht = newline.split("\\|");
Integer id = Integer.parseInt(ht[0]);
Integer age = Integer.parseInt(ht[1]);
String sex = ht[2];
String profession = ht[3];
String postcode = ht[4];
UserDTO dto = new UserDTO(id, age, sex, profession, postcode);
userList.add(dto);
}
} catch (IOException e) {
log.error(e.getMessage());
}
return userList;
}
/**
* 方法描述: 读取电影数据
*
* @param
* @Return {@link List< ItemDTO>}
* @throws
* @author tarzan
* @date 2020年07月31日 16:54:22
*/
public static List<ItemDTO> getItemData() {
List<ItemDTO> itemList = Lists.newArrayList();
try {
FileInputStream out = new FileInputStream(folderPath+"\\u.item");
InputStreamReader reader = new InputStreamReader(out, StandardCharsets.UTF_8);
BufferedReader in = new BufferedReader(reader);
String line = null;
while ((line = in.readLine()) != null) {
String newline = line.replaceAll("[\t]", " ");
String[] ht = newline.split("\\|");
Integer id = Integer.parseInt(ht[0]);
String name = ht[1];
String date = ht[2];
String link = ht[3];
ItemDTO dto = new ItemDTO(id, name, date, link);
itemList.add(dto);
}
} catch (IOException e) {
log.error(e.getMessage());
}
return itemList;
}
}

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src/main/java/com/tarzan/recommend/Service/Recommend.java Normal file
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package com.tarzan.recommend.Service;
import com.tarzan.recommend.core.CoreMath;
import com.tarzan.recommend.dto.ItemDTO;
import com.tarzan.recommend.dto.RelateDTO;
import java.util.List;
import java.util.stream.Collectors;
/**
* 推荐服务
*
* @author liu yapeng
* @version 1.0
* @copyright (c) 2019 LuoYang TuLian Co'Ltd Inc. All rights reserved.
* @date 2020/7/31$ 16:18$
* @since JDK1.8
*/
public class Recommend{
/**
* 方法描述: 猜你喜欢
*
* @param
* @Return {@link List< ItemDTO>}
* @throws
* @author tarzan
* @date 2020年07月31日 17:28:06
*/
public static List<ItemDTO> guessYouLike(){
CoreMath coreMath = new CoreMath();
List<RelateDTO> data= FileDataSource.getData();
List<Integer> recommendations = coreMath.recommend(2, data);
List<ItemDTO> itemList= FileDataSource.getItemData().stream().filter(e->recommendations.contains(e.getId())).collect(Collectors.toList());
return itemList;
}
public static void main(String[] args) {
List<ItemDTO> itemList= Recommend.guessYouLike();
System.out.println("------猜你可能喜欢---------------下列电影="+itemList.stream().map(e->e.getName()).collect(Collectors.toList()));
}
}

109
src/main/java/com/tarzan/recommend/core/CoreMath.java Normal file
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package com.tarzan.recommend.core;
import com.tarzan.recommend.dto.RelateDTO;
import org.assertj.core.util.Lists;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
/**
* 核心算法
*
* @author tarzan
* @version 1.0
* @company 洛阳图联科技有限公司
* @copyright (c) 2019 LuoYang TuLian Co'Ltd Inc. All rights reserved.
* @date 2020/7/31$ 15:21$
* @since JDK1.8
*/
public class CoreMath {
public List<Integer> recommend(Integer userId, List<RelateDTO> list) {
//找到最近邻用户id
Map<Double, Integer> distances = computeNearestNeighbor(userId, list);
Integer nearest = distances.values().iterator().next();
Map<Integer, List<RelateDTO>> userMap=list.stream().collect(Collectors.groupingBy(RelateDTO::getUseId));
//最近邻用户看过电影列表
List<Integer> neighborItemList = userMap.get(nearest).stream().map(e->e.getModuleId()).collect(Collectors.toList());
//指定用户看过电影列表
List<Integer> userItemList = userMap.get(userId).stream().map(e->e.getModuleId()).collect(Collectors.toList());;
//找到最近邻看过，但是该用户没看过的电影，计算推荐，放入推荐列表
List<Integer> recommendList = new ArrayList<>();
for (Integer item : neighborItemList) {
if (!userItemList.contains(item)) {
recommendList.add(item);
}
}
Collections.sort(recommendList);
return recommendList;
}
/**
* 在给定userId的情况下，计算其他用户和它的相关系数并排序
* @param userId
* @param list
* @return
*/
private Map<Double, Integer> computeNearestNeighbor(Integer userId, List<RelateDTO> list) {
Map<Integer, List<RelateDTO>> userMap=list.stream().collect(Collectors.groupingBy(RelateDTO::getUseId));
Map<Double, Integer> distances = new TreeMap<>();
userMap.forEach((k,v)->{
if(k!=userId){
double distance = pearson_dis(v,userMap.get(userId));
distances.put(distance, k);
}
});
return distances;
}
/**
* 计算两个序列间的相关系数
*
* @param xList
* @param yList
* @return
*/
private double pearson_dis(List<RelateDTO> xList, List<RelateDTO> yList) {
List<Integer> xs= Lists.newArrayList();
List<Integer> ys= Lists.newArrayList();
xList.forEach(x->{
yList.forEach(y->{
if(x.getModuleId()==y.getModuleId()){
xs.add(x.getIndex());
ys.add(y.getIndex());
}
});
});
return getRelate(xs,ys);
}
/**
* 方法描述: 皮尔森（pearson）相关系数计算
*
* @param xs
* @param ys
* @Return {@link Double}
* @throws
* @author tarzan
* @date 2020年07月31日 17:03:20
*/
public static Double getRelate(List<Integer> xs, List<Integer> ys){
int n=xs.size();
double Ex= xs.stream().mapToDouble(x->x).sum();
double Ey=ys.stream().mapToDouble(y->y).sum();
double Ex2=xs.stream().mapToDouble(x->Math.pow(x,2)).sum();
double Ey2=ys.stream().mapToDouble(y->Math.pow(y,2)).sum();
double Exy= IntStream.range(0,n).mapToDouble(i->xs.get(i)*ys.get(i)).sum();
double numerator=Exy-Ex*Ey/n;
double denominator=Math.sqrt((Ex2-Math.pow(Ex,2)/n)*(Ey2-Math.pow(Ey,2)/n));
if (denominator==0) return 0.0;
return numerator/denominator;
}
}

26
src/main/java/com/tarzan/recommend/dto/ItemDTO.java Normal file
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package com.tarzan.recommend.dto;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* 业务项
*
* @author liu yapeng
* @version 1.0
* @company 洛阳图联科技有限公司
* @copyright (c) 2019 LuoYang TuLian Co'Ltd Inc. All rights reserved.
* @date 2020/7/31$ 15:02$
* @since JDK1.8
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class ItemDTO {
private Integer id;
private String name;
private String date;
private String link;
}

29
src/main/java/com/tarzan/recommend/dto/RelateDTO.java Normal file
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package com.tarzan.recommend.dto;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* 关系数据
*
* @author liu yapeng
* @version 1.0
* @company 洛阳图联科技有限公司
* @copyright (c) 2019 LuoYang TuLian Co'Ltd Inc. All rights reserved.
* @date 2020/7/31$ 14:51$
* @since JDK1.8
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class RelateDTO {
//用户id
private Integer useId;
//业务id
private Integer moduleId;
//指数
private Integer index;
}

32
src/main/java/com/tarzan/recommend/dto/UserDTO.java Normal file
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package com.tarzan.recommend.dto;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* 用户对象
*
* @author liu yapeng
* @version 1.0
* @company 洛阳图联科技有限公司
* @copyright (c) 2019 LuoYang TuLian Co'Ltd Inc. All rights reserved.
* @date 2020/7/31$ 14:55$
* @since JDK1.8
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserDTO {
//主键
private Integer id;
//年纪
private Integer age;
//性别
private String sex;
//职业
private String profession;
//邮编
private String postcode;
}

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100000
src/main/resources/ml-100k/u.data Normal file
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src/main/resources/ml-100k/u.genre Normal file
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unknown|0
Action|1
Adventure|2
Animation|3
Children's|4
Comedy|5
Crime|6
Documentary|7
Drama|8
Fantasy|9
Film-Noir|10
Horror|11
Musical|12
Mystery|13
Romance|14
Sci-Fi|15
Thriller|16
War|17
Western|18

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src/main/resources/ml-100k/u.item Normal file
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src/main/resources/ml-100k/u.user Normal file
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1|24|M|technician|85711
2|53|F|other|94043
3|23|M|writer|32067
4|24|M|technician|43537
5|33|F|other|15213
6|42|M|executive|98101
7|57|M|administrator|91344
8|36|M|administrator|05201
9|29|M|student|01002
10|53|M|lawyer|90703
11|39|F|other|30329
12|28|F|other|06405
13|47|M|educator|29206
14|45|M|scientist|55106
15|49|F|educator|97301
16|21|M|entertainment|10309
17|30|M|programmer|06355
18|35|F|other|37212
19|40|M|librarian|02138
20|42|F|homemaker|95660
21|26|M|writer|30068
22|25|M|writer|40206
23|30|F|artist|48197
24|21|F|artist|94533
25|39|M|engineer|55107
26|49|M|engineer|21044
27|40|F|librarian|30030
28|32|M|writer|55369
29|41|M|programmer|94043
30|7|M|student|55436
31|24|M|artist|10003
32|28|F|student|78741
33|23|M|student|27510
34|38|F|administrator|42141
35|20|F|homemaker|42459
36|19|F|student|93117
37|23|M|student|55105
38|28|F|other|54467
39|41|M|entertainment|01040
40|38|M|scientist|27514
41|33|M|engineer|80525
42|30|M|administrator|17870
43|29|F|librarian|20854
44|26|M|technician|46260
45|29|M|programmer|50233
46|27|F|marketing|46538
47|53|M|marketing|07102
48|45|M|administrator|12550
49|23|F|student|76111
50|21|M|writer|52245
51|28|M|educator|16509
52|18|F|student|55105
53|26|M|programmer|55414
54|22|M|executive|66315
55|37|M|programmer|01331
56|25|M|librarian|46260
57|16|M|none|84010
58|27|M|programmer|52246
59|49|M|educator|08403
60|50|M|healthcare|06472
61|36|M|engineer|30040
62|27|F|administrator|97214
63|31|M|marketing|75240
64|32|M|educator|43202
65|51|F|educator|48118
66|23|M|student|80521
67|17|M|student|60402
68|19|M|student|22904
69|24|M|engineer|55337
70|27|M|engineer|60067
71|39|M|scientist|98034
72|48|F|administrator|73034
73|24|M|student|41850
74|39|M|scientist|T8H1N
75|24|M|entertainment|08816
76|20|M|student|02215
77|30|M|technician|29379
78|26|M|administrator|61801
79|39|F|administrator|03755
80|34|F|administrator|52241
81|21|M|student|21218
82|50|M|programmer|22902
83|40|M|other|44133
84|32|M|executive|55369
85|51|M|educator|20003
86|26|M|administrator|46005
87|47|M|administrator|89503
88|49|F|librarian|11701
89|43|F|administrator|68106
90|60|M|educator|78155
91|55|M|marketing|01913
92|32|M|entertainment|80525
93|48|M|executive|23112
94|26|M|student|71457
95|31|M|administrator|10707
96|25|F|artist|75206
97|43|M|artist|98006
98|49|F|executive|90291
99|20|M|student|63129
100|36|M|executive|90254
101|15|M|student|05146
102|38|M|programmer|30220
103|26|M|student|55108
104|27|M|student|55108
105|24|M|engineer|94043
106|61|M|retired|55125
107|39|M|scientist|60466
108|44|M|educator|63130
109|29|M|other|55423
110|19|M|student|77840
111|57|M|engineer|90630
112|30|M|salesman|60613
113|47|M|executive|95032
114|27|M|programmer|75013
115|31|M|engineer|17110
116|40|M|healthcare|97232
117|20|M|student|16125
118|21|M|administrator|90210
119|32|M|programmer|67401
120|47|F|other|06260
121|54|M|librarian|99603
122|32|F|writer|22206
123|48|F|artist|20008
124|34|M|student|60615
125|30|M|lawyer|22202
126|28|F|lawyer|20015
127|33|M|none|73439
128|24|F|marketing|20009
129|36|F|marketing|07039
130|20|M|none|60115
131|59|F|administrator|15237
132|24|M|other|94612
133|53|M|engineer|78602
134|31|M|programmer|80236
135|23|M|student|38401
136|51|M|other|97365
137|50|M|educator|84408
138|46|M|doctor|53211
139|20|M|student|08904
140|30|F|student|32250
141|49|M|programmer|36117
142|13|M|other|48118
143|42|M|technician|08832
144|53|M|programmer|20910
145|31|M|entertainment|V3N4P
146|45|M|artist|83814
147|40|F|librarian|02143
148|33|M|engineer|97006
149|35|F|marketing|17325
150|20|F|artist|02139
151|38|F|administrator|48103
152|33|F|educator|68767
153|25|M|student|60641
154|25|M|student|53703
155|32|F|other|11217
156|25|M|educator|08360
157|57|M|engineer|70808
158|50|M|educator|27606
159|23|F|student|55346
160|27|M|programmer|66215
161|50|M|lawyer|55104
162|25|M|artist|15610
163|49|M|administrator|97212
164|47|M|healthcare|80123
165|20|F|other|53715
166|47|M|educator|55113
167|37|M|other|L9G2B
168|48|M|other|80127
169|52|F|other|53705
170|53|F|healthcare|30067
171|48|F|educator|78750
172|55|M|marketing|22207
173|56|M|other|22306
174|30|F|administrator|52302
175|26|F|scientist|21911
176|28|M|scientist|07030
177|20|M|programmer|19104
178|26|M|other|49512
179|15|M|entertainment|20755
180|22|F|administrator|60202
181|26|M|executive|21218
182|36|M|programmer|33884
183|33|M|scientist|27708
184|37|M|librarian|76013
185|53|F|librarian|97403
186|39|F|executive|00000
187|26|M|educator|16801
188|42|M|student|29440
189|32|M|artist|95014
190|30|M|administrator|95938
191|33|M|administrator|95161
192|42|M|educator|90840
193|29|M|student|49931
194|38|M|administrator|02154
195|42|M|scientist|93555
196|49|M|writer|55105
197|55|M|technician|75094
198|21|F|student|55414
199|30|M|writer|17604
200|40|M|programmer|93402
201|27|M|writer|E2A4H
202|41|F|educator|60201
203|25|F|student|32301
204|52|F|librarian|10960
205|47|M|lawyer|06371
206|14|F|student|53115
207|39|M|marketing|92037
208|43|M|engineer|01720
209|33|F|educator|85710
210|39|M|engineer|03060
211|66|M|salesman|32605
212|49|F|educator|61401
213|33|M|executive|55345
214|26|F|librarian|11231
215|35|M|programmer|63033
216|22|M|engineer|02215
217|22|M|other|11727
218|37|M|administrator|06513
219|32|M|programmer|43212
220|30|M|librarian|78205
221|19|M|student|20685
222|29|M|programmer|27502
223|19|F|student|47906
224|31|F|educator|43512
225|51|F|administrator|58202
226|28|M|student|92103
227|46|M|executive|60659
228|21|F|student|22003
229|29|F|librarian|22903
230|28|F|student|14476
231|48|M|librarian|01080
232|45|M|scientist|99709
233|38|M|engineer|98682
234|60|M|retired|94702
235|37|M|educator|22973
236|44|F|writer|53214
237|49|M|administrator|63146
238|42|F|administrator|44124
239|39|M|artist|95628
240|23|F|educator|20784
241|26|F|student|20001
242|33|M|educator|31404
243|33|M|educator|60201
244|28|M|technician|80525
245|22|M|student|55109
246|19|M|student|28734
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879|33|F|administrator|55337
880|13|M|student|83702
881|39|M|marketing|43017
882|35|M|engineer|40503
883|49|M|librarian|50266
884|44|M|engineer|55337
885|30|F|other|95316
886|20|M|student|61820
887|14|F|student|27249
888|41|M|scientist|17036
889|24|M|technician|78704
890|32|M|student|97301
891|51|F|administrator|03062
892|36|M|other|45243
893|25|M|student|95823
894|47|M|educator|74075
895|31|F|librarian|32301
896|28|M|writer|91505
897|30|M|other|33484
898|23|M|homemaker|61755
899|32|M|other|55116
900|60|M|retired|18505
901|38|M|executive|L1V3W
902|45|F|artist|97203
903|28|M|educator|20850
904|17|F|student|61073
905|27|M|other|30350
906|45|M|librarian|70124
907|25|F|other|80526
908|44|F|librarian|68504
909|50|F|educator|53171
910|28|M|healthcare|29301
911|37|F|writer|53210
912|51|M|other|06512
913|27|M|student|76201
914|44|F|other|08105
915|50|M|entertainment|60614
916|27|M|engineer|N2L5N
917|22|F|student|20006
918|40|M|scientist|70116
919|25|M|other|14216
920|30|F|artist|90008
921|20|F|student|98801
922|29|F|administrator|21114
923|21|M|student|E2E3R
924|29|M|other|11753
925|18|F|salesman|49036
926|49|M|entertainment|01701
927|23|M|programmer|55428
928|21|M|student|55408
929|44|M|scientist|53711
930|28|F|scientist|07310
931|60|M|educator|33556
932|58|M|educator|06437
933|28|M|student|48105
934|61|M|engineer|22902
935|42|M|doctor|66221
936|24|M|other|32789
937|48|M|educator|98072
938|38|F|technician|55038
939|26|F|student|33319
940|32|M|administrator|02215
941|20|M|student|97229
942|48|F|librarian|78209
943|22|M|student|77841

13
src/test/java/com/tarzan/recommend/RecommendSystemApplicationTests.java Normal file
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package com.tarzan.recommend;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class RecommendSystemApplicationTests {
@Test
void contextLoads() {
}
}