https://github.com/owenliang/itemcf-php
simple itemCF algorithm in php
https://github.com/owenliang/itemcf-php
itemcf php
Last synced: 12 months ago
JSON representation
simple itemCF algorithm in php
- Host: GitHub
- URL: https://github.com/owenliang/itemcf-php
- Owner: owenliang
- Created: 2018-03-29T01:28:02.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2018-03-29T05:12:16.000Z (over 8 years ago)
- Last Synced: 2025-04-08T04:01:33.849Z (about 1 year ago)
- Topics: itemcf, php
- Language: PHP
- Size: 3.91 KB
- Stars: 9
- Watchers: 3
- Forks: 4
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# ItemCF-php
simple itemCF algorithm in php
# 说明
一个单机版的物品协同过滤DEMO，目标是生成物品相似度矩阵。
线上用户可以快速根据浏览的商品ID，从矩阵推荐若干相似商品给用户，既简单又实用。
# 输入
```
A 周杰伦 5
A 林俊杰 2
B 蔡依林 3
B 周杰伦 2
B 林俊杰 4
B 张天爱 3
B 喜洋洋 1
C 周杰伦 5
C 佟丽娅 3
C 蔡依林 5
```
# 物品相似度矩阵
```
{
"周杰伦": {
"林俊杰": 0.8164965809277261,
"蔡依林": 0.8164965809277261,
"张天爱": 0.5773502691896258,
"喜洋洋": 0.5773502691896258,
"佟丽娅": 0.5773502691896258
},
"林俊杰": {
"周杰伦": 0.8164965809277261,
"张天爱": 0.7071067811865475,
"喜洋洋": 0.7071067811865475,
"蔡依林": 0.5
},
"蔡依林": {
"周杰伦": 0.8164965809277261,
"张天爱": 0.7071067811865475,
"喜洋洋": 0.7071067811865475,
"佟丽娅": 0.7071067811865475,
"林俊杰": 0.5
},
"张天爱": {
"喜洋洋": 1,
"蔡依林": 0.7071067811865475,
"林俊杰": 0.7071067811865475,
"周杰伦": 0.5773502691896258
},
"喜洋洋": {
"张天爱": 1,
"蔡依林": 0.7071067811865475,
"林俊杰": 0.7071067811865475,
"周杰伦": 0.5773502691896258
},
"佟丽娅": {
"蔡依林": 0.7071067811865475,
"周杰伦": 0.5773502691896258
}
}
```
# 为已知用户推荐
```
// 为已知用户A作推荐
$recItemsA = $itemCF->recommendByUser('A');
print_r($recItemsA);
Array
(
[0] => Array
(
[iid] => 蔡依林
[est] => 5.0824829046386
)
[1] => Array
(
[iid] => 张天爱
[est] => 4.3009649083212
)
[2] => Array
(
[iid] => 喜洋洋
[est] => 4.3009649083212
)
[3] => Array
(
[iid] => 佟丽娅
[est] => 2.8867513459481
)
)
```
# 为新用户推荐
```
// 为新用户D作推荐, 我们根据最近D用户浏览行为知道D访问过张天爱的相关文章
$recItemsD = $itemCF->recommendByUserItems('D', ['张天爱'], [5,]);
print_r($recItemsD);
Array
(
[0] => Array
(
[iid] => 喜洋洋
[est] => 5
)
[1] => Array
(
[iid] => 蔡依林
[est] => 3.5355339059327
)
[2] => Array
(
[iid] => 林俊杰
[est] => 3.5355339059327
)
[3] => Array
(
[iid] => 周杰伦
[est] => 2.8867513459481
)
)
```