# 机器学习术语表：推荐系统

#recsystems

#recsystems

#recsystems

#recsystems

## 矩阵分解

#recsystems

卡萨布兰卡 《费城故事》 Black Panther 神奇女侠 《低俗小说》

• 用户矩阵，形状为用户数量 X 嵌入维度数量。
• 项矩阵，形状为嵌入维度数量 X 项数量。

User Matrix                 Item Matrix

1.1   2.3           0.9   0.2   1.4    2.0   1.2
0.6   2.0           1.7   1.2   1.2   -0.1   2.1
2.5   0.5


(1.1 * 0.9) + (2.3 * 1.7) = 4.9


(1.1 * 1.4) + (2.3 * 1.2) = 4.3


## 推荐系统

#recsystems

• 类似用户评过分或观看过的影片。
• 类型、导演、演员、目标受众特征...

#recsystems

• 移除用户已购买的商品。
• 提高较新项的得分。

#recsystems

#recsystems

## 加权交替最小二乘 (WALS)

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[{ "type": "thumb-down", "id": "missingTheInformationINeed", "label":"没有我需要的信息" },{ "type": "thumb-down", "id": "tooComplicatedTooManySteps", "label":"太复杂/步骤太多" },{ "type": "thumb-down", "id": "outOfDate", "label":"内容需要更新" },{ "type": "thumb-down", "id": "translationIssue", "label":"翻译问题" },{ "type": "thumb-down", "id": "samplesCodeIssue", "label":"示例/代码问题" },{ "type": "thumb-down", "id": "otherDown", "label":"其他" }]
[{ "type": "thumb-up", "id": "easyToUnderstand", "label":"易于理解" },{ "type": "thumb-up", "id": "solvedMyProblem", "label":"解决了我的问题" },{ "type": "thumb-up", "id": "otherUp", "label":"其他" }]