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add DeepFM knowledge #734

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8 changes: 4 additions & 4 deletions docs/tutorials/recommendation_system/DeepFM.md
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Expand Up @@ -18,7 +18,7 @@ DeepFM模型结构如下图所示，完成对稀疏特征的嵌入后，由FM层

![](https://ai-studio-static-online.cdn.bcebos.com/8654648d844b4233b3a05e918dedc9b777cf786af2ba49af9a92fc00cd050ef3)

## 2.FM
## 3.FM

FM（Factorization Machines，因子分解机）最早由Steffen Rendle于2010年在ICDM上提出，它是一种通用的预测方法，在即使数据非常稀疏的情况下，依然能估计出可靠的参数进行预测。与传统的简单线性模型不同的是，因子分解机考虑了特征间的交叉，对所有嵌套变量交互进行建模（类似于SVM中的核函数），因此在推荐系统和计算广告领域关注的点击率CTR（click-through rate）和转化率CVR（conversion rate）两项指标上有着良好的表现。

Expand All @@ -31,7 +31,7 @@ $$

![](https://ai-studio-static-online.cdn.bcebos.com/bda8da10940b43ada3337c03332fe06ad1cd95f7780243888050023be33fc88c)
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目前FM的部分描述比较简单，考虑补充FM的学习过程，FM的优缺点等等


## 3.DNN
## 4.DNN

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wide&Deep详细说一下，不一定每个人都知道

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考虑回答一下，为什么选择DNN要跟FM结合，RNN跟FM能够结合吗？分析一下DNN+FM结合的好处

该部分和Wide&Deep模型类似，是简单的前馈网络。在输入特征部分，由于原始特征向量多是高纬度,高度稀疏，连续和类别混合的分域特征，因此将原始的稀疏表示特征映射为稠密的特征向量。

Expand All @@ -51,7 +51,7 @@ DNN深度神经网络层结构如下图所示：

![](https://ai-studio-static-online.cdn.bcebos.com/df8159e1d56646fe868e8a3ed71c6a46f03c716ad1d74f3fae88800231e2f6d8)

## 4.Loss及Auc计算
## 5.Loss及Auc计算

DeepFM模型的损失函数选择Binary_Cross_Entropy（二值交叉熵）函数
$$
Expand All @@ -63,7 +63,7 @@ Auc是Area Under Curve的首字母缩写，这里的Curve指的就是ROC曲线

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在这里加一节DeepFM和其他模型的比较，比如目前在推荐领域中比较流行的深度模型FNN、PNN、Wide&Deep等

可使用paddle.metric.Auc()进行调用。

## 5.参考文献
## 6.参考文献

[IJCAI 2017]Guo, Huifeng，Tang, Ruiming，Ye, Yunming，Li, Zhenguo，He, Xiuqiang. DeepFM: A Factorization-Machine based Neural Network for CTR Prediction

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