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y^(x)=w0+∑i=1nwixi+∑i=1n∑j=i+1n⟨vi,vj⟩xixj\hat{y}(\mathbf{x}) = w_0 + \sum_{i=1}^{n} w_i x_i + \sum_{i=1}^{n} \sum_{j=i+1}^{n} \langle \mathbf{v}_i, \mathbf{v}_j \rangle x_i x_jy^(x)=w0+∑i=1nwixi+∑i=1n∑j=i+1n⟨vi,vj⟩xixj
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目前效果和理论上比较好的模型，比LR FM都好。
