Glove公式推导

定义符号： X i = ∑ j = 1 N X i , j P i , k = X i , k X i r a t i o i , j , k = P i , k P j , k X_i = \sum_{j=1}^N{X_{i,j}}\\ P_{i,k} = \frac{X_{i,k}}{X_i}\\ ratio_{i,j,k} = \frac{P_{i,k}}{P_{j,k}} Xi​=j=1∑

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