Ciphertext covariance matrix calculation method based on row coding
A technology of covariance matrix and calculation method, which is applied in calculation, computer security devices, complex mathematical operations, etc., can solve problems such as utilization and data exposure, and achieve the effect of ensuring privacy security and providing security protection
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[0032] refer to figure 1 As shown, the invention discloses a method for calculating a ciphertext covariance matrix based on row coding.
[0033] Let the data matrix X∈R n×d , containing n samples, each sample has d-dimensional features, x i,j Represents the j-th feature in the i-th sample.
[0034] in,
[0035] Covariance is generally used to describe the similarity between two random variables. To calculate the covariance matrix, each column of the data matrix X is regarded as a variable, and the covariance matrix is used to describe the similar relationship between the variables in each column and other variables. In addition, (∑ X ) ij with (∑ x ) ji The meaning of the expression is the same, and the values are also equal.
[0036] That is, the covariance matrix ∑ X is a symmetric matrix, and its calculation process is as follows:
[0037] Among them, μ represents the mean vector of the data matrix X, so that μ=[μ 0 ,μ 1 ,…,μ d-1 ], X=[X 0 ,X 1 ,...,...
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