MATLAB Laplacian Score 代码实现及注释

function [score] = laplacian_score(X,Y) % This function calculates the Laplacian Score for a given dataset % Input: X - the dataset (n x d) % Y - the class labels (n x 1) % Output: score - the Laplacian Score for each feature (1 x d)

% Get the number of samples and features [n, d] = size(X);

% Initialize the Laplacian Score vector score = zeros(1, d);

% Calculate the weight matrix W = zeros(n, n); for i = 1:n for j = i+1:n if Y(i) == Y(j) W(i,j) = 1; W(j,i) = 1; end end end

% Calculate the degree matrix D = diag(sum(W));

% Calculate the Laplacian matrix L = D - W;

% Loop through each feature and calculate its Laplacian Score for i = 1:d x = X(:,i); score(i) = x' * L * x / (x' * D * x); end end