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function centroids = kMeansInitCentroids(X, K)
% initialize placeholder
centroids = zeros(K, size(X, 2));
% use randperm to shuffle the row indices of X
shuffle_X = randperm(size(X,1));
% only use the first K number of shuffled indices
first_K = shuffle_X(1:K, :);
for i=1:K
centroids(i, :) = X(i, :);
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