Пример #1
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 public static final DenseMatrix varOverCols(DenseMatrix mat) {
   return mat.pow(2).sumOverCols().sub(mat.sumOverCols().pow(2).div(mat.cols)).div(mat.cols - 1);
 }
Пример #2
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 public static final DenseMatrix meanOverCols(DenseMatrix mat) {
   return mat.sumOverCols().div(mat.cols);
 }