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Long Term Support Release

  • Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
  • Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
  • PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.

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Defines 1 class

EigenTransformerBase:: (2 methods):
  eigenDecomposition()
  reduce()


Class: EigenTransformerBase  - X-Ref

Class to compute eigen pairs (values & vectors) of a given matrix
with the consideration of numFeatures or totalVariance to be preserved

eigenDecomposition(array $matrix)   X-Ref
Calculates eigenValues and eigenVectors of the given matrix. Returns
top eigenVectors along with the largest eigenValues. The total explained variance
of these eigenVectors will be no less than desired $totalVariance value


reduce(array $data)   X-Ref
Returns the reduced data