=== 4.5 Onwards ===

This file has been replaced by UPGRADING.md. See MDL-81125 for further information.

===
This files describes API changes in the mlbackend_php code, the
information provided here is intended especially for developers.

=== 3.8 ===

* The phi coefficient (Matthews' correlation coefficient) has been replaced by
  the F1 score as the main accuracy metric. Therefore, \mlbackend_php\processor::get_phi
  method has been removed.
