Author: David Monllao
MDL-57791 mlbackend_php: Minimum 2 samples per target value
http://git.moodle.org/gw?p=moodle.git;a=commit;h=98b2f06fe7a77bf832ddd21a2d024d3222893ca4
http://github.com/moodle/moodle/commit/98b2f06fe7a77bf832ddd21a2d024d3222893ca4
+ 3.4 en [bettercli,tool_models]
+ 3.4 en [errornotenoughdata,mlbackend_php]
+ 3.4 en [errornotenoughdatadev,mlbackend_php]