https://opennlp.apache.org/docs/2.5.4/apidocs/opennlp-tools/opennlp/tools/ml/maxent/quasinewton/QNMinimizer.L2RegFunction.html
QNMinimizer.L2RegFunction (Apache OpenNLP Tools 2.5.4 API)
declaration: package: opennlp.tools.ml.maxent.quasinewton, class: QNMinimizer, class: L2RegFunction
apache opennlptoolsapi