getOptimizer(trainingSet); // This will set this.opt if necessary
getOptimizer(trainingSet); // This will set this.opt if necessary
getOptimizer(trainingSet); // This will set this.opt if necessary
getOptimizer(trainingSet); // This will set this.opt if necessary
getOptimizer(trainingSet); // This will set this.opt if necessary
getOptimizer(trainingSet); // This will set this.opt if necessary