case (1): {
QNMinimizer qn = new QNMinimizer(op.trainOptions.qnEstimates, true);
qn.useMinPackSearch();
qn.useDiagonalScaling();
qn.terminateOnAverageImprovement(true);
qn.terminateOnNumericalZero(true);
qn.terminateOnRelativeNorm(true);
theta = qn.minimize(gcFunc, op.trainOptions.qnTolerance, theta, op.trainOptions.qnIterationsPerBatch);
break;
}