SGD TrainNewsGroups interim output

[Grant Ingersoll]

In the SGD TrainNewsGroups example, we have:
System.out.printf("%.2f\t%.2f\t%.2f\t%.2f\t%.8g\t%.8g\t", maxBeta, nonZeros, 
positive, norm, lambda, mu);

Do we have any docs explaining what these values mean and what one should be 
looking for to know whether the system is performing or not?

Thanks,
Grant