what are the meaning of these codes?

[lyzhangjm]

%GD
if( opts.flag2 && net.vars(net.getVarIndex('top1err')).value/batchSize<0.2)
fprintf('updating G\n');
opts.flag1 = true;
opts.flag2 = false;
end
if( opts.flag1 && net.vars(net.getVarIndex('top1err')).value/batchSize>0.6)
fprintf('updating D\n');
end
opts.flag1 = false;
opts.flag2 = true;

In any case, opts.flag1 will be false, and opts.flag2 will be true. Hence, what will be the effort of the opts.flag1 and opts.flag2 ?
Thanks