And if the right tag is one of "n,nt,nz/PDD" but not "n/PDD" (for example, "nt/PDD"), which means it is a "NN/CTB", the weight of "NN/CTB" will remain unchanged according to the algorithm (updating "n/PDD" changes the "NN/CTB", but updating "nt/PDD" changes it back).
after multiple iterations, useful features derived from the mapping function are typically receive more updates, which take relatively more responsibility for correct prediction.