trick which is that you have to constrain the norm of those vectors to be within a sphere like less than 1 for example otherwise they blow up and the Z variable shrinks but that's not really interesting it's gonna be degenerate solution so you have to constrain the those vectors the columns of W to be small to be bounded and as a result when you train the system the the system identifies those pieces that need to be combined to form characters as kind of small pieces of strokes which is kind of a logical way of decomposing a character