that is outside you apply this to em mist you get things like this so these are the columns of the W matrix and what sparse coding does in this case is that it reconstructs every digit in m nest as a linear combination of a small number of those guys okay because only a small number components of Z can be nonzero so a small number of columns will be selected so every digit is gonna be reconstructed as a linear combination of a small number of those you train the W matrix here in sparse coding but just with great understand you have to play a