def dKdiag_dX(self, dL_dKdiag, X, target):
        pass
send me a list of (artist,title,mp3_url)
dataset/ETHPy150Open SheffieldML/GPy/GPy/kern/src/todo/gibbs.py/Gibbs.dKdiag_dX--crossover with--dataset/ETHPy150Open echonest/pyechonest/examples/try_new_things.py/write_xspf