implement update_gradients_diag for MLP kernel
implement update_gradients_diag for MLP kernel

buntyke/GPy,buntyke/GPy,beckdaniel/GPy,strongh/GPy,Dapid/GPy,Dapid/GPy,maaskola/GPy,ysekky/GPy,fivejjs/GPy,strongh/GPy,mikecroucher/GPy,ysekky/GPy,SheffieldML/GPy,jameshensman/GPy,mikecroucher/GPy,AlexGrig/GPy,avehtari/GPy,befelix/GPy,beckdaniel/GPy,AlexGrig/GPy,dhhjx880713/GPy,SheffieldML/GPy,beckdaniel/GPy,mikecroucher/GPy,esiivola/GPYgradients,befelix/GPy,PredictiveScienceLab/GPy,esiivola/GPYgradients,mikecroucher/GPy,gusmaogabriels/GPy,maaskola/GPy,fivejjs/GPy,AlexGrig/GPy,TianpeiLuke/GPy,befelix/GPy,beckdaniel/GPy,gusmaogabriels/GPy,ptonner/GPy,gusmaogabriels/GPy,TianpeiLuke/GPy,buntyke/GPy,avehtari/GPy,Dapid/GPy,jameshensman/GPy,avehtari/GPy,jameshensman/GPy,PredictiveScienceLab/GPy,PredictiveScienceLab/GPy,ysekky/GPy,PredictiveScienceLab/GPy,buntyke/GPy,dhhjx880713/GPy,strongh/GPy,esiivola/GPYgradients,dhhjx880713/GPy,maaskola/GPy,maaskola/GPy,Dapid/GPy,ptonner/GPy,fivejjs/GPy,SheffieldML/GPy,befelix/GPy,ptonner/GPy,ptonner/GPy,AlexGrig/GPy,SheffieldML/GPy,ysekky/GPy,dhhjx880713/GPy,esiivola/GPYgradients,TianpeiLuke/GPy,avehtari/GPy,jameshensman/GPy