[svgp] python 3.x fix for next
[svgp] python 3.x fix for next

ysekky/GPy,dhhjx880713/GPy,befelix/GPy,dhhjx880713/GPy,esiivola/GPYgradients,SheffieldML/GPy,mikecroucher/GPy,ysekky/GPy,avehtari/GPy,mikecroucher/GPy,SheffieldML/GPy,esiivola/GPYgradients,mikecroucher/GPy,esiivola/GPYgradients,SheffieldML/GPy,avehtari/GPy,ysekky/GPy,dhhjx880713/GPy,befelix/GPy,befelix/GPy,befelix/GPy,mikecroucher/GPy,SheffieldML/GPy,dhhjx880713/GPy,esiivola/GPYgradients,ysekky/GPy,avehtari/GPy,avehtari/GPy