removed sympy helpers from init
removed sympy helpers from init

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