updated linear regression and ensured it is working properly
updated linear regression and ensured it is working properly


Former-commit-id: 13febe643d161247aaf45e9047f4afa8b3099d09
Former-commit-id: 42f5a90d1c2ffcae914df067cc29295f33ee7071
dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy