Multi-sample online least-squares#74

Merged

ddbourgin merged 8 commits intomasterfrom

online-regression-update

Jun 1, 2021

Commits on May 28, 2021

added support for online linear regression
kennex2004
committed

Commits on May 29, 2021

added test
kennex2004
committed

Commits on May 30, 2021

Addressed reviewer's concern
kennex2004
committed

Commits on May 31, 2021

Commits on Jun 1, 2021