4. The computer-implemented method of claim 1 , wherein the incremental feature store is a first incremental feature store, further comprising: maintaining, by the online system, a second incremental feature store; marking the first incremental feature store as inactive at a subsequent time point; and updating features of the second incremental feature store responsive to user actions received by the online system after the subsequent time point.
4. The computer-implemented method of claim 1 , wherein the incremental feature store is a first incremental feature store, further comprising: maintaining, by the online system, a second incremental feature store; marking the first incremental feature store as inactive at a subsequent time point; and updating features of the second incremental feature store responsive to user actions received by the online system after the subsequent time point. 5. The computer-implemented method of claim 4 , further comprising: calculating, by the computer processor, a weighted combination of feature values from the first incremental feature store, from the second incremental feature store, and from the cumulative feature store.