deli for big data

[pzivich]

Is your feature request related to a problem? Please describe.

One area of possible use for EE is in pharmacoepi with claims data. Claims data can be millions of rows. Currently, deli hasn't been pushed to those limits.

Describe the solution you'd like

Test out deli with large data (IPTW estimators) and improve everything to be more computationally feasible with very large data sets. This will get into some optimization I haven't done really.

Describe alternatives you've considered

Do nothing

Additional context

None