Automatically harmonise networks with changing compositions?

[krivit]

Something like, given a series of networks with different sets of vertex names, NetSeries() might:

1. Obtain a maximal set of vertices over all the networks.
2. Embed the given networks into it.
3. Set a nodal attribute, e.g., active, to indicate which nodes are active in which time step.
4. Add an %ergmlhs% constraint egocentric(~!active) or similar.
5. Set a nodal attribute, e.g., neophyte, to indicate which nodes were not active in the prior time step. This is something the end-user might put into their model.

@CarterButts , @smjenness , does this sound sensible? What's the state of the art for this?

[mbojan]

fwiw, I'd definitely find such a function (skipping 4) useful as a data wrangling tool, independent of TERGMing.