activitysim

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@jfdman suggested ActivitySim add a skims pre-processor. This could be run at the start of a model to pre-process input skims via a set of user expression files to create additional in-memory skims for later models in order to avoid re-doing some skim operations in separate submodels/chunks/etc. This is similar to caching the TVPB tap to tap total utility "skim". This could save runtime.