LV interpretability

[Julian-Borbeck]

Count number of Trivial LVs
Of the non Trivial LVs compute expectation of number of Pathways each LV represents ( p0 weighting, p1 weighting, p2 weighting)

[millerh1]

This is low priority because you can just reduce the number of LVs in the model

[millerh1]

The goal of this issue would be to create some function that can take some set of LVs and their pathway loadings and collapse them down to get the aggregate weighting of pathways as a way of interpreting.

If for example, LVs 1, 5, 10, 12, and 21 are significantly predictive of "Cardiac Muscle", then we want to collapse them to get the set of pathways that are most predict of "Cardiac Muscle".