TODO: optimize distance calculations at different tax levels

[jsevo]

When using cityblock, we won't have to do what's happening here:

taxumap/taxumap/tools.py

Line 20 in 61165d1

def tax_agg(rel_abundances, taxonomy, agg_levels, distance_metric, weights):

The distances can be calculated at ASV level and then the columns of distance matrices can be added based on taxonomy. This distance works, maybe others too.

[jsevo]

Another optimization that is easily possible: allow the user to provide a pre-calculated distance; overall distance or per taxonomic level.