More efficient calculation of axial currents #460
Merged
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Fixes #459.
The calculation of axial currents from membrane potentials is very slow, and I found that most of the time was spent on recalculating the ''children_dict" and "connection_dict" for each segment, which is unnecessary since these do not change.
This PR moves the calculation of ''children_dict" and "connection_dict" outside the loop. All tests pass locally, and I get identical answers as before for a Hay model example. Importantly, the execution time went from 13 seconds to 0.4 seconds.