Persistence diagram failed/empty list for some neurons

[yanyanming77]

Hi:

I'm using this TMD method for SWC file classification for basal dendrites, it yields pretty good results. But for some SWCs, when using get_ph_neuron(), some neurons failed with an error "key error", and some neurons have nothing in the persistence diagram list. Could you please shed some light on what's causing the issue?

Thanks!