Gang,
so the problem is not a memory sharing mismatch between python and C++ as I originally thought, but it is fully on the C++ side.
The TMultiLayerPerceptron objects create TEventLists of which the TFile claims ownership. Once the file closes, the TEventLists get destroyed, but the TMultiLayerPerceptron isn’t done with them nor has it given up ownership.
One way around this, is to delete mlp and mlp1 just before closing the output file:
del mlp, mlp1
fout.Close()
It isn’t clear to me, however, how this code normally is supposed to work …
Cheers,
Wim