I appreciate its been a while since this was committed, but I just noticed that some of the TMVA auto-generated code added in this MR is causing memory leak warnings in the sanitizer builds. see for instance the upgrade tests at https://lhcb-nightlies.cern.ch/logs/tests/nightly/lhcb-sanitizers/251/x86_64-centos7-gcc8-dbg+lsan/Brunel/ `TMV_MLP_E.C` and `TMV_MLP_H.C` have issues, perhaps others as well.. Looking at the code, its probably just a cause of making sure the auto-generated code is patch to delete any memory it allocates. Could you please take a look ? FYI @cattanem @jmarchan