Riva Rasa Chatbot: core dump upon training NLU step 3.2.3

Please see screenshot. I am following the Riva/Rasa app tutorial . When I get to step 3.2.3 and try to train Rasas NLU, training hangs then eventually I get a core dump. Attached you will see results of my nvidia-smi at time of dump.

Any help greatly appreciated.

Please provide the following information when requesting support.
Local machine:
Hardware - GPU titan rtx
Hardware - CPU i9
Operating System Ubuntu 20.04
Riva Version 1.8. Beta
TLT Version (if relevant)
How to reproduce the issue ? (This is for errors. Please share the command and the detailed log here)