Lot of errors in opt

[CasellaJr]

Hi everyone. I have problems with the command python src/chess_zero/run.py opt

First of all, the procedure I followed is this:

1. I downloaded a dataset of 2000 pgn from ficsgames.org, and I put in the play_data folder
2. Then I ran python src/chess_zero/run.py sl 5 times
3. Then I ran python src/chess_zero/run.py self and I wait for 800 self games
4. I ran python src/chess_zero/run.py opt
   Here, I have some problems, because I receive this error: https://pastebin.com/Px7N0S3U
   Some other times, the errors are related to the memory, but I don't know why they appear rarely, and 99% of times the error is TypeError: 'NoneType' object is not iterable

Someone knows what can I do for solving?
Thanks

[Akababa]

It appears line 19 is the cause:
2019-12-13 22:03:31.118125: W tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not load dynamic library 'nvcuda.dll'; dlerror: nvcuda.dll not found
I assume you're using tensorflow-gpu, did you install CUDA? https://www.tensorflow.org/install/gpu
Alternatively you can try to run it using CPU-only by installing tensorflow (not tensorflow-gpu)