Execution Error in Tutorial (docs/tutorials/AmpliGraphBasicsTutorial.ipynb)

### Description I was trying to go through the tutorial with Game of Throne dataset as indicated in title but I got an error while initiating the link prediction model (ComplEx). ### Actual Behavior I followed the exact code, no modification. I have tried for ampligraph==2.0.0 and 2.1.0, the results were the same.  The error looks like this. The version in tuto is actually 2.0-dev, I also tried for the latest dev version but there was still the same error. Can somebody help me?