zzheng90

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![image](https://user-images.githubusercontent.com/73642409/183438566-b9bae9f3-2c81-471c-ab92-eea7b9a165d0.png) There is a problem when I run the command 'python ./ontology_viz.py -o test.dot test.ttl -O ontology.ttl' I have installed 'rdflib >= 6.0.0, < 7.0.0 graphviz == 0.17' and python=3.8