PyABSA v2.x has been refactored; its APIs are now organized by NLP subtasks. 
Due to many breaking changes, it is not compatible with 1.x versions.
If you need to use pretrained checkpoints, you can use v2.0, 
but if you need to use traning code for v1.x, you need to downgrade to v1.16.27(or eary versions)