Question on Encoding

Hello all!

I have been reading about methodologies to better understand fine tuning with BERT and came across this paper.

"A Fine-Tuned BERT-Based Transfer Learning Approach for Text Classification" https://www.hindawi.com/journals/jhe/2022/3498123/

I was wondering if someone could help set my head straight on Encoding methods. Particularly, section 4.3 Encoding and the "Encoding" column of Figure 1.

I have not seen this approach in fine-tuning for text classifications before. For example, when I see applications using huggingfaces BertTokenizer, it tokenizes, converts to …

encoding languagetechnology