Transformers, Explained: Understand the Model Behind GPT-3, BERT, and T5 | by Dale Markowitz | May, 2021 | Towards Data Science
https://daleonai.com/transformers-explained
https://towardsdatascience.com/transformers-explained-understand-the-model-behind-gpt-3-bert-and-t5-cdbf3fc8a40a?gi=3028dd534fbf