大语言模型发展树
主要分成底层和3个分支（transformer-encoder类、transformer类、transformer-decoder类）
from:[https://blog.csdn.net/pipisorry/category_12337443.html]
ref:[GitHub - The Practical Guides for Large Language Models]
[Harnessing the Power of LLMs in Practice: A Survey on ChatGPT and Beyond]