Source code for LLMs. [D]

I was digging through Hugging Face’s Transformers repo and found https://github.com/huggingface/transformers/blob/main/src/transformers/models/gpt_oss/modeling_gpt_oss.py From what I can tell, this isn’t just boilerplate, it looks like a full implementation. is it actually the full code on which gpt_oss is built on? or is