add_hf_model

Add support for a HuggingFace model in XTuner so it can be trained with the full set of parallelism strategies and optimization switches. The user can provide a HuggingFace Hub repo id, a local model directory, or a model family already supported by transformers. This skill walks through the full path: locating the reference implementation, classifying the model, splitting new code across the model / module / ops…