You can use this command to apply the delta weights. (https://github.com/lm-sys/FastChat#vicuna-13b)
The delta weights are hosted on huggingface and will be automatically downloaded.
> Unfortunately there's a mismatch between the model generated by the delta patcher and the tokenizer (32001 vs 32000 tokens). There's a tool to fix this at llama-tools (https://github.com/Ronsor/llama-tools). Add 1 token like (C controltoken), and then run the conversion script.
Edit, later: I found some instructive pages on how to use the vicuna weights with llama.cpp (https://lmsysvicuna.miraheze.org/wiki/How_to_use_Vicuna#Use_...) and pre-made ggml format compatible 4-bit quantized vicuna weights, https://huggingface.co/eachadea/ggml-vicuna-13b-4bit/tree/ma... (8GB ready to go, no 60+GB RAM steps needed)