transformers gguf mergekit merge arxiv:2306.01708 base_model:Qwen/Qwen2.5-7B base_model:merge:Qwen/Qwen2.5-7B base_model:fblgit/cybertron-v4-qw7B-MGS base_model:merge:fblgit/cybertron-v4-qw7B-MGS base_model:rombodawg/Rombos-LLM-V2.5-Qwen-7b base_model:merge:rombodawg/Rombos-LLM-V2.5-Qwen-7b endpoints_compatible region:us conversational