peft mistral generated_from_trainer ca dataset:xaviviro/oasst2_ca_gpt base_model:teknium/OpenHermes-2-coder-Mistral-7B-v2-e4 base_model:adapter:teknium/OpenHermes-2-coder-Mistral-7B-v2-e4 license:apache-2.0 4-bit bitsandbytes region:us