transformers safetensors mistral en dataset:kaist-ai/Multifaceted-Collection-RM dataset:Anthropic/hh-rlhf dataset:tasksource/oasst1_pairwise_rlhf_reward dataset:openai/webgpt_comparisons arxiv:2405.17977 license:apache-2.0 text-generation-inference endpoints_compatible region:us