RAGatouille safetensors bert ColBERT sentence-similarity ja dataset:bclavie/mmarco-japanese-hard-negatives dataset:unicamp-dl/mmarco arxiv:2312.16144 arxiv:2310.19349 base_model:tohoku-nlp/bert-base-japanese-v3 base_model:finetune:tohoku-nlp/bert-base-japanese-v3 license:mit region:us