Unverified50% confidenceFactExact time
专用embedding模型通常基于双编码器（Bi-Encoder）架构训练，通过对比学习优化问题-段落向量距离，这是检索专用模型召回率优于通用模型的根本原因
1
Sources
50%
Confidence
Long-term
Relevance
7/25/2026
First Seen
Sources
本地离线RAG应用实战：用Ollama+ChromaDB构建PDF私密问答系统
redditr/ollama7/12/2026
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