Large language models (LLMs) call for extension of context to handle many critical applications. However, the existing approaches are prone to expensive costs and inferior quality of context extension. In this work, we proposeExtensible Embedding, which realizes high-quality extension of LLM's context with strong flexibility and cost-effectiveness. Extensible embedding stand as an enhancement of typical token embedding, which represents the information for an extensible scope of context instead of a single token. By leveraging such compact input units of higher information density, the LLM can access to a vast scope of context even with a small context window. Extensible embedding is systematically optimized in architecture and training method, which leads to multiple advantages. 1) High flexibility of context extension, which flexibly supports ad-hoc extension of diverse context lengths. 2) Strong sample efficiency of training, which enables the embedding model to be learned in a cost-effective way. 3) Superior compatibility with the existing LLMs, where the extensible embedding can be seamlessly introduced as a plug-in component. Comprehensive evaluations on long-context language modeling and understanding tasks verify extensible embedding as an effective, efficient, flexible, and compatible method to extend the LLM's context.

通过可扩展嵌入实现了高质量、灵活、具有成本效益的扩展大型语言模型的上下文，通过优化架构和训练方法，具有上下文扩展的高灵活性、低成本的训练和与现有大型语言模型的兼容性，进而在长上下文语言建模和理解任务上进行综合评估，验证了可扩展嵌入作为一种有效、高效、灵活和兼容的扩展大型语言模型上下文的方法。

BGE地标嵌入：用于检索增强的长上下文大语言模型的无分块嵌入方法