aiqbench analysis
This research introduces a novel approach to long-context recall by leveraging residual vectors within LLM feed-forward layers, enabling deterministic fact reconstruction without fine-tuning or proportional memory growth. The method successfully handles contexts up to two million tokens, addressing a critical bottleneck in current large language model architectures regarding scalability and efficiency.
Residual Vector-based Reconstruction as Long-Context Recall Regardless of Context Window Size
arXiv:2609.12686v1 Announce Type: cross Abstract: Large language models (LLMs) process long contexts, including long documents and lengthy conversations, but face token-level memory usage that increases proportionally to input length. Although model optimization and lossy prompt compression are widely used, these methods still fail to solve the long-context recall problem beyond pretrained and size-constrained context windows. This paper proposes a long-context recall method that maintains near-constant GPU memory usage as context length increases, without additional training. The main idea is to reconstruct facts using parameter activations in the LLM's feed-forward layers, which store residual vectors representing facts from the source document. Utilizing residual vectors allows the LLM to deterministically reconstruct query relevant facts without referencing the original document, preserving high fidelity and reducing memory usage without fine-tuning weights. Experimental results show that the proposed method enables answering single-fact questions in two-million-token story contexts where previous methods fail.
Abstract:Large language models (LLMs) process long contexts, including long documents and lengthy conversations, but face token-level memory usage that increases proportionally to input length. Although model optimization and lossy prompt compression are widely used, these methods still fail to solve the long-context recall problem beyond pretrained and size-constrained context windows. This paper proposes a long-context recall method that maintains near-constant GPU memory usage as context length increases, without additional training. The main idea is to reconstruct facts using parameter activations in the LLM's feed-forward layers, which store residual vectors representing facts from the source document. Utilizing residual vectors allows the LLM to deterministically reconstruct query relevant facts without referencing the original document, preserving high fidelity and reducing memory usage without fine-tuning weights. Experimental results show that the proposed method enables answering single-fact questions in two-million-token story contexts where previous methods fail.
Artificial Intelligence (cs.AI); Computation and Language (cs.CL)
arXiv:2609.12686 [cs.AI]
(or arXiv:2609.12686v1 [cs.AI] for this version)
https://doi.org/10.48550/arXiv.2609.12686 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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