3 papers
cs.IR2026
Why Advanced Encoders Lag on Sparse Retrieval? The Answer and an Approach to Bridging Vocabulary Gaps
Zhichao Geng, Yang Yang
While advanced foundation models like ModernBERT significantly outperform older architectures in dense retrieval, they surprisingly lag behind the aging BERT-base baseline in learn…
cs.IR2025
Towards Competitive Search Relevance For Inference-Free Learned Sparse Retrievers
Zhichao Geng, Yiwen Wang, Dongyu Ru +1
Learned sparse retrieval, which can efficiently perform retrieval through mature inverted-index engines, has garnered growing attention in recent years. Particularly, the inference…
cs.IR2025
Exploring Sparsification for Inference-free Sparse Retrievers
Xinjie Shen, Zhichao Geng, Yang Yang
With increasing demands for efficiency, information retrieval has developed a branch of sparse retrieval, further advancing towards inference-free retrieval where the documents are…