| Challenge: | Birch is an open-source document retrieval system that integrates with the Anserini information retrieval toolkit to demonstrate end-to-end search over large document collections. |
| Approach: | They propose to integrate Anserini with a BERT-based document ranking model that provides an end-to-end open-source search engine. |
| Outcome: | The proposed system outperforms existing approaches to document retrieval and question answering on standard newswire and social media test collections. |
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| Challenge: | a new open-domain question answering system integrates best practices from IR with a BERT-based reader to identify answers from a large corpus of Wikipedia articles. |
| Approach: | They propose an end-to-end question answering system that integrates BERT with an IR reader. |
| Outcome: | The proposed system improves on a standard benchmark test collection. |
Cross-Domain Modeling of Sentence-Level Evidence for Document Retrieval (D19-1)
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| Challenge: | Existing test collections provide only document-level relevance judgments, and documents exceed the length that BERT was designed to handle. |
| Approach: | They propose to aggregate sentence-level evidence to rank news articles using BERT . they also leverage passage-level relevance judgments available in other domains to fine-tune BERT models that capture cross-domain notions of relevance. |
| Outcome: | The proposed model aggregates sentence-level evidence to rank documents on three standard test collections. |
BERT-QE: Contextualized Query Expansion for Document Re-ranking (2020.findings-emnlp)
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| Challenge: | Existing methods to expand query use pseudo relevance feedback (PRF) but they are under-equipped to evaluate the relevance of information pieces used for expansion. |
| Approach: | They propose a query expansion model that leverages the BERT model to select relevant document chunks for expansion. |
| Outcome: | The proposed model significantly outperforms existing models on the TREC Robust04 and GOV2 test collections. |
FASTMATCH: Accelerating the Inference of BERT-based Text Matching (2020.coling-main)
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| Challenge: | Recent pre-trained language models have shown state-of-the-art accuracies in text matching. |
| Approach: | They propose a BERT-based text matching model where representations and interactions are decoupled . they propose generating final matching scores using a lightweight attention network . |
| Outcome: | Experiments show that the proposed model can achieve up to 100X speed-up to BERT and RoBERTa while keeping more up to 98.7% of the performance. |
Best Practices for Distilling Large Language Models into BERT for Web Search Ranking (2025.coling-industry)
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| Challenge: | Recent studies have highlighted the potential of Large Language Models (LLMs) as zero-shot relevance rankers. |
| Approach: | They propose to use a ranking loss to transfer ranking knowledge from LLMs to smaller models like BERT. |
| Outcome: | The proposed model has been successfully integrated into a commercial web search engine as of February 2024. |
Test-time Corpus Feedback: From Retrieval to RAG (2026.findings-eacl)
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| Challenge: | Retrieval-augmented generation (RAG) pipelines treat retrieval and reasoning as isolated components, limiting performance on complex tasks. |
| Approach: | They propose to integrate large language models with retrieval to improve query quality . they also propose to use feedback to improve the query, retrieved context, or document pool . |
| Outcome: | The proposed methods bridge IR and NLP perspectives and highlight retrieval as a dynamic, learnable component of end-to-end RAG systems. |
Cross-Lingual Training of Neural Models for Document Ranking (2020.findings-emnlp)
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| Challenge: | a recent study shows that multi-lingual BERT models can be used for document ranking in non-English languages . a blog post by Google suggests that the company is exploring this approach to improve web search across a number of languages. |
| Approach: | They propose to leverage relevance judgments in English to train neural document ranking models for mono-lingual retrieval in multiple target languages. |
| Outcome: | The proposed approach improves search quality in non-English languages while requiring low resources. |
Refining BERT Embeddings for Document Hashing via Mutual Information Maximization (2021.findings-emnlp)
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| Challenge: | Existing unsupervised document hashing methods are mostly established on generative models . due to the difficulties of capturing long dependency structures, these methods rarely model the raw documents directly . |
| Approach: | They propose to learn hash codes from BERT embeddings by modifying existing models . they use mutual information maximization principle to maximize mutual information . |
| Outcome: | The proposed method outperforms existing methods learned from BERT embeddings on three benchmark datasets. |
Efficient Document Retrieval by End-to-End Refining and Quantizing BERT Embedding with Contrastive Product Quantization (2022.emnlp-main)
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| Challenge: | Existing semantic hashing methods only learn a binary code for each document and use Hamming distance to evaluate document distances. |
| Approach: | They propose to leverage BERT embeddings to perform efficient retrieval based on product quantization technique . they transform original BERT embedded codewords and feed it into a probabilistic product quantizer module . |
| Outcome: | The proposed method outperforms current state-of-the-art methods on three benchmarks. |
A Primer in BERTology: What We Know About How BERT Works (2020.tacl-1)
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| Challenge: | a new study examines the current state of knowledge about the BERT model . the model is a stack of transformer encoder layers that are based on multiple self-attention ''heads'' |
| Approach: | They present a survey of over 150 studies of the popular Transformer-based model BERT . they discuss the current state of knowledge about how BERT works and how it is represented . |
| Outcome: | The proposed model is based on the Transformer-based model with state-of-the-art results . the proposed model has little cognitive motivation and is too small to perform ablation studies . |