Papers by Vladimir Karpukhin
Multi-Task Retrieval for Knowledge-Intensive Tasks (2021.acl-long)
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Jean Maillard, Vladimir Karpukhin, Fabio Petroni, Wen-tau Yih, Barlas Oguz, Veselin Stoyanov, Gargi Ghosh
| Challenge: | Knowledge-intensive tasks require large amounts of knowledge about the world . recent neural retrieval models achieve better results by learning directly from task-specific training data. |
| Approach: | They propose a multi-task trained neural retrieval model that can be universally trained on a wide variety of problems. |
| Outcome: | The proposed model outperforms specialised retrievers on a few-shot setting and matches or improves state-of-the-art on multiple benchmarks. |
Joint Verification and Reranking for Open Fact Checking Over Tables (2021.acl-long)
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Michael Sejr Schlichtkrull, Vladimir Karpukhin, Barlas Oguz, Mike Lewis, Wen-tau Yih, Sebastian Riedel
| Challenge: | Existing research into structured data has focused on textual data and the closed-domain setting is not reflective of real-world fact checking tasks. |
| Approach: | They propose a joint reranking-and-verification model which fuses evidence documents in the verification component and a heuristic retrieval baseline. |
| Outcome: | The proposed model achieves comparable performance to the closed-domain state-of-the-art on the TabFact dataset and significantly improves over a heuristic retrieval baseline. |
Discourse-Aware Soft Prompting for Text Generation (2022.emnlp-main)
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| Challenge: | Recent advances in pre-trained langauge models (PLMs) have made great impact on text generation research. |
| Approach: | They propose to use hierarchical blocking to simulate a higher-level discourse structure of human written text and attention sparsity to learn sparse transformations on the softmax-function. |
| Outcome: | The proposed methods perform better on some generation tasks but don't generalize across all generation tasks. |
Arcee’s MergeKit: A Toolkit for Merging Large Language Models (2024.emnlp-industry)
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Charles Goddard, Shamane Siriwardhana, Malikeh Ehghaghi, Luke Meyers, Vladimir Karpukhin, Brian Benedict, Mark McQuade, Jacob Solawetz
| Challenge: | Open-source language models can merge their parameters to improve performance and versatility without additional training. |
| Approach: | They propose to integrate model checkpoints into powerful multitask models without additional training. |
| Outcome: | the library has facilitated the merging of thousands of models, contributing to some of the world’s most powerful open-source model checkpoints. |
Dense Passage Retrieval for Open-Domain Question Answering (2020.emnlp-main)
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Vladimir Karpukhin, Barlas Oguz, Sewon Min, Patrick Lewis, Ledell Wu, Sergey Edunov, Danqi Chen, Wen-tau Yih
| Challenge: | Open-domain question answering relies on efficient passage retrieval to select candidate contexts. |
| Approach: | They propose a dual-encoder framework that can be implemented to retrieve passages from a small number of questions and passages. |
| Outcome: | The proposed system outperforms a strong Lucene-BM25 system in top-20 passage retrieval accuracy on multiple open-domain QA benchmarks. |
Training on Synthetic Noise Improves Robustness to Natural Noise in Machine Translation (D19-55)
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| Challenge: | Recent machine translation methods are highly sensitive to orthographical variations such as spelling errors. |
| Approach: | They propose to train machine translation models with random synthetic noise at training time . they focus on translation performance on natural typos, and show robustness to such noise . |
| Outcome: | The proposed method significantly improves translation models on natural typos without accessing natural noise data or distribution. |
Nonparametric Decoding for Generative Retrieval (2023.findings-acl)
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Hyunji Lee, JaeYoung Kim, Hoyeon Chang, Hanseok Oh, Sohee Yang, Vladimir Karpukhin, Yi Lu, Minjoon Seo
| Challenge: | Existing text retrieval models depend on the information encoded in its parameters without external memory, its information capacity is limited and fixed. |
| Approach: | They propose a nonparametric decoding approach which uses external memory instead of vanilla vocab embeddings as decoder voka embedds. |
| Outcome: | The proposed model can utilize parametric and nonparametric space. |
KILT: a Benchmark for Knowledge Intensive Language Tasks (2021.naacl-main)
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Fabio Petroni, Aleksandra Piktus, Angela Fan, Patrick Lewis, Majid Yazdani, Nicola De Cao, James Thorne, Yacine Jernite, Vladimir Karpukhin, Jean Maillard, Vassilis Plachouras, Tim Rocktäschel, Sebastian Riedel
| Challenge: | Existing models for knowledge-intensive language tasks require access to large, external knowledge sources. |
| Approach: | They propose a benchmark for knowledge-intensive language tasks (KILT) they test a shared dense vector index coupled with a seq2seq model to generate disambiguated text. |
| Outcome: | The proposed model outperforms tailor-made approaches on fact checking, open-domain question answering and dialog by generating disambiguated text. |
UniK-QA: Unified Representations of Structured and Unstructured Knowledge for Open-Domain Question Answering (2022.findings-naacl)
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Barlas Oguz, Xilun Chen, Vladimir Karpukhin, Stan Peshterliev, Dmytro Okhonko, Michael Schlichtkrull, Sonal Gupta, Yashar Mehdad, Scott Yih
| Challenge: | a recent study aims to answer factual questions using a structured knowledge base (KBQA). |
| Approach: | They propose a unifying approach that homogenizes all knowledge sources by reducing them to text . they demonstrate that UniK-QA is a simple and yet effective way to combine heterogeneous sources of knowledge. |
| Outcome: | The proposed approach improves state-of-the-art results on knowledge-base QA tasks by 11 points compared to graph-based methods. |
Domain-matched Pre-training Tasks for Dense Retrieval (2022.findings-naacl)
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Barlas Oguz, Kushal Lakhotia, Anchit Gupta, Patrick Lewis, Vladimir Karpukhin, Aleksandra Piktus, Xilun Chen, Sebastian Riedel, Scott Yih, Sonal Gupta, Yashar Mehdad
| Challenge: | Existing approaches to improve performance of pre-training tasks are needed. |
| Approach: | They propose to pre-train large bi-encoder models on a recently released set of 65 millionsynthetically generated questions and 200 million post-comment pairs from a preexisting reddit conversation dataset. |
| Outcome: | The proposed model can be pre-trained on a set of 65 millionsynthetically generated questions and 200 million post-comment pairs from a preexisting dataset of Reddit conversations. |