Challenge: Existing SFDA methods focus on the adaptation phase, overlooking the impact of source domain training on model generalizability.
Approach: They propose a source-free domain adaptation approach for Question Answering where a model trained on a domain is adapted to unlabeled target domains without additional source data.
Outcome: The proposed model outperforms existing methods in managing domain gaps and demonstrating greater stability across target domains.

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ProQA: Structural Prompt-based Pre-training for Unified Question Answering (2022.naacl-main)

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Challenge: Existing QA research on question answering is focused on specific question types, knowledge domains, or reasoning skills.
Approach: They propose a unified QA paradigm that solves various tasks through a single model.
Outcome: The proposed model improves QA-centric ability on 11 QA benchmarks.
Unsupervised Adaptation of Question Answering Systems via Generative Self-training (2020.emnlp-main)

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Challenge: Supervised self-training methods have transformed applied machine learning . however, adapting to target data has received little attention .
Approach: They propose a method to generate synthetic QA pairs for unsupervised self adaptation . they use massive amounts of data to simulate self-supervised tasks .
Outcome: The proposed method improves QA systems significantly by using less data and training computation than existing augmentation approaches.
QA Domain Adaptation using Hidden Space Augmentation and Self-Supervised Contrastive Adaptation (2022.emnlp-main)

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Challenge: Question answering models often suffer from performance deterioration upon deployment .
Approach: They propose a self-supervised framework called QADA for QA domain adaptation . they propose to augment training QA samples with hidden space augmentation .
Outcome: The proposed framework improves on multiple target datasets over state-of-the-art methods.
PADA: Example-based Prompt Learning for on-the-fly Adaptation to Unseen Domains (2022.tacl-1)

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Challenge: Domain Adaptation (DA) algorithms suffer degradation when applied to out-of-distribution examples.
Approach: They propose an example-based autoregressive Prompt learning algorithm for on-the-fly Any-Domain Adaptation . the algorithm is trained to generate a unique prompt that maps the test example to a semantic space .
Outcome: The proposed model outperforms baselines in 14 multi-source adaptation scenarios.
Learning to Generalize for Cross-domain QA (2023.findings-acl)

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Challenge: Existing methods for QA are hampered by increased training costs . current methods suffer significant performance degradation when applied to out-of-domain examples.
Approach: They propose a method that combines prompting methods and linear probing with fine-tuning strategy, which does not entail additional cost.
Outcome: The proposed method outperforms state-of-the-art baselines with an average increase in F1 score of 4.5%-7.9%.
Domain Adaptation for Question Answering via Question Classification (2022.coling-1)

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Challenge: Question answering systems often experience performance deterioration upon user-generated questions.
Approach: They propose a question classification framework to help QA domains adapt to different domains.
Outcome: The proposed framework improves on state-of-the-art datasets against multiple datasets.
Self-Prompting Large Language Models for Zero-Shot Open-Domain QA (2024.naacl-long)

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Challenge: Open-Domain Question Answering (ODQA) aims to answer questions without explicitly providing specific background documents.
Approach: They propose a framework to explicitly utilize the massive knowledge encoded in LLM parameters and their strong instruction understanding abilities.
Outcome: The proposed framework surpasses state-of-the-art methods on three widely-used ODQA datasets and achieves comparable performance with customized fine-tuned models on full training data.
Open-Domain Question Answering (2020.acl-tutorials)

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Challenge: tutorial provides a comprehensive overview of cutting-edge research in open-domain question answering (QA)
Approach: tutorial provides a comprehensive overview of cutting-edge research in open-domain question answering . focus will shift to cutting- edge models proposed for open- domain QA .
Outcome: The tutorial will cover cutting-edge research in open-domain question answering (QA) it will cover two-stage retriever-reader approaches, dense retriever and end-to-end training, and retriever free methods .
Multi-Domain Multilingual Question Answering (2021.emnlp-tutorials)

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Challenge: Question answering (QA) is one of the most challenging tasks in natural language processing.
Approach: a tutorial examines the state-of-the-art approaches to multi-domain and multilingual QA . they introduce standard benchmarks and discuss out-of the-box training with open-domain QA systems .
Outcome: This tutorial aims to bridge the gap between open-domain and multilingual QA.
Back-Training excels Self-Training at Unsupervised Domain Adaptation of Question Generation and Passage Retrieval (2021.emnlp-main)

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Challenge: Using self-training to train unsupervised domains can be expensive, resulting in poor generalization due to distributional shift.
Approach: They propose to use unaligned data to train unsupervised domain adaptation models using cheap synthetically generated labeled data.
Outcome: The proposed method significantly outperforms self-training on question generation and passage retrieval domains and on MLQuestions and PubMedQA.

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