Challenge: Massively multilingual Transformers (MMTs) have dominated research in multilingual NLP and cross-lingual transfer recently.
Approach: They propose to learn bilingual language pair adapters (BAs) when the goal is to optimize performance for a particular source-target transfer direction.
Outcome: The proposed framework improves performance in three standard downstream tasks and for the majority of low-resource languages.

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Cross-Lingual Transfer with Target Language-Ready Task Adapters (2023.findings-acl)

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Challenge: Existing frameworks for (zero-shot) cross-lingual transfer employ separate language and task adapters which can be arbitrarily combined to perform any task to any target language.
Approach: They propose to fine-tune 'target language-ready' adapters to the target language to achieve better transfer performance without sacrificing the modularity of MAD-X.
Outcome: The proposed adapters outperform MAD-X and BAD-X on most tasks and languages while maintaining the modularity of MAD.
MAD-X: An Adapter-Based Framework for Multi-Task Cross-Lingual Transfer (2020.emnlp-main)

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Challenge: Current deep pretrained models lack capacity to represent all languages . limited capacity is an issue even for high-resource languages where models are not included in training data at all.
Approach: They propose an adapter-based framework that enables high portability and parameter-efficient transfer to arbitrary tasks and languages by learning modular language and task representations.
Outcome: The proposed framework outperforms state-of-the-art models on cross-lingual transfer across languages and typologically diverse models.
Zero-shot Cross-lingual Transfer With Learned Projections Using Unlabeled Target-Language Data (2023.acl-short)

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Challenge: Zero-shot cross-lingual transfer is enabled by pairing the language adapter in the target language with an appropriate task adapter within a source language.
Approach: They propose to use unlabeled text to enhance zero-shot transfer by pairing language adapters with task adapters in a target language.
Outcome: The proposed framework improves on three cross-lingual tasks with up to 11% relative improvement in Named Entity Recognition (NER), Question Answering (QA) and Natural Language Inference (NLI).
A Simple and Effective Method to Improve Zero-Shot Cross-Lingual Transfer Learning (2022.coling-1)

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Challenge: Existing zero-shot cross-lingual transfer methods rely on parallel corpora or bilingual dictionaries . however, its effect is limited by the gap between embedding clusters of different languages .
Approach: They propose Embedding-Push, Attention-Pull, and Robust targets to transfer English embeddings to virtual multilingual embedders without semantic loss.
Outcome: Experimental results show that the proposed method outperforms existing methods on cross-lingual tasks and can achieve a better multilingual alignment.
FAD-X: Fusing Adapters for Cross-lingual Transfer to Low-Resource Languages (2022.aacl-short)

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Challenge: Adapter-based tuning is a technique that selectively updates language-specific parameters to adapt to a new language, rather than fine-tuning all shared weights.
Approach: They propose to add light-weight adapters to multilingual pretrained language models (mPLMs) and add language-specific parameters to adapt to a new language.
Outcome: The proposed adapter can enhance cross-lingual transfer from pretrained adapters for well-known named entity recognition and classification benchmarks.
MAD-G: Multilingual Adapter Generation for Efficient Cross-Lingual Transfer (2021.findings-emnlp)

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Challenge: Massively multilingual transformers (MMTs) have benefited from additional training of language-specific adapters, but this approach is not viable for the vast majority of languages due to limitations in their corpus size or compute budgets.
Approach: They propose a multilingual ADapter generation approach which contextually generates language adapters from language representations based on typological features.
Outcome: The proposed method improves cross-lingual transfer performance on part-of-speech tagging, dependency parsing, and named entity recognition tasks while remaining cost-effective.
Make the Best of Cross-lingual Transfer: Evidence from POS Tagging with over 100 Languages (2022.acl-long)

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Challenge: Existing studies on cross-lingual generalisability of large pre-trained models use English training data and test data in unseen languages.
Approach: They propose to use multilingual pre-trained models to model cross-lingual transfer in a selection of target languages.
Outcome: The proposed model can be used to improve cross-lingual transfer performance in low-resource languages with no labeled training data.
Key ingredients for effective zero-shot cross-lingual knowledge transfer in generative tasks (2024.naacl-long)

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Challenge: Existing studies have focused on zero-shot cross-lingual transfer . mBERT, mBART and mT5 provide high-quality representations for texts in various languages .
Approach: They propose to use mBART and NLLB-200 to finetune a multilingual pretrained language model on input-output pairs in one language and use it to make task predictions for inputs in other languages.
Outcome: The proposed approach significantly reduces generation in the wrong language with full finetuning and can be competitive in some cases.
ZGUL: Zero-shot Generalization to Unseen Languages using Multi-source Ensembling of Language Adapters (2023.emnlp-main)

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Challenge: Existing approaches to zero-shot cross-lingual transfer have focused on training with adapters of a single source and testing either with the target LA or LA of another related language.
Approach: They propose to leverage LAs of multiple (linguistically or geographically related) source languages for more effective cross-lingual transfer instead of just one source LA . they extend their novel neural architecture, ZGUL, to settings where either (1) some unlabeled data or (2) few-shot training examples are available for the target language .
Outcome: Extensive experimentation across four language groups, covering 15 unseen target languages, shows improvements of up to 3.2 average F1 points over baselines on POS tagging and NER tasks.
Towards Zero-Shot Multilingual Transfer for Code-Switched Responses (2023.acl-long)

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Challenge: Recent task-oriented dialog systems have had great success building English-based personal assistants, but extending these systems to a global audience may take tremendous efforts.
Approach: They propose a framework that allows for efficient transfer by learning task-specific representations and encapsulating source and target language representations.
Outcome: The proposed framework is able to successfully transfer language knowledge even when the target language corpus is limited.

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