Challenge: a lack of data in low-resource languages has limited the performance of a multilingual pre-trained model.
Approach: They propose a continuous pre-training framework to adapt mBART to unseen languages . they construct noisy mixed-language text from the monolingual corpus of the target language .
Outcome: The proposed framework improves finetuning performance on low-resource translation pairs . the proposed framework also improves on translation pairs where both languages are seen .

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Pre-Trained Multilingual Sequence-to-Sequence Models: A Hope for Low-Resource Language Translation? (2022.findings-acl)

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Challenge: Pre-trained multilingual sequence-to-sequence models like mBART and mT5 can be used to translate low-resource languages, but their practical application is unclear.
Approach: They conduct an empirical experiment in 10 languages to determine what can pre-trained multilingual sequence-to-sequence models like mBART do to translate low-resource languages?
Outcome: The proposed models are robust to domain differences, but translations for unseen and typologically distant languages remain below 3.0 BLEU.
Breaking Language Barriers: Cross-Lingual Continual Pre-Training at Scale (2024.emnlp-main)

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Challenge: Large Language Models (LLMs) have made significant strides towards Artificial General Intelligence, but training them from scratch is prohibitively expensive.
Approach: They propose to continuously pre-train LLMs from existing pre-trained LLM models by using a set of parameters instead of randomly initializing them.
Outcome: The proposed approach saves significant resources and accelerates convergence and performance.
Multilingual Neural Machine Translation (2020.coling-tutorials)

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Challenge: In this tutorial, we will cover the latest advances in NMT to enhance low-resource translation.
Approach: They will cover the latest advances in NMT approaches that leverage multilingualism . they will focus on topics such as language divergence, transfer learning and pivoting .
Outcome: This tutorial will cover the latest advances in NMT to enhance low-resource translation models.
Disentangling Pretrained Representation to Leverage Low-Resource Languages in Multilingual Machine Translation (2024.lrec-main)

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Challenge: Multilingual neural machine translation requires an enormous dataset, leaving the low-resource language (LRL) underdeveloped.
Approach: They evaluated five languages using a parallel corpus of 1,000 instances each and found a zero-shot improvement of 7.4 from the baseline score of 7.1 to a score of 15.5 at best.
Outcome: The proposed model improves performance in the linguistically diverse country of Indonesia by 7.4 from baseline score of 7.1 to 15.5 at best.
Multilingual Denoising Pre-training for Neural Machine Translation (2020.tacl-1)

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Challenge: Existing approaches to pre-train models focus on only English corpora, but this is not common in machine translation.
Approach: They propose a sequence-to-sequence denoising auto-encoder pre-trained on monolingual corpora . they show that it produces significant performance gains across MT tasks .
Outcome: The proposed model can achieve significant performance gains across a wide variety of MT tasks.
Efficient Continual Pre-training of LLMs for Low-resource Languages (2025.naacl-industry)

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Challenge: Open-source large language models (LLMs) are a promising tool for low-resource languages . however, there is still a substantial performance gap between high-resourced languages and LRLs .
Approach: They develop an algorithm to select a subset of texts from a larger corpus and use it to select tokens for LLMs.
Outcome: The proposed algorithm reduces the cost of continual pre-training (CPT) with large amounts of language-specific data.
Towards Effective and Efficient Continual Pre-training of Large Language Models (2025.acl-long)

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Challenge: Continual pre-training (CPT) has been an important approach for adapting language models to specific domains or tasks.
Approach: They propose a Continual pre-training method that can greatly improve Chinese language ability and scientific reasoning ability of LLMs.
Outcome: The proposed method can greatly improve Chinese language ability and scientific reasoning ability of LLMs.
Continued Pretraining and Interpretability-Based Evaluation for Low-Resource Languages: A Galician Case Study (2025.findings-acl)

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Challenge: Recent advances in large language models have led to remarkable improvements in language understanding and text generation.
Approach: They propose a framework to evaluate large language models for underrepresented languages . they examine CPT strategies for languages with limited representation in multilingual models .
Outcome: The proposed evaluation framework is based on the case of Galician language . it assesses trade-offs between linguistic enrichment and task-solving capabilities .
Pivot-based Transfer Learning for Neural Machine Translation between Non-English Languages (D19-1)

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Challenge: Using parallel corpora, we train a single, direct NMT model for non-English language pairs.
Approach: They propose three ways to increase the relation among source, pivot, and target languages in pre-training . they use additional adapter component to smoothly connect pre-trained encoder and decoder .
Outcome: The proposed methods outperform multilingual models up to +2.6% BLEU in WMT 2019 French-German and German-Czech tasks.
Leveraging Monolingual Data with Self-Supervision for Multilingual Neural Machine Translation (2020.acl-main)

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Challenge: Existing multilingual NMT approaches do not utilize the abundance of monolingual data, especially in low-resource languages.
Approach: They propose to combine monolingual data with self-supervision to pre-train translation models and fine-tune on small amounts of supervised data.
Outcome: The proposed approach improves translation quality of low-resource languages and zero-shot translation quality.

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