Papers by Alexandra Chronopoulou
An Embarrassingly Simple Approach for Transfer Learning from Pretrained Language Models (N19-1)
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| Challenge: | Existing transfer learning methods employ language models pretrained on large generic corpora, but results come at a high computational cost and require task-specific architectures. |
| Approach: | They propose a transfer learning approach that combine a task-specific optimization function with an auxiliary language model objective, which is adjusted during the training process. |
| Outcome: | The proposed method surpasses well established transfer learning methods with greater level of complexity on a variety of affective and text classification tasks surpassing well established methods with higher level of difficulty. |
m^4 Adapter: Multilingual Multi-Domain Adaptation for Machine Translation with a Meta-Adapter (2022.findings-emnlp)
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| Challenge: | Multilingual neural machine translation models (MNMT) are effective on transferring knowledge between high-resource languages to low-resourced languages. |
| Approach: | They propose a multilingual multi-domain adapter which combines domain and language knowledge using meta-learning with adapters. |
| Outcome: | The proposed model outperforms other adapter methods in a domain shift and language pair translation task. |
Mitigating Data Imbalance and Representation Degeneration in Multilingual Machine Translation (2023.findings-emnlp)
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| Challenge: | Existing approaches to multilingual neural machine translation (MNMT) are limited in their ability to handle large amounts of data. |
| Approach: | They propose a framework which only requires target-side monolingual data and a bilingual dictionary to improve the performance of the MNMT model. |
| Outcome: | The proposed framework is more effective than baselines in long-tail and high-resource languages. |
Efficient Hierarchical Domain Adaptation for Pretrained Language Models (2022.naacl-main)
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| Challenge: | Existing methods to allow domain adaptation to diverse domains are expensive and require continuing training in-domain. |
| Approach: | They propose a method to permit domain adaptation to many diverse domains using a computationally efficient adapter approach. |
| Outcome: | The proposed method allows domain adaptation to many diverse domains while avoiding negative interference between unrelated domains. |
Improving the Lexical Ability of Pretrained Language Models for Unsupervised Neural Machine Translation (2021.naacl-main)
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| Challenge: | Existing methods for unsupervised neural machine translation (UNMT) use cross-lingual pretraining to align the lexical- and high-level representations of two languages. |
| Approach: | They propose to use type-level cross-lingual subword embeddings to enhance the bilingual masked language model pretraining with lexical-level information to align the two languages. |
| Outcome: | Empirical results show that the method improves on UNMT (up to 4.5 BLEU) and bilingual lexicon induction compared to baseline models. |
AdapterSoup: Weight Averaging to Improve Generalization of Pretrained Language Models (2023.findings-eacl)
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| Challenge: | Pretrained language models often need to specialize to specific domains. |
| Approach: | They propose an approach that performs weight-space averaging of adapters trained on different domains. |
| Outcome: | The proposed approach improves performance to new domains without extra training. |
Do LLMs Really Need 10+ Thoughts for “Find the Time 1000 Days Later”? Towards Structural Understanding of LLM Overthinking (2026.acl-long)
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Xinliang Frederick Zhang, Anhad Mohananey, Alexandra Chronopoulou, Pinelopi Papalampidi, Somit Gupta, Tsendsuren Munkhdalai, Lu Wang, Shyam Upadhyay
| Challenge: | Existing studies on LLMs' thought processes are limited to superficial, profiling-based observations, failing to delve into their inner workings. |
| Approach: | They propose a utility-based definition of overthinking that moves beyond length-based metrics and provides a more insightful understanding of LLMs' thought progression. |
| Outcome: | The proposed model decomposes the LLM thought process into minimally complete sub-thoughts and identifies common thinking patterns for topically similar queries. |
Reusing a Pretrained Language Model on Languages with Limited Corpora for Unsupervised NMT (2020.emnlp-main)
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| Challenge: | Neural machine translation (NMT) models with limited data are ineffective when the two languages are not available for one language. |
| Approach: | They propose an approach that reuses a language model that is pretrained on two languages with large monolingual data to initialize an unsupervised neural machine translation system. |
| Outcome: | The proposed method outperforms a competitive cross-lingual pretraining model in English-Macedonian (En-Mk) and English-Albanian (En Sq) it yields more than +8.3 BLEU points for all four translation directions. |
Domain Adversarial Fine-Tuning as an Effective Regularizer (2020.findings-emnlp)
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| Challenge: | Existing fine-tuning techniques can degrade general-domain representations . however, fine-timing can lead to catastrophic forgetting of knowledge . |
| Approach: | They propose a new regularization technique that complements the task-specific loss used during fine-tuning with an adversarial objective. |
| Outcome: | Empirical results show that AFTER improves performance on various natural language understanding tasks compared to standard fine-tuning. |