Papers by Aitor Ormazabal
Analyzing the Limitations of Cross-lingual Word Embedding Mappings (P19-1)
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| Challenge: | Existing methods for cross-lingual word embeddings have limited results . existing methods require little or no cross-linguistic signal to work . |
| Approach: | They compare offline mapping methods to an extension of skip-gram that jointly learns both embedding spaces. |
| Outcome: | The proposed method yields more isomorphic embeddings, is less sensitive to hubness, and achieves stronger results in bilingual lexicon induction. |
Principled Paraphrase Generation with Parallel Corpora (2022.acl-long)
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| Challenge: | a popular method for paraphrase generation is round-trip machine translation (MT). |
| Approach: | They propose a method that formalizes the implicit similarity function and relaxes it by requiring the entire translation distribution to match . they propose MT can be used to generate paraphrases by decoding back to the source without having to generate pivot translations. |
| Outcome: | The proposed approach is more principled and efficient than round-trip machine translation (MT) and offers an adjustable parameter to control the fidelity-diversity trade-off. |
CombLM: Adapting Black-Box Language Models through Small Fine-Tuned Models (2023.emnlp-main)
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| Challenge: | Methods for adapting language models to new tasks and domains have traditionally assumed white-box access to the model and work by modifying its parameters. |
| Approach: | They propose a method for adapting large language models to new domains and tasks . they fine-tune a small white-box LM and combine it with a large black-box model at the probability level through a network, learned on a smaller validation set. |
| Outcome: | The proposed method improves performance in all cases, while using a domain expert 23x smaller. |
Improving the Efficiency of Visually Augmented Language Models (2025.coling-main)
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| Challenge: | Autoregressive Language Models lack visual knowledge due to reporting bias in textual corpora. |
| Approach: | They propose to use visual representations obtained from CLIP multimodal system to augment autoregressive language models with visual knowledge. |
| Outcome: | The proposed model outperforms VALM for visual language understanding, natural language understanding and language modeling tasks despite being significantly more efficient and simpler. |
PoeLM: A Meter- and Rhyme-Controllable Language Model for Unsupervised Poetry Generation (2022.findings-emnlp)
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| Challenge: | Existing methods for generating formal verse poetry use existing poems for supervision, which are difficult to obtain for most languages and poetic forms. |
| Approach: | They propose an unsupervised approach to generate formal verse poetry without supervision . they use control codes to describe meter and rhyme scheme constraints, and train a transformer language model . |
| Outcome: | The proposed method generates poems that follow any given meter and rhyme scheme without training . it is comparable to those written by humans and generates comparable quality poems . |
Beyond Offline Mapping: Learning Cross-lingual Word Embeddings through Context Anchoring (2021.acl-long)
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| Challenge: | Recent research on cross-lingual word embeddings has been dominated by unsupervised mapping approaches that align monolingual embedders. |
| Approach: | They propose an unsupervised mapping approach that fixes fixed embeddings and learns new ones for the source language that are aligned with them. |
| Outcome: | The proposed method outperforms conventional mapping methods on bilingual lexicon induction and obtains competitive results in the downstream XNLI task. |