Zero-Shot Cross-Lingual Retrieval Degradation on Low-Resource Languages via Artificial Code-Switching

Transferring information retrieval (IR) models from a high-resource language (typically English) to other languages in a zero-shot fashion has become a widely adopted approach. In this work, we show that the effectiveness of zero-shot rankers diminishes when queries and documents are present in different languages. Motivated by this, we propose to train ranking models on artificially code-switched data instead, which we generate by utilizing bilingual lexicons. To this end, we experiment with lexicons induced from (1) cross-lingual word embeddings and (2) parallel Wikipedia page titles. We use

Research goal: How does the zero-shot cross-lingual retrieval performance of models trained on artificially code-switched data degrade when evaluated on low-resource languages not present in the seed lexicon, as measured by nDCG@5 on the FiQA-2020 benchmark?

Autonomous synthesis report generated by Assignee Research. Tribunal consensus score: 8.2/10.