Challenge: Large Language Models (LLMs) have been evaluated as second-stage reranking models for monolingual IR, but a systematic comparison is lacking for cross-lingual reranked IR.
Approach: They propose to use machine translation to evaluate rerankers in cross-lingual IR . they find that LLMs perform better than LLM-based reranked models .
Outcome: The proposed model improves cross-lingual IR but relies on machine translation for the first stage.

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Zero-Shot Cross-Lingual Reranking with Large Language Models for Low-Resource Languages (2024.acl-short)

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Challenge: Large language models (LLMs) have shown impressive zero-shot capabilities in various passage ranking tasks.
Approach: They analyze and compare the effectiveness of monolingual reranking using query or document translations and evaluate the effectiveness when leveraging their own generated translations.
Outcome: The proposed models perform better when using their own translations than when using query or document translations.
The Challenges of Optimizing Machine Translation for Low Resource Cross-Language Information Retrieval (D19-1)

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Challenge: Existing studies do not investigate the effectiveness of MT metrics in predicting performance of downstream IR models.
Approach: They examine the relationship between MT performance and IR quality in a CLIR-based system . they find that the choice of IR collection can significantly affect MT tuning decisions .
Outcome: The proposed model can predict CLIR performance better from MT quality, the authors show . the proposed model is based on a BLEU-based model with a bag of words constraint .
How Good are LLM-based Rerankers? An Empirical Analysis of State-of-the-Art Reranking Models (2025.findings-emnlp)

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Challenge: a systematic and comprehensive empirical evaluation of state-of-the-art reranking methods is presented.
Approach: They evaluate 22 reranking methods including 40 variants across established benchmarks . primary goal is to determine whether performance disparity exists between LLM-based reranters and lightweight counterparts based on novel queries .
Outcome: The proposed methods perform better on familiar queries than lightweight models, the authors show .
Cross-Lingual Learning-to-Rank with Shared Representations (N18-2)

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Challenge: Cross-lingual information retrieval (CLIR) is a document retrieval task where the documents are written in a language different from that of the user's query.
Approach: They propose a large-scale dataset derived from Wikipedia to support CLIR research in 25 languages.
Outcome: The proposed model can improve the results of Swahili-English CLIR in Japanese and Japanese.
Benchmarking and Improving Long-Text Translation with Large Language Models (2024.findings-acl)

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Challenge: Recent studies have illuminated the promising capabilities of large language models (LLMs) in handling long texts.
Approach: They construct a benchmark dataset specifically designed for the finetuning and evaluation of large language models (LLMs) they compare LLMs with MT models and find they exhibit shortcomings in long-text domains .
Outcome: The proposed model performs better in long-text translation, and its performance diminishes as document size increases.
Are Large Language Model-based Evaluators the Solution to Scaling Up Multilingual Evaluation? (2024.findings-eacl)

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Challenge: Large Language Models (LLMs) excel in various tasks, but their evaluation, especially in languages beyond the top 20, remains inadequate due to existing benchmarks and metrics limitations.
Approach: They propose to use Large Language Models as evaluators to rank or score other models’ outputs by calibrating them against 20K human judgments across three text-generation tasks, five metrics, and eight languages.
Outcome: The proposed evaluation methods can be used to improve multilingual evaluation by calibrating them against 20K human judgments across three text-generation tasks, five metrics, and eight languages.
Large Language Model Is Not a Good Few-shot Information Extractor, but a Good Reranker for Hard Samples! (2023.findings-emnlp)

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Challenge: Large Language Models have made remarkable strides in various tasks, but whether they are competitive few-shot solvers remains an open question.
Approach: They propose an adaptive filter-then-rerank paradigm to combine the strengths of LLMs and SLMs.
Outcome: The proposed system achieves promising improvements on various IE tasks with acceptable time and cost investment.
1+1>2: Can Large Language Models Serve as Cross-Lingual Knowledge Aggregators? (2024.emnlp-main)

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Challenge: Large Language Models (LLMs) have been recognized for their impressive capabilities in natural language processing (NLP).
Approach: They propose a method to enhance the multilingual performance of Large Language Models by aggregating knowledge from diverse languages.
Outcome: The proposed method reduces the performance disparity across languages and offers valuable insights for further exploration.
Learning Cross-Lingual IR from an English Retriever (2022.naacl-main)

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Challenge: DR.DECR is a cross-lingual information retrieval system trained using multi-stage knowledge distillation (KD) DRDECR demonstrates superior accuracy over direct fine-tuning with labeled CLIR data.
Approach: They propose a cross-lingual information retrieval system with multi-stage knowledge distillation . they teach powerful multilingual representations and CLIR by optimizing two corresponding KD objectives .
Outcome: The proposed system is the best single-model retriever on the XOR-TyDi benchmark . it is based on a multi-stage knowledge distillation process that can be expensive .
Do Large Language Models Rank Fairly? An Empirical Study on the Fairness of LLMs as Rankers (2024.naacl-long)

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Challenge: Recent studies have shown that Large Language Models (LLMs) are more efficient in natural language understanding tasks.
Approach: They evaluate large language models (LLMs) using a TREC Fair Ranking dataset . they assess fairness from both user and content perspectives .
Outcome: The proposed model outperforms the existing models in the fair ranking task.

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