Retrieval of the Best Counterargument without Prior Topic Knowledge
Summary
The paper addresses how to retrieve the most fitting counterargument for an arbitrary argument when nothing is known in advance about its topic. The authors' hypothesis is that a strong counterargument talks about the same aspects as the original argument but takes the opposing side. They turn this into an unsupervised ranking model. The model scores each candidate in two ways at once. A topic-similarity component rewards overlap with the argument. A stance-dissimilarity component penalizes candidates that are too close to either the argument's conclusion or its premises. Both components use word-based and embedding-based similarities.
For evaluation, they built the ArguAna Counterargs corpus from idebate.org, where each point is paired with a dedicated counter. From this corpus they defined eight retrieval tasks that differ in which candidates compete. Their best configuration consistently outperforms standard similarity baselines. Even when every test argument is a candidate, it ranks the true counter first roughly one time in three. This suggests that useful counterarguments can often be found without topic knowledge, which matters for debating technologies and argument search engines such as args.
Key points
- Corpus: ArguAna Counterargs contains 6753 argument–counterargument pairs from 1069 idebate.org debates, grouped into 15 themes, plus millions of derived false pairs. The corpus and Java code are released at arguana.com.
- Gains over baselines: The proposed variants (we, we↓, we↑) beat plain word and embedding similarity by about 8–10 accuracy points in every task. They also beat the strongest baseline in each task by at least 3 points.
- Same-debate setting: Among opposing-stance arguments from the same debate (7.6 candidates on average), the we variant ranks the true counter first in 60.3% of cases. The we↑ variant reaches 74.5% when only opposing counters are candidates.
- Full test set: When the candidate pool includes the entire set of 2801 test arguments, the we↑ variant achieves 32.4% accuracy@1, a mean rank of 15, and an MRR of 0.5. The best baseline (w+) reaches 28.6% accuracy@1 with a mean rank of 33.
- Variation by theme: Results differ notably across themes. On the full-portal task, we↑ ranges from 12.1% accuracy@1 for free speech debates, whose arguments tend to be unusually long, to 46.7% for sport, whose topics are very specific.
Cited by
- Task-aware Retrieval with Instructions
- Argument Mining: A Survey
- NV-Embed: Improved Techniques for Training LLMs as Generalist Embedding Models
- Large Language Models are Effective Text Rankers with Pairwise Ranking Prompting
- Classification and Clustering of Arguments with Contextualized Word Embeddings
- ColBERTv2: Effective and Efficient Retrieval via Lightweight Late Interaction
- BEIR: A Heterogenous Benchmark for Zero-shot Evaluation of Information Retrieval Models
- Text Embeddings by Weakly-Supervised Contrastive Pre-training
- Large Language Models for Information Retrieval: A Survey
Cite
@inproceedings{wachsmuth2018retrieval,
title = {{Retrieval of the Best Counterargument without Prior Topic Knowledge}},
author = {Wachsmuth, Henning and Syed, Shahbaz and Stein, Benno},
booktitle = {Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
year = {2018},
doi = {10.18653/v1/p18-1023},
url = {https://doi.org/10.18653/v1/p18-1023}
}References
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