CofiPara: A Coarse-to-fine Paradigm for Multimodal Sarcasm Target Identification with Large Multimodal Models
Summary
The paper tackles Multimodal Sarcasm Target Identification (MSTI), which means locating the mocked entity in a social-media post as both a text span and an image bounding box. Earlier end-to-end systems mostly relied on surface cues. They often failed when the sarcasm depended on implicit commonsense or background knowledge, or when the target appeared only in the image. The authors propose CofiPara, a two-stage coarse-to-fine framework. First, Large Multimodal Models (LMMs) are prompted to argue for both a sarcastic and a non-sarcastic reading of each post. A smaller language model is then pre-trained on Multimodal Sarcasm Detection (MSD), acting as a referee between these opposing rationales. This setup is meant to reduce the effect of noisy or hallucinated LMM output. Second, the pre-trained model is fine-tuned for MSTI using the sarcastic-side rationale. On two public sarcasm datasets, CofiPara reportedly beats prior state-of-the-art MSTI methods by a wide margin and is competitive with MSD baselines. The approach matters because it also produces human-readable explanations alongside the identified targets.
Key points
- The method has two phases: MSD pre-training on competing LMM-generated rationales (coarse), followed by fine-tuning for joint textual and visual target extraction (fine).
- Using opposing sarcastic and non-sarcastic rationales is the paper's way of reducing the impact of inherent LMM noise without filtering rationales explicitly.
- The authors created MSTI2.0 by automatically re-annotating and fixing errors in the first MSTI benchmark, introduced by Wang et al. (2022). MSD work in this area builds on the dataset of Cai et al. (2019) and its refined version by Qin et al. (2023).
- The authors claim to be the first to study multimodal sarcasm explainability through both visual or textual targets and natural-language rationales. Exact scores fall in the portion of the text that was not provided.
- Code is released at github.com/Lbotirx/CofiPara. Acknowledged limitations include no interpretation of the model's internal workings, dataset drift over time, and residual LMM bias and hallucination.
Cite
@inproceedings{chen2024cofipara,
title = {{CofiPara: A Coarse-to-fine Paradigm for Multimodal Sarcasm Target Identification with Large Multimodal Models}},
author = {Chen, Zixin and Lin, Hongzhan and Luo, Ziyang and Cheng, Mingfei and Ma, Jing and Chen, Guang},
booktitle = {Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
year = {2024},
doi = {10.18653/v1/2024.acl-long.522},
url = {https://doi.org/10.18653/v1/2024.acl-long.522}
}References
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