A Report on the 2020 VUA and TOEFL Metaphor Detection Shared Task
Summary
This report covers the second shared task on token-level metaphor detection, held at the ACL 2020 Workshop on Figurative Language Processing as a follow-up to the 2018 edition. Systems had to label every content word (nouns, verbs, adjectives, adverbs, excluding forms of be/do/have) as metaphorical or literal. There were four tracks: All POS and Verbs-only, each run on the VU Amsterdam Metaphor Corpus (VUA) and on a metaphor-annotated subset of the TOEFL learner-essay corpus. The organizers released the data, scripts and features, and provided three baselines: a feature-based classifier, the 2018 bot.zen BiLSTM, and fine-tuned BERT. Submissions were scored on CodaLab by F1 for the metaphor class. Thirteen teams wrote system papers, and most relied on contextual embeddings such as BERT, RoBERTa and ELMo. Some teams combined these with linguistic features, ensembles or Transformer stacks. The authors also broke results down by proficiency level and part of speech. For VUA, these breakdowns reproduced the 2018 patterns, while learner essays behaved quite differently. The task establishes a reusable benchmark for metaphor detection on both native and non-native text.
Key points
- VUA data: 117 BNC fragments from four genres (Academic, News, Conversation, Fiction), annotated with MIPVU at κ > 0.8. Metaphor rates are 29% for Verbs and 18% for All POS.
- TOEFL data: 240 essays (180 train / 60 test) taken from the ETS Corpus of Non-Native Written English. They cover 8 prompts, 3 native languages (Japanese, Italian, Arabic) and 2 proficiency levels. Annotation targeted argumentation-relevant metaphors with κ = 0.56–0.62. Metaphor rates are only 13% for Verbs and 7% for All POS.
- Participation: VUA All POS drew 13 teams and 210 submissions; TOEFL All POS drew 9 teams and 247 submissions. Teams could submit at most 5 times per day per track and up to 12 final systems.
- Best All-POS F1 in the per-POS breakdown: DeepMet scored .769 on VUA and .715 on TOEFL. The BERT baseline reached .718 on VUA and .624 on TOEFL.
- POS patterns:
- On VUA, Verbs were easiest and Adverbs hardest, with an average gap of about 11 F1 points.
- On TOEFL, Adjectives usually came out on top and Nouns were hardest for every system, with an average gap of 17 points.
- The best TOEFL Nouns score was just 0.641.
Interesting ideas
- I1. Break results down by subgroup, not just overall. Slicing scores by proficiency level and by part of speech exposes where systems fail. For example, nominal metaphors turned out to be rare and hard in learner text. Any shared task or benchmark would benefit from such breakdowns.
- I2. Train on the broader task, then evaluate on the narrower one. The BERT baseline for the Verbs tracks was tuned on All POS data and tested on verbs, which worked better than training on verbs alone. This can help whenever a sub-task has too little data.
- I3. Combine pretrained embeddings with hand-crafted lexical features. illiniMet concatenated RoBERTa vectors with WordNet, VerbNet and concreteness features, then took a majority vote over models trained on different data splits. This is a cheap way to inject lexical knowledge and reduce variance.
- I4. Frame token tagging as reading comprehension. DeepMet treated each word as a query and fed in global context, local context and POS. Its ablations showed that fine-grained POS and global context mattered most. This query-style framing could carry over to other word-level semantic tagging tasks.
- I5. Check the effect of the prompt or domain. Prompts that themselves suggest a metaphor inflate metaphor frequency in the essays written for them. It is worth controlling for task-induced data patterns when collecting and evaluating any learner or crowd corpus.
Topics Idioms & multiword expressions
Cite
Cite as Chee Wee (Ben) Leong, Beata Beigman Klebanov, Chris Hamill, Egon Stemle, Rutuja Ubale and Xianyang Chen. 2020. A Report on the 2020 VUA and TOEFL Metaphor Detection Shared Task. Proceedings of the Second Workshop on Figurative Language Processing.
@inproceedings{leong2020report,
title = {{A Report on the 2020 VUA and TOEFL Metaphor Detection Shared Task}},
author = {Chee Wee (Ben) Leong, Beata Beigman Klebanov, Chris Hamill, Egon Stemle, Rutuja Ubale and Xianyang Chen},
booktitle = {Proceedings of the Second Workshop on Figurative Language Processing},
year = {2020},
doi = {10.18653/v1/2020.figlang-1.3},
url = {https://doi.org/10.18653/v1/2020.figlang-1.3}
}References
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