Augmenting FrameNet Via PPDB
Summary
FrameNet, the lexico-semantic resource based on frame semantics, has limited lexical coverage. Many words that should trigger a frame are missing, so parsers such as SEMAFOR need test-time heuristics for out-of-vocabulary items. Rastogi and Van Durme instead enlarge the training data. They take lexical rules from PPDB, The Paraphrase Database, and substitute paraphrases for single-word targets in FrameNet's fulltext annotated sentences. A 5-gram Kneser-Ney language model, built with KenLM on Annotated Gigaword, ranks the rewritten sentences.
They ran two setups. The first queried PPDB directly with each target word. The second first pooled lexical units from frames connected by inheritance, perspective or subframe relations, which yields far more candidates. They also measured what PPDB adds beyond WordNet synonyms. In a manual check of 25 paraphrase sets, the top three PPDB XL rewrites were grammatical and evoked the correct frame about 65% of the time, while roughly tripling coverage. A parser could therefore retrain on the expanded data instead of relying on OOV-handling tricks.
Key points
- The input was FrameNet v1.5 (1,019 frames), whose fulltext portion has 4,026 sentences with 23,921 targets. Of these, 23,226 single-token targets were paraphrased.
- Pooling lexical units across related frames (Experiment 2) raises the average lexical units per frame from 20.24 in FrameNet to 214.99 with PPDB XL.
- After removing WordNet v3.0 synonyms, Experiment 1 still produced 283,126 new paraphrases with PPDB XL. Experiment 2 produced about 2.35 million with PPDB L.
- With PPDB XL and only the top three language-model-ranked outputs kept, 65.27% of rewrites were fully correct (right frame and grammatical), and 87.5% evoked the correct frame.
- The main errors came from single-token triggers that belong to multi-word expressions and from noisy PPDB entries. The generated corpus and the manual annotations were publicly released.
Cited by
- FrameNet+: Fast Paraphrastic Tripling of FrameNet
- Inference is Everything: Recasting Semantic Resources into a Unified Evaluation Framework
- From Paraphrase Database to Compositional Paraphrase Model and Back
Cite
@inproceedings{rastogi2014augmenting,
title = {{Augmenting FrameNet Via PPDB}},
author = {Rastogi, Pushpendre and Durme, Benjamin Van},
booktitle = {Proceedings of the Second Workshop on EVENTS: Definition, Detection, Coreference, and Representation},
year = {2014},
doi = {10.3115/v1/w14-2901},
url = {https://doi.org/10.3115/v1/w14-2901}
}References
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