Tree LSTMs with Convolution Units to Predict Stance and Rumor Veracity in Social Media Conversations

Sumeet Kumar, Kathleen Carley


Abstract
Learning from social-media conversations has gained significant attention recently because of its applications in areas like rumor detection. In this research, we propose a new way to represent social-media conversations as binarized constituency trees that allows comparing features in source-posts and their replies effectively. Moreover, we propose to use convolution units in Tree LSTMs that are better at learning patterns in features obtained from the source and reply posts. Our Tree LSTM models employ multi-task (stance + rumor) learning and propagate the useful stance signal up in the tree for rumor classification at the root node. The proposed models achieve state-of-the-art performance, outperforming the current best model by 12% and 15% on F1-macro for rumor-veracity classification and stance classification tasks respectively.
Anthology ID:
P19-1498
Volume:
Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics
Month:
July
Year:
2019
Address:
Florence, Italy
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
5047–5058
URL:
https://www.aclweb.org/anthology/P19-1498
DOI:
10.18653/v1/P19-1498
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PDF:
https://www.aclweb.org/anthology/P19-1498.pdf