CAUnLP at NLP4IF 2019 Shared Task: Context-Dependent BERT for Sentence-Level Propaganda Detection
Wenjun Hou, Ying Chen · 2019
The goal of fine-grained propaganda detection is to determine whether a given sentence uses propaganda techniques (sentence-level) or to recognize which techniques are used (fragment-level).This paper presents the system of our participation in the sentence-level subtask of the propaganda detection shared task.In order to better utilize the document information, we construct context-dependent input pairs (sentence-title pair and sentencecontext pair) to fine-tune the pretrained BERT, and we also use the undersampling method to tackle the problem of imbalanced data 1 .