UOR at SemEval-2021 Task 12: On Crowd Annotations; Learning with Disagreements to optimise crowd truth
Emmanuel Osei-Brefo, Thanet Markchom, Huizhi Liang · 2021
Crowdsourcing has been ubiquitously used for annotating enormous collections of data.However, the major obstacles to using crowdsourced labels are noise and errors from nonexpert annotations.In this work, two approaches dealing with the noise and errors in crowd-sourced labels are proposed.The first approach uses Sharpness-Aware Minimization (SAM), an optimization technique robust to noisy labels.The other approach leverages a neural network layer called softmax-Crowdlayer specifically designed to learn from crowd-sourced annotations.According to the results, the proposed approaches can improve the performance of the Wide Residual Network model and Multi-layer Perception model applied on crowd-sourced datasets in the image processing domain.It also has similar and comparable results with the majority voting technique when applied to the sequential data domain whereby the Bidirectional Encoder Representations from Transformers (BERT) is used as the base model in both instances.