Prof. Advaith Siddharthan Profile

Prof. Advaith Siddharthan

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Proceedings Article | 7 June 2023 Paper

Confidence-aware calibration and scoring functions for curriculum learning

Shuang Ao, Stefan Rueger, Advaith Siddharthan

Proceedings Volume 12701, 127011U (2023) https://doi.org/10.1117/12.2679353

KEYWORDS: Education and training, Machine learning, Calibration, Statistical modeling, Image classification, Electrochemical etching, Data modeling, Performance modeling, Emotion, Transformers

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Despite the great success of state-of-the-art deep neural networks, several studies have reported models to be over-confident in predictions, indicating miscalibration. Label Smoothing has been proposed as a solution to the over-confidence problem and works by softening hard targets during training, typically by distributing part of the probability mass from a ‘one-hot’ label uniformly to all other labels. However, neither model nor human confidence in a label are likely to be uniformly distributed in this manner, with some labels more likely to be confused than others. In this paper we integrate notions of model confidence and human confidence with label smoothing, respectively Model Confidence LS and Human Confidence LS, to achieve better model calibration and generalization. To enhance model generalization, we show how our model and human confidence scores can be successfully applied to curriculum learning, a training strategy inspired by learning of ‘easier to harder’ tasks. A higher model or human confidence score indicates a more recognisable and therefore easier sample, and can therefore be used as a scoring function to rank samples in curriculum learning. We evaluate our proposed methods with four state-of-the-art architectures for image and text classification task, using datasets with multi-rater label annotations by humans. We report that integrating model or human confidence information in label smoothing and curriculum learning improves both model performance and model calibration. The code are available at https://github.com/AoShuang92/Confidence Calibration CL.

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