Detection of clean samples in noisy labelled datasets via analysis of artificially corrupted samples

Yıldırım, Botan
Recent advances in supervised deep learning methods have shown great successes in image classification but these methods are known to owe their success to massive amount of data with reliable labels. However, constructing large-scale datasets inevitably results with varying levels of label noise which degrades performance of the supervised deep learning based classifiers. In this thesis, we make an analysis of sample selection based label noise robust approaches by providing extensive experimental evaluation. First, adverse effects of memorization of the noisy samples are investigated over results of a base model. Second, importance of knowledge of noise rate is analyzed for approaches utilizing a prior about noise rate. Third, superiority of recent semi-supervised based robust approaches over supervised ones is proved. Additionally, synthetically corrupted controlled datasets are used to show effects of the noise rate over training performance. Finally, a new framework is proposed to classify samples as clean or noisy by investigating train loss dynamics. To avoid heavily tuned parameters during clean sample detection, proposed framework artificially corrupts a noisy dataset and utilizes these artificially corrupted samples in a clean/noisy voting process. Moreover, following recent semi-supervised learning based label noise robust methods, framework applies semi-supervised and contrastive learning after classification of samples as clean-noisy. Also, effect of the co-training approach during semi-supervised learning is investigated and its effectiveness is proved.


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Citation Formats
B. Yıldırım, “Detection of clean samples in noisy labelled datasets via analysis of artificially corrupted samples,” M.S. - Master of Science, Middle East Technical University, 2022.