Browsing by Author "Dey, Sarbajit"

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    Learning with Long-Tailed Noisy Labels
    (Indian Statistical Institute, Kolkata, 2024-06) Dey, Sarbajit
    Deep neural networks (DNNs) have shown exceptionally good performance in a variety of activities by using correctly labelled and ’good’ training datasets. These remarkable results, however, are mostly observed with datasets that are carefully controlled and precisely structured. Conversely, data obtained from real-world applications frequently encounter substantial problems that are not commonly found in these ’good’ datasets. Two common biases frequently found in real-world data are: (i) long-tailed class distribution, where a small number of classes have a significant number of instances while the rest have only a few, and (ii) label noise, which refers to inaccuracies and errors in the assigned data labels. When learning models are specifically built to address only one of these biases, either by focusing on the long-tailed nature of the data or on the noise in the labels, their performance declines when they come across data that has both long-tailed distribution and noisy labels, which is a very common occurrence in real-world applications. This work investigates the complex issue of learning from datasets with long-tailed label noise. In real-world problems such as autonomous driving, medical diagnosis, and large-scale user-generated content platforms, the data obtained frequently shows these properties. Therefore, it is essential to create strong learning algorithms that can successfully address both problems at the same time. Our objective is to study and make meaningful contributions to the progress of deep learning methods that can effectively handle real-world data difficulties while being robust and dependable. We study the current methods for handling these learning problems, focuse on their shortcomings and try to improve the same. We propose Median of Means for centroid estimation on a clean subset of the dataset. We then use the SFA framework and Semi supervised learning for classification task on imbalanced noisy labels.