A Novel Noise Filtering Algorithm for Imbalanced Data

Noise filtering is a commonly-used methodology to improve the performance of learners built using low-quality data. A common type of noise filtering is a data preprocessing technique called classification filtering. In classification filtering, a classifier is built and evaluated on the training dataset (typically using cross-validation) and any misclassified instances are considered noisy. The strategies employed with classification filters are not ideal, particularly when learning from class-imbalanced data. To address this deficiency, we propose an alternative method for classification filtering called the threshold-adjusted classification filter. This methodology is compared with the standard classification filter, and the results clearly demonstrate the efficacy of our technique.