Iterative Misclassification Error Training (IMET): An Optimized Neural Network Training Technique for Image Classification

TL;DR

IMET is a new training framework that combines ideas from curriculum learning and coreset selection to improve neural network robustness and accuracy in medical image classification, especially with noisy or small datasets.

Contribution

The paper introduces IMET, a novel training method that identifies misclassified samples to focus learning on edge cases, enhancing medical image classification performance.

Findings

IMET improves accuracy on benchmark datasets.

IMET enhances model robustness against noisy labels.

IMET reduces training time while maintaining performance.

Abstract

Deep learning models have proven to be effective on medical datasets for accurate diagnostic predictions from images. However, medical datasets often contain noisy, mislabeled, or poorly generalizable images, particularly for edge cases and anomalous outcomes. Additionally, high quality datasets are often small in sample size that can result in overfitting, where models memorize noise rather than learn generalizable patterns. This in particular, could pose serious risks in medical diagnostics where the risk associated with mis-classification can impact human life. Several data-efficient training strategies have emerged to address these constraints. In particular, coreset selection identifies compact subsets of the most representative samples, enabling training that approximates full-dataset performance while reducing computational overhead. On the other hand, curriculum learning relies on gradually increasing training difficulty and accelerating convergence. However, developing a generalizable difficulty ranking mechanism that works across diverse domains, datasets, and models while reducing the computational tasks and remains challenging. In this paper, we introduce Iterative Misclassification Error Training (IMET), a novel framework inspired by curriculum learning and coreset selection. The IMET approach is aimed to identify misclassified samples in order to streamline the training process, while prioritizing the model's attention to edge case senarious and rare outcomes. The paper evaluates IMET's performance on benchmark medical image classification datasets against state-of-the-art ResNet architectures. The results demonstrating IMET's potential for enhancing model robustness and accuracy in medical image analysis are also presented in the paper.