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Faray Juan Tody
Department of Computer Science, Universitas Amikom Yogyakarta, Indonesia

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Efficient Pneumonia Detection with MobileNetV2 Through a Staged Optimization Pipeline and Grad-CAM Interpretability Evaluation Faray Juan Tody; Majid Rahardi
Journal of Information System Exploration and Research Vol. 4 No. 4: October 2026
Publisher : SHM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52465/joiser.v4i4.127

Abstract

Pneumonia remains a major cause of morbidity and mortality, and chest X-ray screening in resource-constrained settings could benefit from lightweight deep learning models. This study provides an integrated evaluation of established techniques, adaptive histogram standardization (AHS), automatic mixed-precision (AMP) training, and FP16 post-training quantization, applied to a MobileNetV2-based pneumonia classifier, using a four-scenario ablation design with repeated hold-out validation across three seeds. The selected model of each scenario reached 91.03–91.42% test accuracy, and peak validation accuracy across seeds did not differ significantly between scenarios (p > 0.05, n = 3, which does not prove equivalence). AMP reduced training VRAM by 47.9%; FP16 quantization reduced model size by 49.6% and increased single-image throughput by 29.9% (1.30× speedup) over its FP32 counterpart, with a test confusion matrix identical to that of the autocast-evaluated FP32 model. False negatives decreased from 14 to 8 (42.9%) in the selected models. In three high-confidence true-positive cases, Grad-CAM maps remained qualitatively similar in location across all stages. In this dataset and configuration, staged optimization improved efficiency without measurable loss of accuracy; external validation and tests on physical edge devices are needed before deployment claims.
Co-Authors Majid Rahardi