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All Journal Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi)
Jenny Erlita
Universitas Royal
Computer Science & IT Engineering

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Heterogeneous Stacking Ensemble with SMOTE-Based Oversampling for Agricultural Commodity Price Prediction under Extreme Class Imbalance Yessica Siagian; Neni Mulyani; Jeperson Hutahaean; Dinda Maharani; Jenny Erlita
Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Vol 10 No 5 (2026): October 2026 (In progress)
Publisher : Ikatan Ahli Informatika Indonesia (IAII)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29207/resti.v10i5.8065

Abstract

Predicting agricultural commodity prices is vital for food security and market stability, but price data is highly non-linear, high-cardinality, and severely imbalanced, rendering conventional accuracy metrics misleading. This study proposes a heterogeneous stacking ensemble of LightGBM, XGBoost, and Random Forest base learners with a LightGBM meta-learner, evaluated against five BorderlineSMOTE oversampling variants and four ensemble configurations under a 282:1 class imbalance. A controlled ablation across six configurations — including a new factorial design that isolates the contributions of oversampling and an MLP base learner — demonstrates that performance is driven by the stacking architecture rather than by synthetic oversampling or deep learning components. The ensemble without oversampling achieves MCC = 0.9509 and AUC-OvR = 0.9908 on the held-out test set, while the addition of an MLP base learner yields no consistent improvement (|ΔMCC| < 0.008 across both SMOTE and no-SMOTE conditions). These findings identify cost-sensitive heterogeneous stacking as an effective and computationally tractable strategy for highly imbalanced tabular agricultural data, and establish that synthetic oversampling and MLP-based components are unnecessary under these conditions.
Co-Authors Dinda Maharani Jeperson Hutahaean Neni Mulyani Yessica Siagian