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Curriculum Labeling: Revisiting Pseudo-Labeling for Semi-Supervised Learning

AAAI 2021 · Label-efficient and robust learning › Semi-supervised learning · approach: Confidence-based pseudo-label selection · 285 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Use curriculum self-pacing instead of a fixed threshold (ablation)Pseudo-labeling with heavy augmentation · CIFAR-10test error: 6.21 -> 5.27Helped
Use curriculum self-pacing instead of fixed thresholding (ablation)Pseudo-labeling with moderate augmentation · CIFAR-10test error: 17.11 -> 8.92Helped
Reinitialize model parameters after each self-training round rather than fine-tuning (ablation)Curriculum labeling · CIFAR-10, iteration 5test error: 6.42 -> 5.41Helped
Add Mixup (ablation)Pseudo-labeling without curriculum or augmentation · CIFAR-10top-1 error: 38.47 -> 34.03Helped
Add SWA without Mixup (ablation)Pseudo-labeling without curriculum or augmentation · CIFAR-10top-1 error: 38.47 -> 37.35Helped
Add Mixup and SWA (ablation)Pseudo-labeling without curriculum or augmentation · CIFAR-10top-1 error: 38.47 -> 32.85Helped
Add heavy Random Augmentation, Mixup, and SWA (ablation)Pseudo-labeling without curriculum · CIFAR-10top-1 error: 38.47 -> 8.59Helped
Use curriculum labeling instead of vanilla pseudo-labeling with no curriculum (ablation)Pseudo-labeling · CIFAR-10test error: 8.59 -> 5.27Helped
Use a smaller stepping percentile of 5% rather than the standard 20% step (ablation)Curriculum labeling · CIFAR-10test error: 5.27; 5.45Mixed
Train for more epochs with heavy augmentation and SWA (ablation)Curriculum labeling · CIFAR-10test error: 8.42; 6.46; 7.42Mixed
Omit SWA while using heavy augmentation (ablation)Curriculum labeling · CIFAR-10test error: 5.41 -> 5.76Hurt
Add Mixup to moderate-augmentation pseudo-labeling (ablation)Pseudo-labeling without curriculum · CIFAR-10top-1 error: 22.8 -> 16.11Helped

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