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Adversarial Attacks on Adversarial Bandits

ICLR 2023 · Bandits and online learning › Multi-armed bandits · approach: Non-stationary and structured-reward bandits · 3 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Apply the easy template-based attack targeting a1Exp3 · Easy attack example, T=10^6target arm selections: 1.45× 10^4 -> 9.85× 10^5Helped
Apply the easy template-based attackExpRb with Φ=T^0.5 · Easy attack example, T=10^6target arm selections: 9.83× 10^6Helped
Use the general attack instead of the easy attackExp3 · Easy attack example, T=10^6target arm selections: 9.85× 10^5 -> 9.85× 10^5No clear effect
Increase ε from 0.25 to 0.4 (ablation)Exp3 general attack · General attack exampletarget arm selectionsHelped
Set ε=0.25 (ablation)Exp3 general attack · General attack examplecumulative attack cost: 4.20× 10^2, 2.84× 10^3, 1.85× 10^4, and 1.14× 10^5Helped
Increase ExpRb's assumed attack budget Φ (ablation)ExpRb under the easy attack · Easy attack example, T=10^6target arm selections: 98.3%, 89.7%, and 63.2%Hurt
Increase ExpRb's assumed attack budget Φ (ablation)ExpRb under the general attack · General attack example, T=10^6cumulative attack cost: 1.40×10^5, 3.62× 10^5, and 5.15× 10^5Hurt
Use the general attack with ε=0.25Exp3 · General attack example, T=10^6target arm selections: 9.24× 10^5Helped

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