Budget control 1 Data driven decision 1 Data-driven decision-making 1 Decision making 1 Decisions makings 1 Economic and social effects Learning algorithms 1 Non-stationarities 1 Non-stationary bandit optimization 1 Nonstationary 1 Operations research 1 Optimisations 1 Parameter estimation 1 Parameter-free algorithm 1 Regret bounds 1 SARS 1 Stochastic systems 1 Stochastics 1 data-driven decision-making 1 non-stationary bandit optimization 1 parameter-free algorithms 1