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What is the best way to accurately measure the impact of recommendation improvements in an online environment?
①Prioritize only offline RMSE and AUC.
②Assess based solely on user surveys.
③Use a metric that maximizes only the click-through rate in the short term.
④Evaluate multiple metrics, such as click-through rate, retention, and long-term behavior, in A/B tests and online experiments.
⑤Estimate performance by increasing the number of model parameters.