以下哪些是评价推荐系统准确率的方法？（多选题） Which of the following are ways to evaluate the accuracy of a recommender system?  Select all that apply多项选择题

A

平均绝对误差 MAE

B

归一化均方误差 NRMSE

C

归一化平均绝对误差 NMAE

D

均方误差 RMSE

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Question 31

医疗人工智能模型用于检测500名患者的疾病： 实际上有100名患者患有这种疾病 模型正确识别了其中70种 它错误地将50名健康患者诊断为患病 问题： 计算模型的精度。 计算型号的召回率。

Which metric answers the question: “Of the items the model said were positive, how many actually were positive?”

Sometimes we have to tune a model to bias more towards a certain type of error or performance metric (e.g., false positives, false negatives, precision, recall) because of the nature of a specific use case (e.g., cancer detection/prediction vs spam detection).

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