[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fmfngS6rD0W_5NWcvLV3RsuNqZ_a0fwV0y_MgkTJt5WA":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2025-03-02 21:34:37",178206421,[8,9,10,11],"算法","数据","任务需求","以上选项都是",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},3,"fc0c1d00e84a5bdd920ca3eef531981e","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffb47e65ee6bbb8f896e6b4fca1783b07.png","机器学习初步","08996e1921414891aead4a14d408c1e7","2.6 性能度量",""好"模型取决于下列哪些因素",[21,26,35],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],178206422,[30,31,32,33],"错误率","精度","查准率","查全率","收购西瓜的公司希望把瓜摊的好瓜都尽量收走,请问他的评价标准是",{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":24,"type":44},[],178206424,[39,40,41,42],"查准率会上升或不变","查准率会下降或不变","查全率会上升或不变","查全率会下降或不变","假设我们已经建立好了一个二分类模型,输出是 0 或,初始阈值设置为 0.5,超过 0.5 概率估计就判别为 1,否则就判别为 0;如果我们现在用另一个大于 0.5 的阈值, 一般来说下列说法正确的是",1]