如下表所示，X={butter,cheese}，Y={beer}，则置信度confidence(X→Y)=（ ）。交易号（TID）商品（Items）1beer, diaper, nuts2beer, biscuit, diaper3bread, butter, cheese4beer, cheese, diaper, nuts5beer, butter, cheese, nuts? 2/5|1/3|1/4|1/2
举一反三
- 中国大学MOOC: 如下表所示，使用FP-Growth计算其频繁集，给定最小支持度为40%，频繁模式树（FP树）有（ ）个结点。（不包括根结点）。交易号（TID）商品（Items）1beer, diaper, nuts2beer, biscuit, diaper3bread, butter, cheese4beer, cheese, diaper, nuts5beer, butter, cheese, nuts
- Milk，butter，and cheese are（）here from the farms.
- Milk, butter and cheese are _______ here from the farms.
- 若x=[1 2 3 4 5];y=[2 -1 4 3 -2];则z=x.*y=()
- 执行以下语句的结果：dict1={"x":1,"y":2,"z":3}dict2={"x":4,"a":5}dict1.update(dict2) A: {"x":1,"y":2,"z":3,"x":4,"a":5} B: {"x":4,"a":5,"x":1,"y":2,"z":3} C: 有重复项，结果有误！ D: {"x":4,"y":2,"z":3,"a":5}