【判断题】特征选择和特征提取的目的是为了降低特征空间的维度。
【单选题】“枯杨生稊” 一 语 中 “ 稊 ” 的 意思是
【单选题】特征提取的目的是()
A.
降低空间维数,使后续分类器设计在计算上更容易实现
B.
消除特征之间可能存在的相关性,使新特征更有利于分类
【单选题】The tone of this passage is mainly.
【多选题】根据流体流动的空间特点,通常可将油气藏分为 和 两大类
【单选题】As is often the _______, the h ousewife gives the house a thorough cleaning ________. [ ]
A.
matter; every two days
B.
situation; each second day
D.
case; every second day
【单选题】根据流体流动的空间特点,通常可将油气藏分为 层状油气藏 和 两大类。
【判断题】特征提取是通过映射得到一组新的特征,特征选择是从高维特征中选出一组最有效的特征以达到降低特征空间维数的目的。
【单选题】It has been hypothesized that much of the matter in the universe is 'dark,' i. e. , unseen. Studies have shown that galaxies in many galaxy clusters are moving faster with respect to one another than ...
A.
Measurements of the speed of moving galaxies are extremely unreliable.
B.
The workings of gravitational forces are not particularly well understood.
C.
The aggregate mass of visible stars in the galaxies mentioned above can be estimated with some confidence.
D.
The general composition of unseen matter in the universe has been determined.
E.
Without exception, the galaxies mentioned above move toward one another.