Which of the following is not a guideline for a frequency distribution（）
Avoid open-ended classes
B. Use the 2k rule to determine the number of classes
C. Make the lower limit of the first class a multiple of the class interval
D. Each class should have more than 5 observations
查看答案
What is true about the range（）
A. Only two values are used in its calculation
B. It is in different units than the mean
C. It can be used for nominal data
D. All values are used in its calculation
The main purpose of descriptive statistics is to（）
A. summarize data in a useful and informative manner
B. estimate a population characteristic based on a sample
C. determine if the data adequately represents the population
D. gather or collect data
According to Laozi, the effective approach one should adopt for the knowledge of the Dao is through______（）
A. the correct use of names
B. the precise description of language
C. concepts and logical reasoning
D. the intuitive understanding of mind
关于深度学习的说法中，下面说法正确的是（）
A. 用Sigmoid激活函数时，如果权重初始化较大或较小时，容易出现梯度饱和梯度消失，可选用Tanh函数改进
B. 批规范化（batch normalization）是在不引入新参数的情况下保证每一层网络的输入具有相同的分布
C. 与Sigmoid函数相比，Relu较不容易使网络产生梯度消失
D. 梯度下降法实现简单，当目标函数是凸函数时，可基于二阶收敛快速到达目标值
微信支付 
支付宝支付