numpy 随机采样 sample() 用法及代码示例

numpy.random.sample() 是用于在numpy中进行随机采样的功能之一。它返回指定形状的数组,并在半开间隔中将其填充为随机浮点数[0.0, 1.0).

用法:

numpy.random.sample(size=None)

参数:
size :[int或int元组,可选]输出形状。如果给定的形状是例如(m,n,k),则绘制m * n * k个样本。默认值为无,在这种情况下,将返回单个值。

**Return :**间隔中的随机浮动数组[0.0, 1.0).如果未提供尺寸,则为单个此类随机浮动。

代码1:

# Python program explaining 
# numpy.random.sample() function 
  
# importing numpy 
import numpy as geek 
  
# output random value 
out_val = geek.random.sample() 
print ("Output random value:", out_val)

输出:

Output random value: 0.9261509680895836

代码2:

# Python program explaining 
# numpy.random.sample() function 
  
# importing numpy 
import numpy as geek 
  
  
# output array 
out_arr = geek.random.sample(size =(3, 3)) 
print ("Output 2D Array filled with random floats:", out_arr)

输出:

Output 2D Array filled with random floats: [[ 0.75908777  0.88295677  0.60979136]
 [ 0.68157065  0.75100312  0.08321613]
 [ 0.8360331   0.64808891  0.14731635]]

代码3:

# Python program explaining 
# numpy.random.sample() function 
  
# importing numpy 
import numpy as geek 
  
# output array 
out_arr = geek.random.sample((2, 2, 3)) 
print ("Output 3D Array filled with random floats:", out_arr)

输出:

Output 3D Array filled with random floats: [[[ 0.3073475   0.75709465  0.86934712]
  [ 0.21953745  0.48138292  0.30686482]]

 [[ 0.48925625  0.60222083  0.14403257]
  [ 0.87030919  0.87298872  0.2222136 ]]]

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