比较两个 numpy 二维数组的相似性
comparing two numpy 2D arrays for similarity
我有 2D numpy array1
,它只包含 0
和 255
值
([[255, 0, 255, 0, 0],
[ 0, 255, 0, 0, 0],
[ 0, 0, 255, 0, 255],
[ 0, 255, 255, 255, 255],
[255, 0, 255, 0, 255]])
和一个 array2
,其大小和形状与 array1
相同,并且也仅包含 0
和 255
值
([[255, 0, 255, 0, 255],
[ 0, 255, 0, 0, 0],
[255, 0, 0, 0, 255],
[ 0, 0, 255, 255, 255],
[255, 0, 255, 0, 0]])
如何比较 array1
和 array2
以确定相似度百分比?
由于您只有两个可能的值,我建议使用此算法进行相似性检查:
import numpy as np
A = np.array([[255, 0, 255, 0, 0],
[ 0, 255, 0, 0, 0],
[ 0, 0, 255, 0, 255],
[ 0, 255, 255, 255, 255],
[255, 0, 255, 0, 255]])
B = np.array([[255, 0, 255, 0, 255],
[ 0, 255, 0, 0, 0],
[255, 0, 0, 0, 255],
[ 0, 0, 255, 255, 255],
[255, 0, 255, 0, 0]])
number_of_equal_elements = np.sum(A==B)
total_elements = np.multiply(*A.shape)
percentage = number_of_equal_elements/total_elements
print('total number of elements: \t\t{}'.format(total_elements))
print('number of identical elements: \t\t{}'.format(number_of_equal_elements))
print('number of different elements: \t\t{}'.format(total_elements-number_of_equal_elements))
print('percentage of identical elements: \t{:.2f}%'.format(percentage*100))
统计相等元素,计算相等元素占元素总数的百分比
我有 2D numpy array1
,它只包含 0
和 255
值
([[255, 0, 255, 0, 0],
[ 0, 255, 0, 0, 0],
[ 0, 0, 255, 0, 255],
[ 0, 255, 255, 255, 255],
[255, 0, 255, 0, 255]])
和一个 array2
,其大小和形状与 array1
相同,并且也仅包含 0
和 255
值
([[255, 0, 255, 0, 255],
[ 0, 255, 0, 0, 0],
[255, 0, 0, 0, 255],
[ 0, 0, 255, 255, 255],
[255, 0, 255, 0, 0]])
如何比较 array1
和 array2
以确定相似度百分比?
由于您只有两个可能的值,我建议使用此算法进行相似性检查:
import numpy as np
A = np.array([[255, 0, 255, 0, 0],
[ 0, 255, 0, 0, 0],
[ 0, 0, 255, 0, 255],
[ 0, 255, 255, 255, 255],
[255, 0, 255, 0, 255]])
B = np.array([[255, 0, 255, 0, 255],
[ 0, 255, 0, 0, 0],
[255, 0, 0, 0, 255],
[ 0, 0, 255, 255, 255],
[255, 0, 255, 0, 0]])
number_of_equal_elements = np.sum(A==B)
total_elements = np.multiply(*A.shape)
percentage = number_of_equal_elements/total_elements
print('total number of elements: \t\t{}'.format(total_elements))
print('number of identical elements: \t\t{}'.format(number_of_equal_elements))
print('number of different elements: \t\t{}'.format(total_elements-number_of_equal_elements))
print('percentage of identical elements: \t{:.2f}%'.format(percentage*100))
统计相等元素,计算相等元素占元素总数的百分比