使用numpy交换数组中一定百分比的元素

import numpy as np

arr = np.array([1, 2, 3, 4, 5])

percentage = 0.2  # 要交换的百分比
num_elements = int(len(arr) * percentage)  # 计算要交换的元素个数

indices = np.random.choice(len(arr), num_elements, replace=False)  # 生成不重复的随机索引

arr[indices[0:num_elements//2]], arr[indices[num_elements//2:]] = arr[indices[num_elements//2:]], arr[indices[0:num_elements//2]]

print(arr)

import numpy as np

arr = np.array([1, 2, 3, 4, 5])
percentage = 0.2
num_elements = int(len(arr) * percentage)
indices = np.random.choice(len(arr), num_elements, replace=False)
arr[indices[0:num_elements//2]], arr[indices[num_elements//2:]] = arr[indices[num_elements//2:]], arr[indices[0:num_elements//2]]
print(arr)