这段中的while后面一部分是什么意思，有大神教教吗

from PIL import Image
import numpy as np
def rebuild_img(u, sigma, v, p):#p表示奇异值的百分比
print (p)
m = len(u)
n = len(v)
a = np.zeros((m, n))#m行n列的矩阵
count = (int)(sum(sigma))
curSum = 0
k = 0
while curSum <= count * p:
uk = u[:, k].reshape(m, 1)
vk = v[k].reshape(1, n)
a += sigma[k] * np.dot(uk, vk)
curSum += sigma[k]
k += 1
print ('k:',k)
a[a < 0] = 0
a[a > 255] = 255
#按照最近距离取整数，并设置参数类型为uint8
return np.rint(a).astype("uint8")
if __name__ == '__main__':
img = Image.open('1.jpg', 'r')
a = np.array(img)
for p in np.arange(0.1, 1, 0.1):
u, sigma, v = np.linalg.svd(a[:, :, 0])
R = rebuild_img(u, sigma, v, p)
u, sigma, v = np.linalg.svd(a[:, :, 1])
G = rebuild_img(u, sigma, v, p)
u, sigma, v = np.linalg.svd(a[:, :, 2])
B = rebuild_img(u, sigma, v, p)
I = np.stack((R, G, B), 2)
#保存图片在img文件夹下
Image.fromarray(I).save(str(p * 100) + ".jpg")