Question

我正在尝试编写一个k均值算法，并且现在处于非常基本的阶段代码如下随机选择聚类中心：

import numpy as np

import random

X = [2,3,5,8,12,15,18]

C = 2

def rand_center(ip,C):

    centers = {}
    for i in range (C):
        if i>0:
            while centers[i] != centers[i-1]:   
                centers[i] = random.choice(X)
                else:
            centers[i] = random.choice(X)   
    return centers
    print (centers)

rand_center(X,C)

当我运行它时，它给了我KeyError：1
任何人都可以指导我解决此错误？

Answer 1

while centers[i] != centers[i-1] ... for i in range (C):循环的第二次迭代会发生什么？

centers[1] != centers[0] ...此时没有centers[1]。

Answer 2

我想这个问题是因为数组的索引不正确。因此，如果您重新检查数组中传递的索引可能会帮助您解决此问题。如果您发布了导致此错误的行号，则对我调试代码会更有帮助。

Answer 3

你的代码错了你应该按如下方式重写

find . -type f -name '*_top_hits.txt' -print -exec cat {} \; > combinedresults.txt

Answer 4

我希望你期待输出：即。字典与键和价值在Current，Previous和Next键中没有相同的值。

import numpy as np
import random

X = [2,3,5,8,12,15,18]
C = 2

def rand_center(ip,C):
    centers = {}
    for i in range (C):
        rand_num = random.choice(X) 
        if i>0:
            #Add Key and Value in Dictionary. 
            centers[i] = rand_num
            #Check condition if it Doesn't follow the rule, then change value and retry.
            while rand_num != centers[i-1]: 
                centers[i] = rand_num
                #Change the current value 
                rand_num = random.choice(X) 
        else:
            #First Key 0 not having previous element. Set it as default  
            centers[i] = rand_num   
    return centers

print"Output: ",rand_center(X,C)

Keyerror：1个蟒蛇

4 个答案: