KNN algorithm: 'int' object is not subscriptable

Question

i have not been using python for some time and having trouble finding the solution to this problem. I tried to change the equation for euclidean distance function but it did not do any good. Maybe i am blind to see the solution to my problem.

Here is my code:

from math import sqrt
import csv
from random import shuffle
import numpy as np
import numpy
import matplotlib.pyplot as plt
import operator
import math


iris = datasets.load_iris() 

X = iris.data
y = iris.target



def euclideanDistance(id1, id2):
    for x in range(len(id1)-1):
        dist = np.sqrt(np.sum((int(id2[x]) - int(id1[x]))**2))
    return dist

data1 = [2, 2, 2, 'a']
data2 = [4, 4, 4, 'b']
distance = euclideanDistance(data1, data2)
print(distance)

def mykNN(X, y, x_):
    distance = []
    neighbour = []

    for i in range(len(X)):
        d = euclideanDistance(X[i], x_ )
        distance.append((X[i], d))
    distance.sort(key=operator.itemgetter(1))

    for r in range(k):
        options.append(distance[r][0])
    options = neighbour
    return neighbour

k=3

y_ = mykNN(X, y,k)
print(y_)

no matter what how i change my function it comes up with this error.

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-85-2a5bfc4a796d> in <module>
     42 k=3
     43 
---> 44 y_ = mykNN(X, y,k)
     45 print(y_)
     46 

<ipython-input-85-2a5bfc4a796d> in mykNN(X, y, x_)
     31 
     32     for i in range(len(X)):
---> 33         d = euclideanDistance(X[i], x_ )
     34         distance.append((X[i], d))
     35     distance.sort(key=operator.itemgetter(1))

<ipython-input-85-2a5bfc4a796d> in euclideanDistance(id1, id2)
     18 def euclideanDistance(id1, id2):
     19     for x in range(len(id1)-1):
---> 20         dist = np.sqrt(np.sum((int(id2[x]) - int(id1[x]))**2))
     21     return dist
     22 

TypeError: 'int' object is not subscriptable

I would appreciate your response as this has been bothering me.

Thank you.

glibdud · Accepted Answer · 2019-03-06 15:56:07Z

1

Well, the error is telling you that in euclideanDistance(), either id1 or id2 (or both) is an integer, since those are the two identifiers you're indexing on that line. To follow it through:

You set k = 3
You call mykNN(X, y, k), which means that in mykNN(), x_ == 3.
You call euclideanDistance(X[i], x_), which means that in euclideanDistance(), id2 == 3.
You attempt to index id2 on the indicated line. Integers can't be indexed, thus the exception.

So that's what caused your error. As I'm not sure exactly what your code is doing, I can't directly recommend a fix.

answered Mar 6, 2019 at 15:56

glibdud

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