TypeError: 'int' object is not callable in Python (3.7)

I am trying to write the following formula in Python (3.7):

CBA formula

But unfortunately I am getting a TypeError: ‘int’ object is not callable . Below is the code I am trying to run:

import numpy as np

##CBA
cm=np.array([[20,0,0],[1,14,0],[0,0,13]])
print(cm)

for i in range(3):
    a = cm[i,i]
    sum1 = cm[i,0]+cm[i,1]+cm[i,2]
    sum2 = cm[0,i] + cm[1,i] + cm[2,i]
    eq = ((a / max(sum1,sum2))/3)
    add = sum(eq)
    print(add)

Here is the error:

 """
import numpy as np

##CBA
cm=np.array([[20,0,0],[1,14,0],[0,0,13]])
print(cm)

for i in range(3):
    a = cm[i,i]
    sum1 = cm[i,0]+cm[i,1]+cm[i,2]
    sum2 = cm[0,i] + cm[1,i] + cm[2,i]
    eq = ((a / max(sum1,sum2))/3)
    add = sum(eq)
    print(add)
[[20  0  0]
 [ 1 14  0]
 [ 0  0 13]]

Traceback (most recent call last):

  File "<ipython-input-1-72bf927660e0>", line 17, in <module>
    add = sum(eq)

TypeError: 'numpy.float64' object is not iterable

How can I sum the eq variable?

>Solution :

If eq is just a single variable (and not an array), then you don’t use the sum function at all. You would need:

##CBA
cm=confusion_matrix(y_test,y_pred)

sumx = 0
for i in range(3):
    a = cm[i,i]
    sum1 = cm[i,0] + cm[i,1] + cm[i,2]
    sum2 = cm[0,i] + cm[1,i] + cm[2,i]
    sumx += ((a / max(sum1,sum2))/3)
print(sumx)
print(sumx/3)

However, there are many potential improvements to this. If cm is a numpy array, then you can sum up a column or a row at a time:

for i in range(3):
    a = cm[i,i]
    sum1 = np.sum(cm[i,:])
    sum2 = np.sum(cm[:,i])
    sumx += ((a / max(sum1,sum2))/3)