/Python/Compute confusion matrix using python

Compute confusion matrix using python

import numpy as np

currentDataClass = [1, 3, 3, 2, 5, 5, 3, 2, 1, 4, 3, 2, 1, 1, 2]
predictedClass = [1, 2, 3, 4, 2, 3, 3, 2, 1, 2, 3, 1, 5, 1, 1]

def comp_confmat(actual, predicted):

    classes = np.unique(actual) # extract the different classes
    matrix = np.zeros((len(classes), len(classes))) # initialize the confusion matrix with zeros

    for i in range(len(classes)):
        for j in range(len(classes)):

            matrix[i, j] = np.sum((actual == classes[i]) & (predicted == classes[j]))

    return matrix

comp_confmat(currentDataClass, predictedClass)

array([[3., 0., 0., 0., 1.],
       [2., 1., 0., 1., 0.],
       [0., 1., 3., 0., 0.],
       [0., 1., 0., 0., 0.],
       [0., 1., 1., 0., 0.]])

Source: stackoverflow.com

Similar codes

75 votes243 views2 answers
Python write to file while reading
Python
0 vote244 views1 answer
Python manually trigger exception
Python
0 vote272 views1 answer
Argumrnt with reverse django
Python
1 vote249 views1 answer
Python file.write is not writing whole line
Python
0 vote265 views1 answer
How to add a list to dataframe in python
Python
2 votes294 views1 answer
How to redirect in flask to the same page
Python Flask
27 votes279 views4 answers
Random letter generator python
Python
7 votes225 views3 answers
How to add multiple commands to tkinter button
Python
0 vote276 views2 answers
Split a list based on a condition
Python
0 vote243 views1 answer
Get current url with parameters url django
Python