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compute confusion matrix using python

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Frail Fowl answered on April 24, 2020 Popularity 10/10 Helpfulness 1/10

answer compute confusion matrix using python

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compute confusion matrix using python

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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.]])

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Source: stackoverflow.com

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Contributed on Dec 20 2020

Frail Fowl

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confusion matrix python

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from sklearn.metrics import confusion_matrix
conf_mat = confusion_matrix(y_test, y_pred)
sns.heatmap(conf_mat, square=True, annot=True, cmap='Blues', fmt='d', cbar=False)

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Contributed on Nov 23 2021

Adventurous Addax

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confusion matrix python

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By definition, entry i,j in a confusion matrix is the number of 
observations actually in group i, but predicted to be in group j. 
Scikit-Learn provides a confusion_matrix function:

from sklearn.metrics import confusion_matrix
y_actu = [2, 0, 2, 2, 0, 1, 1, 2, 2, 0, 1, 2]
y_pred = [0, 0, 2, 1, 0, 2, 1, 0, 2, 0, 2, 2]
confusion_matrix(y_actu, y_pred)
# Output
# array([[3, 0, 0],
#        [0, 1, 2],
#        [2, 1, 3]], dtype=int64)

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Source: scikit-learn.org

Tags: confusion-matrix conf

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Contributed on Apr 24 2020

Bored Coder

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confusion matrix python code

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from sklearn.metrics import confusion_matrix
cm = confusion_matrix(y_test, y_predicted)
cm
# after creating the confusion matrix, for better understaning plot the cm.
import seaborn as sn
plt.figure(figsize = (10,7))
sn.heatmap(cm, annot=True)
plt.xlabel('Predicted')
plt.ylabel('Truth')

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Contributed on Apr 08 2021

Clumsy Cowfish

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confusion matrix python

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from sklearn.metrics import accuracy_score
from sklearn.metrics import classification_report, confusion_matrix

print(confusion_matrix(y_test, y_pred_test.round()))
print(classification_report(y_test, y_pred_test.round()))

# Output:
[[99450   250]
 [ 4165 11192]]
              precision    recall  f1-score   support

           0       0.96      1.00      0.98     99700
           1       0.98      0.73      0.84     15357

    accuracy                           0.96    115057
   macro avg       0.97      0.86      0.91    115057
weighted avg       0.96      0.96      0.96    115057

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Source: localhost

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Contributed on Apr 19 2022

Ruben Visser

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how to get confusion matrix in python

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from sklearn.metrics import confusion_matrix
conf_mat = confusion_matrix(y_test, y_pred)

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Contributed on Dec 23 2021

Colorful Copperhead

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Create confusion matrix manually using python

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import matplotlib.pyplot as plt
import numpy
from sklearn import metrics

confusion_matrix = numpy.array([[  6,  94, 10],[ 80, 821 , 100], [ 80, 821 , 10]])

cm_display = metrics.ConfusionMatrixDisplay(confusion_matrix = confusion_matrix, display_labels = ['Sat', 'Sun', 'Mon'])

cm_display.plot()
plt.show()

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Contributed on Oct 05 2022

Alhassan Federated

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confusion matrix python

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df_confusion = pd.crosstab(y_actu, y_pred, rownames=['Actual'], colnames=['Predicted'], margins=True)

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Source: stackoverflow.com

Tags: confusion-matrix conf

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Contributed on Jan 18 2021

Bad Bison

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confusion matrix python

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CONFUSION MATRIX

Popularity 1/10 Helpfulness 1/10 Language python

Source: Grepper

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Contributed on Sep 03 2022

Stupid Skylark

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compute confusion matrix using python

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