Confusion matrix python

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)

Source: grepper.com

Confusion matrix python

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)

Source: scikit-learn.org

Confusion matrix python

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

Source: stackoverflow.com

Confusion matrix python

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

Source: localhost

Similar codes

1 vote102 views2 answers
Flask print to console
Python
0 vote102 views1 answer
Protobuf python
Python
4 votes103 views1 answer
Knn sklearn
Python
0 vote105 views1 answer
Python cursor placement
Python
12 votes116 views2 answers
Vscode not recognizing python import
Python
25 votes99 views10 answers
Github
Python
12 votes98 views1 answer
Python copy ddictionary
Python
12 votes98 views2 answers
Filtering a list
Python
0 vote127 views1 answer
Mechanize python XE #25
Python
21 votes106 views1 answer
Python remove last characters from string
Python