Best_Tuning_Parameters.txt

Accuracy of SGDClassifier (support vector machine - SVM) - 91.27829560585884

Accuracy (after tuning) of SGDClassifier (support vector machine - SVM) - 93.40878828229027

Grid Search best score -
0.974302171023

Grid Search best parameters -
{'clf__alpha': 0.0001,
 'tfidf__smooth_idf': False,
 'tfidf__sublinear_tf': True,
 'tfidf__use_idf': True,
 'vect__ngram_range': (1, 1)}
 
Metrics classification report 
                        precision    recall  f1-score   support

           alt.atheism       0.95      0.81      0.87       319
         comp.graphics       0.88      0.97      0.92       389
               sci.med       0.94      0.90      0.92       396
soc.religion.christian       0.90      0.95      0.93       398

           avg / total       0.92      0.91      0.91      1502


Metric Confusion matrix
[[258  11  15  35]
 [  4 379   3   3]
 [  5  33 355   3]
 [  5  10   4 379]]