We will be performing k-fold cross-validation with 3 folds (cv=3) on the RandomForestClassifier model, and calculating the mean accuracy, precision, recall and F1 score values for the same.
Please follow the below steps:
Please create an instance of RandomForestClassifier called rnd_clf by passing to it the parameters - n_estimators=20, max_depth=10 and random_state=42
rnd_clf = RandomForestClassifier(<<your code comes here>>)
Please call cross_val_score() function by passing following parameters to it - the model (rnd_clf), the training dataset (X_train), y_train, cv=3 and scoring="accuracy" - and save the returned value in a variable called rnd_cv_scores.
Call display_scores() function, by passing to it the rnd_cv_scores variable, to calculate and display(print) the 'accuracy' score, the mean of the 'accuracy' score and the 'standard deviation' of the 'accuracy' score.
rnd_cv_scores = cross_val_score(<<your code comes here>>)
display_scores(rnd_cv_scores)
Call mean() method on rnd_cv_scores object to get the mean accuracy score and store this mean accuracy score in a variable rnd_cv_accuracy.
rnd_cv_accuracy = rnd_cv_scores.<<your code comes here>>
Please call cross_val_predict() function by passing following parameters to it - the model (rnd_clf), the training dataset (X_train), y_train, cv=3 - and save the returned value in a variable called y_train_pred.
y_train_pred = cross_val_predict(<<your code comes here>>)
Compute the confusion matrix by using confusion_matrix() function
confusion_matrix(y_train, <<your code comes here>>)
Calculate the precision score by the using the precision_score() function
rnd_cv_precision = precision_score(y_train, <<your code comes here>>, average='weighted')
Calculate the recall score by the using the recall_score() function
rnd_cv_recall = recall_score(y_train, <<your code comes here>>, average='weighted')
Calculate the F1 score by the using the f1_score() function
rnd_cv_f1_score = f1_score(y_train, <<your code comes here>>, average='weighted')
Print the above calculated values of rnd_cv_accuracy, rnd_cv_precision, rnd_cv_recall , rnd_cv_f1_score
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