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python-scikit-learnHow to get model accuracy score


from sklearn import datasets, neighbors, model_selection, metrics

X, y = datasets.load_iris(return_X_y=True)
X_train, X_test, y_train, y_test = model_selection.train_test_split(X, y)

model = neighbors.KNeighborsClassifier(3)
model.fit(X_train, y_train)
y_pred = model.predict(X_test)

accuracy = metrics.accuracy_score(y_pred, y_test)ctrl + c
from sklearn import

import module from scikit-learn

load_iris

loads Iris dataset

model_selection.train_test_split

splits given X and y datasets to test (25% of values by default) and train (75% of values by default) subsets

.KNeighborsClassifier(

K neighbors classification model

.fit(

train model with a given features and target variable dataset

.predict(

predict target variable based on given features dataset

.accuracy_score(

accuracy classification score


Usage example

from sklearn import datasets, neighbors, model_selection, metrics

X, y = datasets.load_iris(return_X_y=True)
X_train, X_test, y_train, y_test = model_selection.train_test_split(X, y)

model = neighbors.KNeighborsClassifier(3)
model.fit(X_train, y_train)
y_pred = model.predict(X_test)

accuracy = metrics.accuracy_score(y_pred, y_test)
print(accuracy)
output
0.9473684210526315