Python/machine_learning/knn_sklearn.py

from sklearn.datasets import load_iris
from sklearn.model_selection import train_test_split
from sklearn.neighbors import KNeighborsClassifier

# Load iris file
iris = load_iris()
iris.keys()


print(f"Target names: \n {iris.target_names} ")
print(f"\n Features: \n {iris.feature_names}")

# Train set e Test set
X_train, X_test, y_train, y_test = train_test_split(
    iris["data"], iris["target"], random_state=4
)

# KNN

knn = KNeighborsClassifier(n_neighbors=1)
knn.fit(X_train, y_train)

# new array to test
X_new = [[1, 2, 1, 4], [2, 3, 4, 5]]

prediction = knn.predict(X_new)

print(
    "\nNew array: \n {}"
    "\n\nTarget Names Prediction: \n {}".format(X_new, iris["target_names"][prediction])
)