Linear regression in smartcore

linear_regression.rs

// train split 
let (x_train, x_test, y_train, y_test) = train_test_split(&xmatrix.unwrap(), &y, 0.3, true);

// model 
let linear_regression = LinearRegression::fit(&x_train, &y_train, Default::default()).unwrap();
// predictions 
let preds = linear_regression.predict(&x_test).unwrap(); 
// metrics 
let mse = mean_squared_error(&y_test, &preds);
println!("MSE: {:?}", mse);