regressor_lasso = Lasso(alpha=1, max_iter=10e5)
regressor_lasso.fit(X_train,y_train)

y_pred = regressor_lasso.predict(X_test)

train_score=regressor_lasso.score(X_train,y_train)
test_score=regressor_lasso.score(X_test,y_test)
coeff_used = np.sum(regressor_lasso.coef_!=0)