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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def run(X_train, X_test, y_train, y_test, PARAMS):
    '''Train model and predict result'''
    model.fit(X_train, y_train)
    predict_y = model.predict(X_test)
    score = r2_score(y_test, predict_y)
    LOG.debug('r2 score: %s' % score)
    nni.report_final_result(score)