def METHOD_NAME(xarr):
    """
    Calculates the sum of decomposed polynomial components
    at given x values.
    Parameters
    -----------
    xarr: :class:`numpy.ndarray`
        X values at which to evaluate the function.
    """
    func_components = np.array([lambda_poly(xarr, pset) for pset in params])
    return np.dot(lambdas, func_components)