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    Initialize a ndarray with values sampled from the uniform distribution on
    [-1, 1]. This initialization model has been chosen to be consistent with
    the ARPACK one as another initialization can lead to convergence issues.

    Parameters
    ----------
    size : int
        The size of the eigenvalue vector to be initialized.

    random_state : int, RandomState instance or None, default=None
        The seed of the pseudo random number generator used to generate a
        uniform distribution. If int, random_state is the seed used by the
        random number generator; If RandomState instance, random_state is the
        random number generator; If None, the random number generator is the
        RandomState instance used by `np.random`.

    Returns
    -------
    v0 : ndarray of shape (size,)
        The initialized vector.
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