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a  Monthly Sunspot Numbers, 1749 - 1983

    Monthly mean relative sunspot numbers from 1749 to 1983. Collected at Swiss
    Federal Observatory, Zurich until 1960, then Tokyo Astronomical
    Observatory.

    Parameters
    ----------
    as_series : bool, optional (default=False)
        Whether to return a Pandas series. If True, the index will be set to
        the observed years/months. If False, will return a 1d numpy array.

    dtype : type, optional (default=np.float64)
        The type to return for the array. Default is np.float64, which is used
        throughout the package as the default type.

    Notes
    -----
    This is monthly data, so *m* should be set to 12 when using in a seasonal
    context.

    Examples
    --------
    >>> from pmdarima.datasets import load_sunspots
    >>> load_sunspots()
    array([58. , 62.6, 70. , ..., 55.8, 33.3, 33.4])

    >>> load_sunspots(True).head()
    Jan 1749    58.0
    Feb 1749    62.6
    Mar 1749    70.0
    Apr 1749    55.7
    May 1749    85.0
    dtype: float64

    References
    ----------
    .. [1] https://www.rdocumentation.org/packages/datasets/versions/3.6.1/topics/sunspots

    Returns
    -------
    rslt : array-like, shape=(n_samples,)
        The sunspots dataset. There are 2820 observations.
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