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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 _get_envelopes_centroid(envelopes):
 """ Returns the centroid of an inputted geometry column. Not currently in use, as this is now handled by this library's CRS wrapper directly. Light wrapper over ``_get_envelopes_min_maxes``. Parameters envelopes : GeoSeries The envelopes of the given geometries, as would be returned by e.g. ``data.geometry.envelope``. Returns ------- (mean_x, mean_y) : tuple The data centroid. """

    xmin, xmax, ymin, ymax = _get_envelopes_min_maxes(envelopes)
    return np.mean(xmin, xmax), np.mean(ymin, ymax)