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질문 주신 내용이 있는지 문서를 찾아봤는데 제가 못 찾은 것일 수도 있겠지만 아래 문서를 봐서는 해당 기능을 찾을 수 없습니다.

아래 해당 기능에 대한 문서입니다.

Docstring:     
Provides Beautiful Animated Marker Clustering functionality for maps.

Parameters
----------
locations: list of list or array of shape (n, 2).
    Data points of the form [[lat, lng]].
popups: list of length n, default None
    Popup for each marker, either a Popup object or a string or None.
icons: list of length n, default None
    Icon for each marker, either an Icon object or a string or None.
name : string, default None
    The name of the Layer, as it will appear in LayerControls
overlay : bool, default True
    Adds the layer as an optional overlay (True) or the base layer (False).
control : bool, default True
    Whether the Layer will be included in LayerControls.
show: bool, default True
    Whether the layer will be shown on opening (only for overlays).
icon_create_function : string, default None
    Override the default behaviour, making possible to customize
    markers colors and sizes.
options : dict, default None
    A dictionary with options for Leaflet.markercluster. See
    https://github.com/Leaflet/Leaflet.markercluster for options.

Example
-------
>>> icon_create_function = '''
...     function(cluster) {
...     return L.divIcon({html: '<b>' + cluster.getChildCount() + '</b>',
...                       className: 'marker-cluster marker-cluster-small',
...                       iconSize: new L.Point(20, 20)});
...     }
... '''
File:           ~/opt/anaconda3/lib/python3.7/site-packages/folium/plugins/marker_cluster.py