How to use the geoviews.operation.projection.project_path function in geoviews

def _process_element(self, element):
        if not len(element):
            return element.clone(crs=self.p.projection)
        geom = element.geom()
        vertices = geom_to_array(geom)
        if isinstance(geom, (MultiPolygon, Polygon)):
            obj = Polygons([vertices])
        else:
            obj = Path([vertices])
        geom = project_path(obj, projection=self.p.projection).geom()
        return element.clone(geom, crs=self.p.projection)

def _process_element(self, element):
        if not len(element):
            return element.clone(crs=self.p.projection)
        geom = element.geom()
        vertices = geom_to_array(geom)
        if isinstance(geom, (MultiPolygon, Polygon)):
            obj = Polygons([vertices])
        else:
            obj = Path([vertices])
        geom = project_path(obj, projection=self.p.projection).geom()
        return element.clone(geom, crs=self.p.projection)

def _process_element(self, element):
        nodes = project_points(element.nodes, projection=self.projection)
        data = (element.data, nodes)
        if element._edgepaths:
            data = data + (project_path(element.edgepaths, projection=self.projection),)
        return element.clone(data, crs=self.projection)

else:
                data = data + (resampled,)
        return element.clone(data, crs=proj, bounds=None, datatype=datatypes)


class project(Operation):
    """
    Projects GeoViews Element types to the specified projection.
    """

    projection = param.ClassSelector(default=ccrs.GOOGLE_MERCATOR,
                                     class_=ccrs.Projection,
                                     instantiate=False, doc="""
        Projection the image type is projected to.""")

    _operations = [project_path, project_image, project_shape,
                   project_graph, project_quadmesh, project_points]

    def _process(self, element, key=None):
        for op in self._operations:
            element = element.map(op.instance(projection=self.p.projection),
                                  op.supported_types)
        return element

else:
                data = data + (resampled,)
        return element.clone(data, crs=proj, bounds=None, datatype=datatypes)


class project(Operation):
    """
    Projects GeoViews Element types to the specified projection.
    """

    projection = param.ClassSelector(default=ccrs.GOOGLE_MERCATOR,
                                     class_=ccrs.Projection,
                                     instantiate=False, doc="""
        Projection the image type is projected to.""")

    _operations = [project_path, project_image, project_shape,
                   project_graph, project_quadmesh, project_points]

    def _process(self, element, key=None):
        for op in self._operations:
            element = element.map(op.instance(projection=self.p.projection),
                                  op.supported_types)
        return element

def _process_element(self, element):
        proj = self.p.projection
        nodes = project_points(element.nodes, projection=proj)
        data = (element.data, nodes)
        if element._edgepaths:
            data = data + (project_path(element.edgepaths, projection=proj),)
        return element.clone(data, crs=proj)