def _get_hover_data(self, data, element, empty=False):
        if 'hover' in self.default_tools + self.tools:
            for d in element.dimensions(label=True):
                sanitized = util.dimension_sanitizer(d)
                data[sanitized] = [] if empty else element.dimension_values(d)
Initializes hover data based on Element dimension values.
dataset/ETHPy150Open ioam/holoviews/holoviews/plotting/bokeh/element.py/ElementPlot._get_hover_data