hand for creating marginchart. Similar to ``add_custom_scalars()``, but the only necessary argument
        is *tags*, which should have exactly 3 elements.

        Args:
            tags (list): list of tags that have been used in ``add_scalar()``

        Examples::

            writer.add_custom_scalars_marginchart(['twse/0050', 'twse/2330', 'twse/2006'])
        z2tensorboard.logging.add_custom_scalars_marginchart