Update

        edge_attr=edge_features,

        pos=node_pos_features)

  def to_dgl_graph(self, self_loop=False):

  def to_dgl_graph(self, self_loop=True):

    """Convert to DGL graph data instance

    Returns

      Graph data for DGL

    self_loop: bool

      Whether to add self loops for the nodes, i.e. edges from nodes

      to themselves. Default to False.

      to themselves. Default to True.

    Notes

    -----