How to use the graphistry.vgraph.create function in graphistry

nodeid = self._node or Plotter._defaultNodeId

        sources = elist[self._source]
        dests = elist[self._destination]
        elist.drop([self._source, self._destination], axis=1, inplace=True)

        # Filter out nodes which have no edges
        lnodes = pandas.concat([sources, dests], ignore_index=True).unique()
        lnodes_df = pandas.DataFrame(lnodes, columns=[nodeid])
        filtered_nlist = pandas.merge(lnodes_df, nlist, on=nodeid, how='left')

        # Create a map from nodeId to a continuous range of integer [0, #nodes-1].
        # The vgraph protobuf format uses the continous integer ranger as internal nodeIds.
        node_map = dict([(v, i) for i, v in enumerate(lnodes.tolist())])

        dataset = vgraph.create(elist, filtered_nlist, sources, dests, nodeid, node_map, name)
        dataset['encodings'] = encodings
        return dataset