vis.js如何在具有最短连接线长度的布局中显示网络？

<script src="vis.js"></script>
<link href="vis-network.min.css" rel="stylesheet" type="text/css" />

var nodes = new vis.DataSet([
  { id: 1, label: 'Node 1' },
  { id: 2, label: 'Node 2' },
  { id: 3, label: 'Node 3' }
]);

var edges = new vis.DataSet([
  { from: 1, to: 2 },
  { from: 2, to: 3 },
  { from: 3, to: 1 }
]);

var data = {
  nodes: nodes,
  edges: edges
};

var options = {
  layout: {
    improvedLayout: true
  }
};

var container = document.getElementById('network');
var network = new vis.Network(container, data, options);