This example demonstrates a force-directed network graph with multi-mark nodes, where each node is represented by both a circle and a text label. It shows how to construct and update a visualization using D3 version 3.5.5, loading edge data from a CSV file and filtering links by weight. The code uses `d3.layout.force` for simulation, appending SVG lines for edges and grouped `<g>` elements containing circle and text marks for nodes, with positions updated on each tick event.