public GraphvizFormatter(ConnectionCosts costs) {this.costs = costs;this.bestPathMap = new HashMap<>();sb.append(formatHeader());sb.append("  init [style=invis]\n");sb.append("  init -> 0.0 [label=\"" + BOS_LABEL + "\"]\n");}

public GraphvizFormatter(ConnectionCosts costs){this.costs = costs;this.bestPathMap = new Dictionary<string, string>();sb.Append(FormatHeader());sb.Append("  init [style=invis]\n");sb.Append("  init -> 0.0 [label=\"" + BOS_LABEL + "\"]\n");}
