改进LFR生成符号网络

对每个节点连到外面的边，强制将按一定比例将其改成负值。

这还有个例子，比如0.6的外联比例，0.25的负外联比例。就可以制造每个节点的内联概率为40%，外联但是正边的概率35%，外联负边概率25%

FR的生成代码里加一个概率参数，随机改变每个点的一些外联边为负就可以啦

LFR 原始论文 PDF 地址：

Benchmark graphs for testing community detection algorithms

https://sites.google.com/site/santofortunato/benchmark.pdf?attredirects=0

Benchmarks for testing community detection algorithms on directed and weighted

graphs with overlapping communities

https://sites.google.com/site/santofortunato/newbenchmarks.pdf?attredirects=0

源程序在 Santo Fortunat 的网站上可以找到：

https://sites.google.com/site/santofortunato/inthepress2
参考文献：https://www.nature.com/articles/srep14339/
LFR简单入门：https://blog.youkuaiyun.com/u011089523/article/details/76589065