[Proposal]Performance optimization in clustering coefficient

[PaulWongDlut]

@yecol

I got a very bad performance when I use the clustering coefficient api over a very large dataset.

Then I realized that there are lots of nodes in the graph with only 1 neighbor which theoretically means that their clustering coefficient is zero.

So I think if there is any possibility to reduce the computation cost over the nodes with degree of 1, in order to improve the clustering coefficient performance.

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[yecol]

Thanks for your proposal!
We will consider this solution and try to improve its performance!
Could you also provide the datasets to reproduce this?