共享数据集

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提供一个非常好的数据集链接的拉链:
http://www.stanford.edu/class/cs224w/resources.html ---->
http://snap.stanford.edu/data/ ---->
http://www.cise.ufl.edu/research/sparse/matrices/SNAP/ ---->
http://www.cise.ufl.edu/research/sparse/matrices/
http://www.cise.ufl.edu/research/sparse/

这应该包含了比较全的数据集了，跨度也比较大。按http://www.cise.ufl.edu/research/sparse/matrices/中的说法
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As of Oct 2009, it contains 2272 problems (some of which are sequences of dozens of matrices). The largest has a dimension of almost 29 million, with 760 million nonzero entries.
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老外们合作都很紧密，网站开放程度比较高，资料详尽，url密密麻麻，思路有连续性，这点值得我们学习。