http://freemind.pluskid.org/machine-learning/sparsity-and-some-basics-of-l1-regularization/
Sparsity 是当今机器学习领域中的一个重要话题。John Lafferty 和 Larry Wasserman 在 2006 年的一篇评论中提到:
Some current challenges … are high dimensional data, sparsity, semi-supervised learning, the relation between computation and risk, and structured prediction.John Lafferty
and Larry Wasserman. Challenges in statistical machine learning. Statistica Sinica. Volume 16, Number 2, pp. 307-323......
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