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原文： https://machinelearningmastery.com/sparse-matrices-for-machine-learning/ 主要包含零值的矩阵称为稀疏矩阵，与大多数值非零的矩阵不同，称为密集。

Dictionary Of Keys based sparse matrix. Generate a sparse matrix of the given shape and density with uniformly distributed values. random(m, n[, density, format, dtype, ...]) Generate a sparse matrix ...

The sparse module of the popular SciPy Python library is widely used across applications in scientific computing, data analysis and machine learning. The standard implementation of SciPy is restricted ...