随机矩阵乘法：外积抽样与 importance weighting
把矩阵乘法写成外积之和，并用 importance weighting 构造无偏的随机矩阵乘法估计量。
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EXPLORATIONS IN SIMULATION, LEARNING, AND SYSTEMS.
把矩阵乘法写成外积之和，并用 importance weighting 构造无偏的随机矩阵乘法估计量。