假设我有一个矩阵:
X = [
[0, 0, 0, 0, 0],
[0, 0, 1, 0, 0],
[0, 0, 0, 0, 0],
[2, 0, 0, 3, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 4, 0, 0, 0]
]
但它是以稀疏格式存储的:
# [row, column, value]
X_sparse = [
[1, 2, 1],
[3, 0, 2],
[3, 3, 3]
[6, 1, 4],
]
我也有一个向量
b = [1,2,3,4,5]
我希