sp常见用法

1. sp.diags

# inputs:
[0.06896536 0.03290889 0.05405389 0.06451621 0.03508776 0.04255323
 0.4        0.05714307 0.4        0.07407343 0.08610969 0.0253165 ]
print(sp.diags(r_inv))
# output: 对角矩阵，但是是稀疏的。
 (0, 0)	0.06896536
  (1, 1)	0.03290889
  (2, 2)	0.05405389
  (3, 3)	0.06451621
  (4, 4)	0.035087757
  (5, 5)	0.042553235
  (6, 6)	0.4
  (7, 7)	0.057143074
  (8, 8)	0.4
  (9, 9)	0.07407343
  (10, 10)	0.08610969
  (11, 11)	0.025316505
# 稀疏矩阵直接和原大小矩阵相乘
r_mat_inv.dot(features)
# ouput:
features.shape