1. from here.
diagonalReturn specified diagonals.
diagflatCreate a 2-D array with the flattened input as a diagonal.
traceSum along diagonals.
triuUpper triangle of an array.
trilLower triangle of an array.
2. DTW distance. dtaidistance
from dtaidistance import dtw ds = dtw.distance_matrix_fast(x)
3. sparce matrix in csr format.
4. Bug: AttributeError: module ‘community‘ has no attribute ‘best_partition‘
import community
但是安装包是不是安装community,而是安装pip intall python-louvain.
原文：https://www.cnblogs.com/dulun/p/12210829.html