3
參考https://stats.stackexchange.com/questions/15798/how-to-calculate-a-gaussian-kernel-effectively-in-numpy,提供了用於計算預先計算的內核矩陣的解決方案。Python中的內核方法
from scipy.spatial.distance import pdist, squareform
X = loaddata() # this is an NxD matrix, where N is number of items and D its dimensions
pairwise_dists = squareform(pdist(X, 'euclidean'))
K = scip.exp(pairwise_dists/s**2)
如果輸入是有向圖的加權鄰接矩陣,那麼如何實現上面的Guassin核?