算法稀疏度 (M,N)	(6,16)	(6,16)	(12,16)	(12,32)	(12,128)	(12,256)	(12,1000)
算法稀疏度 (M,N)
ETF	√	√	√	√	√	√	√
ETF	Ignore	Ignore	0.5s	0.5s	2s	4s	15s
OMP	√	×	√	×	×	×	×
OMP	Ignore	0.5s	0.5s	2.5s	10s	22s	92s
BP	√	×	√	×	×	×	×
BP	300s	370s	370s	390s	460s	500s	1060s