Table 1.

Summary the speed of five local based methods

Irrelevant feature NO.	Cost time(s)
	LHDA	LDPP	LSDA	LM-NNDA	I-Relief
100	18.82	2.09	0.05	57.86	3.23
200	40.24	2.63	0.07	134.36	7.72
300	87.96	3.00	0.11	632.91	11.83
400	139.13	3.31	0.25	487.89	30.71
500	203.28	3.60	0.24	493.70	35.03
600	285.81	3.58	0.35	560.68	61.91
700	366.59	5.45	0.34	651.41	73.77
800	505.73	6.05	0.32	758.55	83.78
900	655.34	6.58	0.39	972.84	95.71
1000	699.42	7.11	0.35	1201.89	108.58