以AIR-LAP1242AG-C-K9为例, 1242的瘦AP。
1、 首先准备回退到胖AP的镜像文件。 我拿到的是一个“c1240-k9w7-tar.124-10b.JA3.tar”的tar包压缩文件。
2、 准备TFTP的环境。（还是用3CDaemon吧，今天曾经用过另外两个tftp软件，同样的条件都无法更新成功。而且3CDaemon还可以随时看到监控记录，便于分析问题），把目录指向要升级的镜像目录。
TFTP的服务器主机ip地址设置为10.0.0.2 255.0.0.0 镜象文件改名为“c1240-k9w7-tar.default”(IP地址和镜像文件名这样改从后面的提示中可以知道是为什么)
3、 超级终端、控制口连接到AP，以便监控状态。
4、 按住ap上的mode键，然后插上电源，稍等一会，出现如下提示
flashfs[0]: 3 files, 2 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 15998976
flashfs[0]: Bytes used: 1867776
flashfs[0]: Bytes available: 14131200
flashfs[0]: flashfs fsck took 26 seconds.
Base ethernet MAC Address: 00:1d:a1:ff:3c:dc
Initializing ethernet port 0...
Reset ethernet port 0...
Reset done!
ethernet link up, 100 mbps, full-duplex
Ethernet port 0 initialized: link is up
button is pressed, wait for button to be released...
看到上面wait的提示后，松开mode键
button pressed for 29 seconds
process_config_recovery: set IP address and config to default 10.0.0.1
process_config_recovery: image recovery
image_recovery: Download default IOS tar imagetftp://255.255.255.255/c1240-k9w7-tar.default
examining image...
出现上面提示。（从这里可以看出，在这个状态下，ap把自己的以太口设置为10.0.0.1的ip地址，然后广播去找tftp服务器下的c1240-k9w7-tar.default镜像文件）
如果上述设置正确的话，就会开始更新了。
5、 更新时的屏幕显示如下：
extracting info (275 bytes)
Image info:
Version Suffix: k9w7-.124-10b.JA3
Image Name: c1240-k9w7-mx.124-10b.JA3
Version Directory: c1240-k9w7-mx.124-10b.JA3
Ios Image Size: 4813312
Total Image Size: 5560832
Image Feature: UNKNOWN
Image Family: C1240
Wireless Switch Management Version: 1.0
Extracting files...
extracting info (275 bytes)
c1240-k9w7-mx.124-10b.JA3/ (directory) 0 (bytes)
c1240-k9w7-mx.124-10b.JA3/html/ (directory) 0 (bytes)
c1240-k9w7-mx.124-10b.JA3/html/level/ (directory) 0 (bytes)
c1240-k9w7-mx.124-10b.JA3/html/level/1/ (directory) 0 (bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/appsui.js (557 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/back.shtml (498 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/cookies.js (5026 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/forms.js (17542 bytes)...
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/sitewide.js (16510 bytes)...
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/config.js (23370 bytes).....
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/stylesheet.css (3214 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/popup_capabilitycodes.shtml.gz(1016 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/filter.js.gz (1802 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/filter_vlan.js.gz (1459bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/filter_mac_ether.js.gz (1710bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/security.js.gz (957 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/vlan.js.gz (955 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ssid.js.gz (4107 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/dot1x.js.gz (982 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/network-if.js.gz (1967 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/stp.js.gz (952 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_assoc.shtml.gz (6121bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_event-log.shtml.gz (4398bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_home.shtml.gz (6384bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_network-if.shtml.gz (4064bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_network-map.shtml.gz (4357bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_services.shtml.gz (4181bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_system-sw.shtml.gz (3382bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/ap_contextmgr.shtml.gz (4187bytes).
c1240-k9w7-mx.124-10b.JA3/html/level/1/images/ (directory) 0 (bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/ap_title_appname.gif(2115 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button.gif (1211bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button_1st.gif(1171 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button_cbottom.gif(318 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button_current.gif (1206bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button_endcap.gif(878 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button_encap_last.gif (333bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button_last.gif(386 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_button_nth.gif(1177 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_leftnav_dkgreen.gif (869bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_leftnav_green.gif(879 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_leftnav_upright.gif(64 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/1/images/apps_leftnav_yellow.gif (881bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/arrowdown_red.gif (108bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/arrowup_green.gif (108bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/corner_ur_7.gif (53bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/dkgreenmask11_up.gif(113 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/dkgreenmask28_upright.gif(110 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/1/images/grn_vertlines_bottom.gif (149bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/grn_vertlines_top.gif(141 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/hinav_plus.gif (56bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/left_bkg.gif (146bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/list_da
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/logo.gif (29454bytes)......
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/pixel.gif (49 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/sitewide_downleft.gif(53 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/sitewide_help_off.gif(934 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/sitewide_help_on.gif(934 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/sitewide_print_off.gif(111 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/sitewide_print_on.gif(111 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/spacer.gif (49 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/1/images/whitemask11_botleft.gif (62 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/1/images/whitemask11_upright.gif (61bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_alert.gif (73bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_critical.gif (73bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_debugging.gif(73 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_emergency.gif(73 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_error.gif (73bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_information.gif(73 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_notification.gif(73 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/event_warning.gif (73bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/1/images/check_mark.gif (71bytes)
c1240-k9w7-mx.124-10b.JA3/html/level/15/ (directory) 0 (bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_assoc_adv.shtml.gz (4549bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_event-log_config-options.shtml.gz(6199 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_event-log_notif-options.shtml.gz(3186 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_express-setup.shtml.gz(11413 bytes)..
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_express-security.shtml.gz(13959 bytes)...
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/def_broadcast-ssid.shtml.gz(1259 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/def_no-security.shtml.gz(1578 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/def_eap-security.shtml.gz(1787 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/def_wep-security.shtml.gz(1593 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/def_wpa-security.shtml.gz(1849 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-if_ipaddress.shtml.gz (5075bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-if_802-11.shtml.gz(6688 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-if_802-11_b.shtml.gz (6827bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-if_802-11_c.shtml.gz (24103bytes).....
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/dBm_mW_translation_table.shtml.gz(1402 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-if_802-11_d.shtml.gz (4569bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-if_ethernet.shtml.gz (4821bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-if_ethernet_b.shtml.gz (5905bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_network-map_ap-adjacent-list.shtml.gz(4277 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec.shtml.gz (7747bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ap-client-security.shtml.gz(26694 bytes).....
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ap-key-security.shtml.gz (12461bytes)..
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_local-admin-access.shtml.gz(7468 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_network-security_a.shtml.gz(10738 bytes)..
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_network-security_b.shtml.gz(5798 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_lrs.shtml.gz (5575bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_lrs_b.shtml.gz (9045bytes)..
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_lrs_c.shtml.gz (6689bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ap-client-security-adv_a.shtml.gz(5473 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ap-client-security-adv_b.shtml.gz(5552 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ap-client-security-adv_c.shtml.gz(5157 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ap-client-security-adv_d.shtml.gz(4094 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ids_mfp.shtml.gz(4401 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_ids_mfp_stats.shtml.gz (4129bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_dot1x-security.shtml.gz (6948bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_dot1x-certificates.shtml.gz(11666 bytes)..
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_sec_dot1x-cert_fingerprint.shtml.gz(573 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_arp.shtml.gz(3508 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_cdp.shtml.gz(5611 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_console-telnet.shtml.gz(7196 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_dns.shtml.gz(4078 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_filters.shtml.gz(5712 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_filters-ip.shtml.gz (8948bytes)..
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_filters-mac.shtml.gz(4491 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_filters-ether.shtml.gz(4343 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_hot-standby.shtml.gz (6000bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_http.shtml.gz(6387 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_mobile-ip-b.shtml.gz (7198bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_mobile-ip-c.shtml.gz(4619 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_mobile-ip-d.shtml.gz (5679bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_mobile-ip.shtml.gz (6565bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_qos-traffic.shtml.gz(8666 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_qos.shtml.gz(12688 bytes)..
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_qos_adv.shtml.gz(4939 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_voice.shtml.gz(4577 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_voice-traffic.shtml.gz(6856 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_snmp.shtml.gz(8504 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_sntp.shtml.gz(6300 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_vlan.shtml.gz(13282 bytes)..
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_services_stp.shtml.gz(7081 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_stationview-client_ltest.shtml.gz(5965 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_system-sw_upgrade-b.htm(225 bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_system-sw_upgrade-b.shtml.gz(6713 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_system-sw_upgrade.htm(223 bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_system-sw_upgrade.shtml.gz (6746bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_system-sw_upgrade_poll.htm (228bytes)
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_system-sw_upgrade_poll.shtml (3590bytes)
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_system-sw_sysconfig.shtml.gz(7150 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_stationview-client.shtml.gz (6068bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_contextmgr_ap.shtml.gz(5298 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/html/level/15/ap_contextmgr_scm.shtml.gz(5793 bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_contextmgr_scm-groups.shtml.gz (8002bytes).
extractingc1240-k9w7-mx.124-10b.JA3/html/level/15/ap_contextmgr_scm_summary.shtml.gz(5559 bytes).
extracting c1240-k9w7-mx.124-10b.JA3/c1240-k9w7-mx.124-10b.JA3 (4546916bytes)..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
extracting c1240-k9w7-mx.124-10b.JA3/7101.img (131328bytes)............................
extracting c1240-k9w7-mx.124-10b.JA3/6701.img (131328bytes)............................
extracting c1240-k9w7-mx.124-10b.JA3/info (275 bytes)
extracting info.ver (275 bytes)
Deleting current version...
Deleting flash:/c1240-rcvk9w8-mx...done.
New software image installed in flash:/c1240-k9w7-mx.124-10b.JA3
Configuring system to use new image...done.
Requested system reload in progress...download took about 408 seconds
Loading"flash:/c1240-k9w7-mx.124-10b.JA3/c1240-k9w7-mx.124-10b.JA3"...###################################################################################################################################################################################################################################################################################################################################################################################################################################################################################
File "flash:/c1240-k9w7-mx.124-10b.JA3/c1240-k9w7-mx.124-10b.JA3"uncompressed and installed, entry point: 0x3000
executing...
Restricted Rights Legend
Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Da
Software clause at DFARS sec. 252.227-7013.
cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706
Cisco IOS Software, C1240 Software (C1240-K9W7-M), Version 12.4(10b)JA3,RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Wed 19-Mar-08 18:25 by prod_rel_team
Image text-base: 0x00003000, da
Initializing flashfs...
flashfs[1]: 145 files, 7 directories
flashfs[1]: 0 orphaned files, 0 orphaned directories
flashfs[1]: Total bytes: 15998976
flashfs[1]: Bytes used: 5491200
flashfs[1]: Bytes available: 10507776
flashfs[1]: flashfs fsck took 4 seconds.
flashfs[1]: Initialization complete....done Initializing flashfs.
Radio 1 A506 7100 E8000000 A0000000 80000000 3
Radio 1 A506 6700 E8000100 A0040000 80010000 2
tx_paks 991
tx_paks 495
This product contains cryptographic features and is subject to United
States and local country laws governing imp
use. Delivery of Cisco cryptographic products does not imply
third-party authority to imp
Imp
compliance with U.S.and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S.and local laws, return this product immediately.
A summary of U.S.laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
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cisco AIR-LAP1242AG-C-K9 (PowerPCElvis) processor (revision A0) with24566K/8192K bytes of memory.
Processor board ID FOC12072F7H
PowerPCElvis CPU at 262Mhz, revision number 0x0950
Last reset from power-on
1 FastEthernet interface
2 802.11 Radio(s)
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:1D:A1:FF:3C:DC
Part Number : 73-10256-06
PCA Assembly Number : 800-26918-05
PCA Revision Number : A0
PCB Serial Number : FOC12072F7H
Top Assembly Part Number : 800-29152-02
Top Assembly Serial Number : FOC12072F7H
Top Revision Number : A0
Product/Model Number : AIR-LAP1242AG-C-K9
Press RETURN to get started!
以上即完成整个ap从瘦变胖的过程。
在分类算法中，确定对于分类效果好坏的变量的重要性时，并不一定需要从变量与分类标签的相关性出发，实际上，决定分类效果好坏的是不同类别的同一变量的差异性，此时，该变量的差异越大，基于此变量的分类效果就会越好。之前，讨论过，如何确定变量的重要性，有基于决策树分类划分的变量，也有基于逐步回归拟合的效果，其实质，在分类中，应是不同类别中具有较大差异的变量，分类的差异实际上就是靠这些变量体现出来的。
一、Promethus简介Prometheus基本原理是通过HTTP协议周期性抓取被监控组件的状态，这样做的好处是任意组件只要提供HTTP接口就可以接入监控系统，不需要任何SDK或者其他的集成过程。这样做非常适合虚拟化环境比如VM或者Docker 。输出被监控组件信息的HTTP接口被叫做exporter 。目前互联网公司常用的组件大部分都有exporter可以直接使用，比如Varnish、Ha..._prometheus windows monitor
HBase VersionJDK 6JDK 7JDK 81.2Not Supportedyesyes1.1Not SupportedyesRunning with JDK 8 will work but is not well
mac下svn问题 —— command not found在mac os 10.8中，svn Command line tools是没有自动安装的，这样的话，svn 命令行就会失效，解决办法：1.打开xcode偏好设置（comand+，）-->"Download" -->Components:2.点击“Command line tools”下载，下载完成之后安装。3.安装
图片 转 pdf代码import globimport fitzimport osdef img2pdf(img_path): pdf_path = img_path.replace("png","pdf") print("pdf文件路径为:",pdf_path) doc = fitz.open() imgdoc = fitz.open(img_path,..._img_path.replace
一.证书简介 1.什么是SSL数字证书 SSL 数字证书包括一个完整的秘钥对,公钥和私钥,这两个是成套的.公钥加密数据,私钥解密. 2.SSL的CA机构签名和自签名 自签名就是自己给证书签名,客户端不信任会报红叉号. CA机构签名客户受信.有 亚马逊,沃通,亚洲诚信 3.SSl标准证书生成流程 (1)首先需要你生成.CSR证书请求文件,如使用OpenSSl工具 会生成...
比较hive数据库与mysql数据库_hive sql和mysql区别
进程是如何工作的：当系统启动的时候，内核先把一些自己的程序初始化为进程，然后运行一个叫做init的程序。init再依次运行一系列的称为init脚本的shell脚本（位于/etc），它们可以启动所有的系统服务。其中许多系统服务以守护(daemon)程序的形式实现，守护程序仅在后台运行，没有任何用户接口。这样，即使我们没有登录系统，至少系统也在忙于执行一些例行事务。内核维护每个进程的信息，以此
sudo aptitude install libmcrypt-dev 或者sudo apt-get install php5-mcrypt模块安装完毕后，将mcrypt模块加载sudo php5enmod mcrypt检查：/etc/php5/apache2/conf.d/ /etc/php5/mods-available/有mcrypt.ini文件随后重启a
三级菜单拖拽排序，各级互不影响,理论上可以无限级菜单一直下去，根据菜单级别修改下js就好
一、官网下载：https://nodejs.org/zh-cn/download/二、过程点击安装，下一步D:\Program Files\nodejs一路nextok三、打开终端：输入node -vnpm -v查看版本四、新建两个文件夹五、配置终端输入npm config set prefix "D:\Program Files\nodejs\node_global"npm config set cache "D:\Program Files\nodejs\node_ca_/www/server/nodejs/v14.17.6/bin/pnpm -> /www/server/nodejs/v14.17.6/lib/node
unique_ptr只让1个智能指针管理资源，不会让多个智能指针管理同一个资源。部分源码：template<class _Ty, class _Dx> // = default_delete<_Ty> class unique_ptr : public _Unique_ptr_base<_Ty, _Dx> { // non-copyable pointer to an objectpublic: typedef _Unique_ptr_base&_c++ element type