利用C＋＋语言开发的BP算法，并将其封装在类中，用户可以自己设定参数，实现对BP网络的训练。-use C++ language BP algorithm, which is encapsulated in class, users can set their own parameters to achieve BP network training.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.003892s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.124991s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002453s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002565s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003854s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002116s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015542s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001965s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 88182 [ RunTime:0.001363s ]
