基于pca降维的特征不变特性变换方法（sift），希望对研究特征提取的朋友有帮助！-PCA dimensionality reduction based on the characteristics of the same characteristics of transformation method (sift), hope that the study of feature extraction has to help a friend!
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001454s ]
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:0.079548s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001114s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002156s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001362s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005307s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001119s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.007107s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015385s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001408s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 112326 [ RunTime:0.023255s ]
