The problem of python crawler

Link analysis (pagerank, trustrank), feature extraction (page quality, authority, topic, linear / non-linear regression, LDA) are preferred.

what is the meaning of link analysis feature extraction here?

Sep.16,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3c26f-2c2f6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3c26f-2c2f6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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