Data in the "project_topics" table is missing

[jwarz]

A lot of project topics are missing in the table "project_table" (2019-01-01). What is the reason for that and will that be changed in the future?

I have compared three topics, to demonstrate the difference between the GHTorrent data and the GitHub data:

Topic // # of entries in GHTorrent // # of occurrences on GitHub

"ghtorrent" // 1 // 11
"facebook" // 74 // 2,107
"pytorch" // 270 // 4,527