Comment by minimaxir

Since it was not mentioned in the post, here's a direct link to the Reddit comment corpus likely being used: http://files.pushshift.io/reddit/comments/

The full table (up to end of 2015) is available on BigQuery, with separate tables for each month thereafter: https://bigquery.cloud.google.com/table/fh-bigquery:reddit_p... (there is a similar table for comments)

And here's a year-old post I wrote on how to use that Reddit dataset with BigQuery: http://minimaxir.com/2015/10/reddit-bigquery/