Guess the date of reddits (large edition)
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Guess a reddit date based on its text.
This is larger version with more reddits and subrredits (topics) than in <https://gonito.net/challenge/guess-reddit-date>.

Output label is `FLOAT-YEAR`, a human friendly timestamp.
`FLOAT-YEAR`=1970 + `posix_time`/(60\*60\*24\*365.25)

Sources
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Data taken from <https://archive.org/details/2015_reddit_comments_corpus>.