New data import from exquisite-corpus

Significant changes in this data include:

- Added ParaCrawl, a multilingual Web crawl, as a data source.
  This supplements the Leeds Web crawl with more modern data.

  ParaCrawl seems to provide a more balanced sample of Web pages than
  Common Crawl, which we once considered adding, but found that its data
  heavily overrepresented TripAdvisor and Urban Dictionary in a way that
  was very apparent in the word frequencies.

  ParaCrawl has a fairly subtle impact on the top terms, mostly boosting
  the frequencies of numbers and months.

- Fixes to inconsistencies where words from different sources were going
  through different processing steps. As a result of these
  inconsistencies, some word lists contained words that couldn't
  actually be looked up because they would be normalized to something
  else.

  All words should now go through the aggressive normalization of
  `lossy_tokenize`.

- Fixes to inconsistencies regarding what counts as a word.
  Non-punctuation, non-emoji symbols such as `=` were slipping through
  in some cases but not others.

- As a result of the new data, Latvian becomes a supported language and
  Czech gets promoted to a 'large' language.
This commit is contained in:
Robyn Speer 2018-06-12 17:22:43 -04:00
parent 6235d88869
commit d5f7335d90
49 changed files with 35944 additions and 32624 deletions

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