There are a number of good starting points, depending on your background and needs:
 

General

Brief tour (5-6 minutes)
Compare to other architectures (including speed), American National Corpus, British National Corpus, Google.

What kind of texts are in the corpus? Why not just use Google? Looking at recent changes in English (especially examples).
Commercial use or need more data Full text data, frequency lists, n-grams, and collocates.
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