chatter v0.8.0.0 Release Notes
Release Date: 2015-09-30 // over 8 years ago-
Added a Document type to better store term count indexes (essentially TermVectors with integer values).
Used the Document type for tf_idf; this changed the API, and is the reason for the B-level version bump. (also done for performance)
A number of non-breaking performance improvements (e.g., not using foldl in a few places.)
These changes, and much of 0.7.0.0 are due to work by Tristan Ravitch & Jonathan Daugherty.