update changelog

CHANGELOG.md

@@ -6,7 +6,47 @@ Note that the project (and python wheel) is built from a duorepo (2 separate rep
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) since v1.0.0.
 
-## [Unreleased]
+## [Unreleased] - Changes: [KaldiAG](https://github.com/daanzu/kaldi-active-grammar/compare/v2.0.0...master) [KaldiFork](https://github.com/daanzu/kaldi-fork-active-grammar/compare/kag-v2.0.0...master)
+
+## [2.0.0](https://github.com/daanzu/kaldi-active-grammar/releases/tag/v2.0.0) - 2020-09-05 - Changes: [KaldiAG](https://github.com/daanzu/kaldi-active-grammar/compare/v1.8.0...v2.0.0) [KaldiFork](https://github.com/daanzu/kaldi-fork-active-grammar/compare/kag-v1.8.0...kag-v2.0.0)
+
+### Added
+
+* Native FST support, via direct wrapping of OpenFST, rather than Python text-format implementation
+    * Eliminates grammar (G) FST compilation step
+* Internalized many graph construction steps, via direct use of native Kaldi/OpenFST functions, rather than invoking separate CLI processes
+    * Eliminates need for many temporary files (FSTs, `.conf`s, etc) and pipes
+* Example usage for allowing mixing of free dictation with strict command phrases
+* Experimental support for "look ahead" graphs, as an alternative to full HCLG compilation
+* Experimental support for rescoring with CARPA LMs
+* Experimental support for rescoring with RNN LMs
+* Experimental support for "priming" RNNLM previous left context for each utterance
+
+### Changed
+
+* OpenBLAS is now the default linear algebra library (rather than Intel MKL) on Linux/MacOS
+    * Because it is open source and provides good performance on all hardware (including AMD)
+    * Windows is more difficult for this, and will be implemented soon in a later release
+* Default `tmp_dir` is now set to `[model_dir]/cache.tmp`
+* `tmp_dir` is now optional, and only needed if caching compiled FSTs (or for certain framework/option combinations)
+* File cache is now stored at `[model_dir]/file_cache.json`
+* Optimized adding many new words to the lexicon, in many different grammars, all in one loading session: only rebuild `L_disambig.fst` once at the end.
+* External interfaces: `Compiler.__init__()`, decoding setup, etc.
+* Internal interfaces: wrappers, etc.
+* Major refactoring of C++ components, with a new inheritance hierarchy and configuration mechanism, making it easier to use and test features with and without "activity"
+* Many build changes
+
+### Removed
+
+* Python 2.7 support: it may still work, but will not be a focus.
+* Google cloud speech-to-text removed, as an unneeded dependency. Alternative dictation is still supported as an option, via a callback to an external provider.
+
+### Deprecated
+
+* Separate CLI Kaldi/OpenFST executables
+* Indirect AGF graph compilation (framework==`agf-indirect`)
+* Non-native FSTs
+* parsing_framework==`text`
 
 ## [1.8.0](https://github.com/daanzu/kaldi-active-grammar/releases/tag/v1.8.0) - 2020-09-05 - Changes: [KaldiAG](https://github.com/daanzu/kaldi-active-grammar/compare/v1.7.0...v1.8.0) [KaldiFork](https://github.com/daanzu/kaldi-fork-active-grammar/compare/kag-v1.7.0...kag-v1.8.0)