GitLab

* add word_ids and simplify

* simplify

* add word_ids to be removed later

* remove word_ids

* seems to work

* tweak

* transpose word_z

* add word_ids example

* check api compatibility

* improve compatibility

* update doc

* tweak verbose

* restore word_z layout; tweak

* tweak

* tweak doc

* word_cT

* use log_weight and some other tweaks

* rewrite README

* update equations

* rewrite for clarity and pass tests

* tweak

* bugfix import

* fix unit test

* fix mult to be the same as old versions

* tweak

* could be a bugfix

* 0/0=nan

* add doc_subgraph utility function

* minor cache optimization

* minor cache tweak

* add environmental variable to trade cache speed for memory

* update README

* tweak

* add sparse update pass unit test

* simplify sparse update

* improve low-memory efficiency

* tweak

* add sample expectation scores to allow resampling

* simplify

* update comment

* avoid edge cases

* bugfix pred scores

* simplify

* add save function
Co-authored-by: Yifei Ma <yifeim@amazon.com>
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>
Co-authored-by: Jinjing Zhou <VoVAllen@users.noreply.github.com>