GitLab

* add lda model

* tweak latent dirichlet allocation

* Update README.md

* Update README.md

* update example index

* update header

* minor tweak

* add example test

* update doc

* Update README.md

* Update README.md

* add partial_fit for free

* Update examples/pytorch/lda/lda_model.py
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>

* Update examples/pytorch/lda/example_20newsgroups.py
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>

* Update lda_model.py

* bugfix torch Gamma uses rate parameter
Co-authored-by: Yifei Ma <yifeim@amazon.com>
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>