Replicated softmax

[Fede-Rausa]

Adding Replicated Softmax (a restricted boltzmann machine for topic modeling) and Over Replicated Softmax (a deep version of the RSM) models to the octis topic models list.
Both can be currently evaluated only on classification, diversity and coherence metrics, but support locally a fast computation for the perplexity upper bound (that is supported also for the LDA in the gensim implementation, used by octis).

[silviatti]

Hi Federico, regarding the Python 3.8 error, it seems that some libraries have dropped support for python 3.8. I think it's time to deprecate it. Could you please remove Python 3.8 from python-publish.yml and any other related references?

Also, please add tests to ensure everything works as expected. I don't currently have time to verify the implementation manually, but adding tests will give us more confidence and serve as guardrails. You can follow the same patterns as in: https://github.com/MIND-Lab/OCTIS/blob/master/tests/test_octis.py and https://github.com/MIND-Lab/OCTIS/blob/master/tests/test_optimization.py.

Lastly, could you run a formatter (e.g., ruff) on the files you added?

Thanks,

Silvia

[Fede-Rausa]

Following Your advice, the old tests are passed.
Now the build process works for 3.9 and 3.10. I will supply soon the test functions for the RSM and oRSM, plus a better formatting. Thank You for the support.

Best regards,

Federico