Understanding the topic significance of LDA

[H Y]

Hi there, 

I noticed that the print_topics() of LDA models says "Get the most significant topics" and "The number of topics to be selected, if -1 - all topics will be in result (ordered by significance)" in the documentation https://radimrehurek.com/gensim/models/ldamodel.html. 

However, I failed to identify the logic behind it. May I know what mechanisms are utilised to calculate the topic-level significance? 

Much appreciated :)

Regards,

H Y

[Radim Řehůřek]

Hi H Y,

the LDA topics are ordered by alpha, the per-topic LDA hyperparameter (stored as model.alpha).

Hope that helps,

Radim

[H Y]

Hi Radim,

Thanks for the reply. That's great to know!

Best regards,

Hang

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