Added feature importance methods based on cluster differences #102
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…pic and Top2Vec more flexible
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I already started working on a fighting-words based feature importance estimation method here: #75
Since then I have found a better method for measuring semantic difference between clusters based on linear classifiers.
I decided to use LinearDiscrimantAnalysis since it is orders of magnitudes faster than other methods, and it takes forever to estimate feature importance for each of the levels of the hierarchy otherwise when reducing the number of topics.
I am also planning to add supervised topic modelling based on these feature importance methods in the near future.