Latent Dirichlet Allocation - Parameters alpha and beta

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Kai Friedrich 2020-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/546434-latent-dirichlet-allocation-parameters-alpha-and-beta

编辑： Kai Friedrich 2020-6-11

Hello,

I am building an LDA model for research purposes and I am struggeling with regard to the exact definiton of the hyperparameters in the "fitlda" matlab function.

I consider the property "InitialTopicConcentration" to be the alpha hyperparameter (parameter of the dirichlet distribution) and "WordConcentration" to be beta hyperparamter of the LDA model (Blei et al, 2003).

Is that correct?

Given that this is true, when selecting number of topic T=50:

When I select "InitialTopicConcentration" to be 1, what is my alpha value then?

and what is beta value, when setting "WordConcentration" of the LDA to 0.1?

Thanks