CODEWITHSUNDEEP
pythongensimlda
Salman Baqri
Salman Baqri

Reputation: 109

LDA Gensim Mallet setting alpha as 'auto'

I am using LDA for Topic Modelling in Python.Gensim implementation of LDA allows us to set alpha as 'auto' as below:

alpha ({numpy.ndarray, str}, optional) –
    
            ’asymmetric’: Uses a fixed normalized asymmetric prior of 1.0 / topicno.
    
            ’auto’: Learns an asymmetric prior from the corpus (not available if distributed==True).

For LDA Mallet wrapper provided in Gensim there is no option of setting alpha as auto.

Is there way to learn alpha from the corpus in LDA Mallet?

Upvotes: 1

Views: 1016

Answers (1)

Jaccar
Jaccar

Reputation: 1844

This is in the optimize_interval argument. From the wrapper documentation:

optimize_interval (int, optional) – Optimize hyperparameters every optimize_interval iterations

So although alpha is originally set (or left as the default), if you set optimize_interval then every n iterations, the alpha and beta will be optimised automatically.

Upvotes: 2

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