[Topic-models] Why does alpha serve as a scalar in blei's code

PENG Peng ppeng at ust.hk
Sat Jan 15 08:45:06 EST 2011

Hi everyone,

   I do not quite understand why Blei's LDA code considers the parameter
alpha as a scalar so that the learned dirichlet distribution is a
K-dimensional symmetric Dirichlet. In my understanding, the elements in
vector alpha could be different. Can anyone explain for me? Thank you
so much.


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