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Results tagged with topic-models
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user 148774
A topic model is a type of statistical model for discovering the abstract "topics" that occur in a collection of documents.
12
votes
0
answers
2k
views
Is sparsity of topics a necessary condition for latent Dirichlet allocation (LDA) to work
I have been playing with the hyper-parameters of the latent Dirichlet allocation (LDA) model and am wondering how sparsity of topic priors play a role in inference.
I have not performed these experime …
- 3,602
5
votes
1
answer
10k
views
Why does lower perplexity indicate better generalization performance?
In the seminal paper on Latent Dirichlet Allocation, the authors state that,
A lower perplexity score indicates better generalization performance.
$perplexity(D_{test})=exp\Big\{-\frac{\sum_{d=1}^{M} …
- 3,602
2
votes
1
answer
395
views
Question about implementing nested Chinese Restaurant Process (nCRP)
I am trying to follow the original paper on nCRP by Blei et al., 2010 and am confused with it's implementation.
The authors describe the analogy for an nCRP as follows:
A tourist arrives at the c …
- 3,602