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Questions tagged [dirichlet]

The Dirichlet distribution is a family of continuous multivariate probability distributions.

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Is there a derichlet-tree learning algorithm written in Python

I want to learn a decision-tree based on dirichlet distribution (namely a derichlet-tree). Which Python (or possibly other) libraries/packages enables such algorithm?
SSSOF's user avatar
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1 vote
1 answer
237 views

Understanding the plate notation for gaussian mixture models and latent dirichlet allocation

I am having troubles understanding the plate notation being used in LDA and GMM. In specific the class-variable deciding which parameters that generates the observation in GMM's and the topic-...
richard's user avatar
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1 vote
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Two sets of topics/words in Topic Modeling

In short, the question is: I have two sets of words per document. I would like to extract two sets of topics per document corresponding to sets of words. To be more precise: Document(d) can be ...
aloskam's user avatar
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2 votes
0 answers
81 views

What hyperparameter values does the LDA mallet model use by default? Is it true that the formula to calculate alpha = 5.0/n(topics)?

I am trying to figure out the default $\alpha$ & $\eta$ values used by mallet LDA, but there is not a lot of information on this. I did find a couple of answers, with no proper references, saying ...
SAMUEL DURAIVEL's user avatar
1 vote
1 answer
87 views

Hierarchical dirichlet process results

I am thinking about using hierarchical dirichlet process to model a patent dataset. I've seen that HDP uses a base distribution and assumes that every topic comes from that base distribution. The ...
Muntaser's user avatar
2 votes
1 answer
163 views

Where can I learn the complete mathematics involved in LDA?

I have come across Latent Dirichlet Allocation (LDA) on multiple occasions while reading about sentiment analysis and recommender systems. Where can I find good reading material which explains the ...
Harish Reddy's user avatar
0 votes
1 answer
1k views

Chinese restaurant process vs Dirichlet Process

On Wikipedia Dirichlet Process page, regarding the connection between the Chinese restaurant process and the Dirichlet process it's state the following If one associates draws from the base ...
Tommaso Bendinelli's user avatar
5 votes
1 answer
1k views

Combine two sets of clusters

I have two sets of topics obtained from two different sets of news paper articles. In other words, Cluster_1 = ${x_1, x_2, ..., x_n}$ includes the main topics of 'X' news paper set and Cluster_2 = ${...
Volka's user avatar
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5 votes
1 answer
1k views

How do you work with Latent Dirichlet Allocation in practice

One need to provide LDA with a predefined number of latent topics. Let say I have a text corpus in which I hypothesize there are 10 major topics, all composed of 10 minor subtopics. My objective is to ...
Robin's user avatar
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