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https://issues.apache.org/jira/browse/SPARK-10808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley updated SPARK-10808:
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Description:
Based on feedback like [SPARK-10791], we should discuss the computational and
communication complexity of LDA and its optimizers in the MLlib Programming
Guide. E.g.:
* Online LDA can be faster than EM.
* To make online LDA run faster, you can use a smaller miniBatchFraction.
* Communication
** For EM, communication on each iteration is on the order of # topics *
(vocabSize + # docs).
** For online LDA, communication on each iteration is on the order of # topics
* vocabSize.
* Decreasing vocabSize and # topics can speed things up. It's often fine to
eliminate uncommon words, unless you are trying to create a very large number
of topics.
was:
Based on feedback like [SPARK-10791], we should discuss the computational and
communication complexity of LDA and its optimizers in the MLlib Programming
Guide. E.g.:
* Online LDA can be faster than EM.
* To make online LDA run faster, you can use a smaller miniBatchFraction.
* Communication
** For EM, communication on each iteration is on the order of # topics *
(vocabSize + # docs).
** For online LDA, communication on each iteration is on the order of # topics
* vocabSize.
* Decreasing vocabSize and # topics can speed things up.
> LDA user guide: discuss running time of LDA
> -------------------------------------------
>
> Key: SPARK-10808
> URL: https://issues.apache.org/jira/browse/SPARK-10808
> Project: Spark
> Issue Type: Documentation
> Components: Documentation, MLlib
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> Based on feedback like [SPARK-10791], we should discuss the computational and
> communication complexity of LDA and its optimizers in the MLlib Programming
> Guide. E.g.:
> * Online LDA can be faster than EM.
> * To make online LDA run faster, you can use a smaller miniBatchFraction.
> * Communication
> ** For EM, communication on each iteration is on the order of # topics *
> (vocabSize + # docs).
> ** For online LDA, communication on each iteration is on the order of #
> topics * vocabSize.
> * Decreasing vocabSize and # topics can speed things up. It's often fine to
> eliminate uncommon words, unless you are trying to create a very large number
> of topics.
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