Joseph K. Bradley created SPARK-10808:
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Summary: 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.
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