Mathieu DESPRIEE created SPARK-21257:
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Summary: LDA : create an Evaluator to enable cross validation
Key: SPARK-21257
URL: https://issues.apache.org/jira/browse/SPARK-21257
Project: Spark
Issue Type: New Feature
Components: ML
Affects Versions: 2.1.1
Reporter: Mathieu DESPRIEE
I suggest the creation of an LDAEvaluator to use with CrossValidator, using
logPerplexity as a metric for evaluation.
Unfortunately, the computation of perplexity needs to access some internal data
of the model, and the current implementation of CrossValidator does not pass
the model being evaluated to the Evaluator.
A way could be to change the Evaluator.evaluate() method to pass the model
along with the dataset.
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