Bryan Cutler created SPARK-19357:
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             Summary: Parallel Model Evaluation for ML Pipeline Tuning
                 Key: SPARK-19357
                 URL: https://issues.apache.org/jira/browse/SPARK-19357
             Project: Spark
          Issue Type: Sub-task
          Components: ML
            Reporter: Bryan Cutler


This is a first step of the parent task of Optimizations for ML Pipeline Tuning 
to perform model evaluation in parallel.  A simple approach is to naively 
evaluate with a possible parameter to control the level of parallelism.  There 
are some concerns with this:

* excessive caching of datasets
* what to set as the default value for level of parallelism.  1 will evaluate 
all models in serial, as is done currently. Higher values could lead to 
excessive caching.



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