[SPARK-7127] [MLLIB] Adding broadcast of model before prediction for ensembles#6300

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BryanCutler wants to merge 8 commits intoapache:masterfrom

BryanCutler:bcast-ensemble-models-7127

Commits on May 20, 2015

[SPARK-7127] Adding broadcast of model before prediction in RandomForestClassifier
BryanCutler
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Commits on May 25, 2015

[SPARK-7127] Removed abstract class for broadcasting model, instead passing a prediction function as param to transform
BryanCutler
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Commits on Jun 15, 2015

[SPARK-7127] Applied broadcasting to remaining ensemble models
BryanCutler
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[SPARK-7127] Used modelAccessor parameter in predictImpl to access broadcasted model
BryanCutler
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[SPARK-7127] Removed accidental newline
BryanCutler
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Commits on Jul 14, 2015

[SPARK-7127] Simplified calls by overriding transformImpl and using broadcasted model in callUDF to make prediction
BryanCutler
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Commits on Jul 15, 2015