From d51d6ba1547ae75ac76c9e6d8ea99e937eb7d09f Mon Sep 17 00:00:00 2001 From: Peter Rudenko Date: Mon, 16 Feb 2015 00:07:23 -0800 Subject: [Ml] SPARK-5804 Explicitly manage cache in Crossvalidator k-fold loop On a big dataset explicitly unpersist train and validation folds allows to load more data into memory in the next loop iteration. On my environment (single node 8Gb worker RAM, 2 GB dataset file, 3 folds for cross validation), saved more than 5 minutes. Author: Peter Rudenko Closes #4595 from petro-rudenko/patch-2 and squashes the following commits: 66a7cfb [Peter Rudenko] Move validationDataset cache to declaration c5f3265 [Peter Rudenko] [Ml] SPARK-5804 Explicitly manage cache in Crossvalidator k-fold loop --- mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala b/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala index b139bc8dcb..b07a68269c 100644 --- a/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala +++ b/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala @@ -108,6 +108,7 @@ class CrossValidator extends Estimator[CrossValidatorModel] with CrossValidatorP // multi-model training logDebug(s"Train split $splitIndex with multiple sets of parameters.") val models = est.fit(trainingDataset, epm).asInstanceOf[Seq[Model[_]]] + trainingDataset.unpersist() var i = 0 while (i < numModels) { val metric = eval.evaluate(models(i).transform(validationDataset, epm(i)), map) @@ -115,6 +116,7 @@ class CrossValidator extends Estimator[CrossValidatorModel] with CrossValidatorP metrics(i) += metric i += 1 } + validationDataset.unpersist() } f2jBLAS.dscal(numModels, 1.0 / map(numFolds), metrics, 1) logInfo(s"Average cross-validation metrics: ${metrics.toSeq}") -- cgit v1.2.3