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author | Yanbo Liang <ybliang8@gmail.com> | 2016-04-25 14:08:41 -0700 |
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committer | Xiangrui Meng <meng@databricks.com> | 2016-04-25 14:08:41 -0700 |
commit | 9cb3ba1013a7eae11be8a00fa4a9c5308bb20195 (patch) | |
tree | eb275db612f3bc4f438aa426bb49c528d6fc0fe9 /mllib/src/main/scala | |
parent | 0c47e274ab8c286498fa002e2c92febcb53905c6 (diff) | |
download | spark-9cb3ba1013a7eae11be8a00fa4a9c5308bb20195.tar.gz spark-9cb3ba1013a7eae11be8a00fa4a9c5308bb20195.tar.bz2 spark-9cb3ba1013a7eae11be8a00fa4a9c5308bb20195.zip |
[SPARK-14312][ML][SPARKR] NaiveBayes model persistence in SparkR
## What changes were proposed in this pull request?
SparkR ```NaiveBayesModel``` supports ```save/load``` by the following API:
```
df <- createDataFrame(sqlContext, infert)
model <- naiveBayes(education ~ ., df, laplace = 0)
ml.save(model, path)
model2 <- ml.load(path)
```
## How was this patch tested?
Add unit tests.
cc mengxr
Author: Yanbo Liang <ybliang8@gmail.com>
Closes #12573 from yanboliang/spark-14312.
Diffstat (limited to 'mllib/src/main/scala')
-rw-r--r-- | mllib/src/main/scala/org/apache/spark/ml/r/NaiveBayesWrapper.scala | 52 | ||||
-rw-r--r-- | mllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala | 45 |
2 files changed, 94 insertions, 3 deletions
diff --git a/mllib/src/main/scala/org/apache/spark/ml/r/NaiveBayesWrapper.scala b/mllib/src/main/scala/org/apache/spark/ml/r/NaiveBayesWrapper.scala index b17207e99b..27c7e72881 100644 --- a/mllib/src/main/scala/org/apache/spark/ml/r/NaiveBayesWrapper.scala +++ b/mllib/src/main/scala/org/apache/spark/ml/r/NaiveBayesWrapper.scala @@ -17,16 +17,23 @@ package org.apache.spark.ml.r +import org.apache.hadoop.fs.Path +import org.json4s._ +import org.json4s.DefaultFormats +import org.json4s.JsonDSL._ +import org.json4s.jackson.JsonMethods._ + import org.apache.spark.ml.{Pipeline, PipelineModel} import org.apache.spark.ml.attribute.{Attribute, AttributeGroup, NominalAttribute} import org.apache.spark.ml.classification.{NaiveBayes, NaiveBayesModel} import org.apache.spark.ml.feature.{IndexToString, RFormula} +import org.apache.spark.ml.util._ import org.apache.spark.sql.{DataFrame, Dataset} private[r] class NaiveBayesWrapper private ( - pipeline: PipelineModel, + val pipeline: PipelineModel, val labels: Array[String], - val features: Array[String]) { + val features: Array[String]) extends MLWritable { import NaiveBayesWrapper._ @@ -41,9 +48,11 @@ private[r] class NaiveBayesWrapper private ( .drop(PREDICTED_LABEL_INDEX_COL) .drop(naiveBayesModel.getFeaturesCol) } + + override def write: MLWriter = new NaiveBayesWrapper.NaiveBayesWrapperWriter(this) } -private[r] object NaiveBayesWrapper { +private[r] object NaiveBayesWrapper extends MLReadable[NaiveBayesWrapper] { val PREDICTED_LABEL_INDEX_COL = "pred_label_idx" val PREDICTED_LABEL_COL = "prediction" @@ -74,4 +83,41 @@ private[r] object NaiveBayesWrapper { .fit(data) new NaiveBayesWrapper(pipeline, labels, features) } + + override def read: MLReader[NaiveBayesWrapper] = new NaiveBayesWrapperReader + + override def load(path: String): NaiveBayesWrapper = super.load(path) + + class NaiveBayesWrapperWriter(instance: NaiveBayesWrapper) extends MLWriter { + + override protected def saveImpl(path: String): Unit = { + val rMetadataPath = new Path(path, "rMetadata").toString + val pipelinePath = new Path(path, "pipeline").toString + + val rMetadata = ("class" -> instance.getClass.getName) ~ + ("labels" -> instance.labels.toSeq) ~ + ("features" -> instance.features.toSeq) + val rMetadataJson: String = compact(render(rMetadata)) + sc.parallelize(Seq(rMetadataJson), 1).saveAsTextFile(rMetadataPath) + + instance.pipeline.save(pipelinePath) + } + } + + class NaiveBayesWrapperReader extends MLReader[NaiveBayesWrapper] { + + override def load(path: String): NaiveBayesWrapper = { + implicit val format = DefaultFormats + val rMetadataPath = new Path(path, "rMetadata").toString + val pipelinePath = new Path(path, "pipeline").toString + + val rMetadataStr = sc.textFile(rMetadataPath, 1).first() + val rMetadata = parse(rMetadataStr) + val labels = (rMetadata \ "labels").extract[Array[String]] + val features = (rMetadata \ "features").extract[Array[String]] + + val pipeline = PipelineModel.load(pipelinePath) + new NaiveBayesWrapper(pipeline, labels, features) + } + } } diff --git a/mllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala b/mllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala new file mode 100644 index 0000000000..7f6f147532 --- /dev/null +++ b/mllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala @@ -0,0 +1,45 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.spark.ml.r + +import org.apache.hadoop.fs.Path +import org.json4s.DefaultFormats +import org.json4s.jackson.JsonMethods._ + +import org.apache.spark.SparkException +import org.apache.spark.ml.util.MLReader + +/** + * This is the Scala stub of SparkR ml.load. It will dispatch the call to corresponding + * model wrapper loading function according the class name extracted from rMetadata of the path. + */ +private[r] object RWrappers extends MLReader[Object] { + + override def load(path: String): Object = { + implicit val format = DefaultFormats + val rMetadataPath = new Path(path, "rMetadata").toString + val rMetadataStr = sc.textFile(rMetadataPath, 1).first() + val rMetadata = parse(rMetadataStr) + val className = (rMetadata \ "class").extract[String] + className match { + case "org.apache.spark.ml.r.NaiveBayesWrapper" => NaiveBayesWrapper.load(path) + case _ => + throw new SparkException(s"SparkR ml.load does not support load $className") + } + } +} |