Hi Pan,
There is a pull request that is supposed to fix the issue:
https://github.com/apache/spark/pull/9854
There is a workaround for saving/loading a model (however I am not sure if it
will work for the pipeline):
sc.parallelize(Seq(model), 1).saveAsObjectFile("path")
val sameModel = sc.objectFile[YourCLASS]("path").first()
Best regards, Alexander
From: HanPan [mailto:pa...@thinkingdata.cn]
Sent: Sunday, March 20, 2016 8:32 PM
To: dev@spark.apache.org
Cc: pa...@thinkingdata.cn
Subject: MLPC model can not be saved
Hi Guys,
I built a ML pipeline that includes multilayer perceptron classifier,
I got the following error message when I tried to save the pipeline model. It
seems like MLPC model can not be saved which means I have no ways to save the
trained model. Is there any way to save the model that I can use it for future
prediction.
Exception in thread "main" java.lang.UnsupportedOperationException:
Pipeline write will fail on this Pipeline because it contains a stage which
does not implement Writable. Non-Writable stage: mlpc_2d8b74f6da60 of type
class org.apache.spark.ml.classification.MultilayerPerceptronClassificationModel
at
org.apache.spark.ml.Pipeline$SharedReadWrite$$anonfun$validateStages$1.apply(Pipeline.scala:218)
at
org.apache.spark.ml.Pipeline$SharedReadWrite$$anonfun$validateStages$1.apply(Pipeline.scala:215)
at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:108)
at
org.apache.spark.ml.Pipeline$SharedReadWrite$.validateStages(Pipeline.scala:215)
at
org.apache.spark.ml.PipelineModel$PipelineModelWriter.<init>(Pipeline.scala:325)
at org.apache.spark.ml.PipelineModel.write(Pipeline.scala:309)
at org.apache.spark.ml.util.MLWritable$class.save(ReadWrite.scala:130)
at org.apache.spark.ml.PipelineModel.save(Pipeline.scala:280)
at
cn.thinkingdata.nlp.spamclassifier.FFNNSpamClassifierPipeLine.main(FFNNSpamClassifierPipeLine.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)
at
org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Thanks
Pan
