[MAHOUT-1638] H2O bindings fail at drmParallelizeWithRowLabels(...)

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Fix Version/s: 0.10.0
• Labels: DSL h2o scala
• Assignee: Andrew Palumbo
• Reporter: Andrew Palumbo
• Created: 27/Jan/15 00:22
• Updated: 13/Apr/15 09:57
• Resolved: 03/Apr/15 17:03

Description

The H2OHelper.drmFromMatrix(...) function fails when trying to write row label String keys to a water.fvec.Vec.:

 java.lang.IllegalArgumentException: Not a String
  at water.fvec.Chunk.set_impl(Chunk.java:507)
  at water.fvec.Chunk.set0(Chunk.java:469)
  at water.fvec.Chunk.set(Chunk.java:371)
  at water.fvec.Vec$Writer.set(Vec.java:803)
  at org.apache.mahout.h2obindings.H2OHelper.drmFromMatrix(H2OHelper.java:331)
  at org.apache.mahout.h2obindings.H2OEngine$.drmParallelizeWithRowLabels(H2OEngine.scala:83)                                                                   
  at org.apache.mahout.math.drm.package$.drmParallelizeWithRowLabels(package.scala:67)

This causes an exception when calling drm.drmParallelizeWithRowLabels(...)

To reproduce, apply PR#72: Enable Naive Bayes Tests in h2o Module and run:

 $ mvn test 

from the h2o module:

- NB Aggregator *** FAILED ***
  java.lang.IllegalArgumentException: Not a String
  at water.fvec.Chunk.set_impl(Chunk.java:507)
  at water.fvec.Chunk.set0(Chunk.java:469)
  at water.fvec.Chunk.set(Chunk.java:371)
  at water.fvec.Vec$Writer.set(Vec.java:803)
  at org.apache.mahout.h2obindings.H2OHelper.drmFromMatrix(H2OHelper.java:331)
  at org.apache.mahout.h2obindings.H2OEngine$.drmParallelizeWithRowLabels(H2OEngine.scala:83)                                                                   
  at org.apache.mahout.math.drm.package$.drmParallelizeWithRowLabels(package.scala:67)                                                                          
  at org.apache.mahout.classifier.naivebayes.NBTestBase$$anonfun$2.apply$mcV$sp(NBTestBase.scala:91)                                                            
  at org.apache.mahout.classifier.naivebayes.NBTestBase$$anonfun$2.apply(NBTestBase.scala:70)                                                                   
  at org.apache.mahout.classifier.naivebayes.NBTestBase$$anonfun$2.apply(NBTestBase.scala:70)                                                                   
  ...