Conflicting cross-version suffixes in: org.scalanlp:breeze-macros, org.scalanlp:breeze error

[davide...@googlemail.com]

Hi David,
I have a problem when compiling a scala project using SBT.

I started to get the following error since I tried to include the nak library in the project:
[error] Modules were resolved with conflicting cross-version suffixes in {file:/C:/git/cvm/}root:
[error]    org.scalanlp:breeze-macros _2.11, _2.10
[error]    org.scalanlp:breeze _2.11, _2.10
java.lang.RuntimeException: Conflicting cross-version suffixes in: org.scalanlp:breeze-macros, org.scalanlp:breeze
        at scala.sys.package$.error(package.scala:27)
        at sbt.ConflictWarning$.processCrossVersioned(ConflictWarning.scala:47)
        at sbt.ConflictWarning$.apply(ConflictWarning.scala:30)
        at sbt.Classpaths$$anonfun$60.apply(Defaults.scala:1090)
        at sbt.Classpaths$$anonfun$60.apply(Defaults.scala:1090)
        at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
        at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:42)
        at sbt.std.Transform$$anon$4.work(System.scala:64)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
        at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
        at sbt.Execute.work(Execute.scala:244)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
        at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
        at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
[error] (*:update) Conflicting cross-version suffixes in: org.scalanlp:breeze-macros, org.scalanlp:breeze
[error] Total time: 154 s, completed 07-Jan-2016 14:33:31


From reading some posts I understand it should be a conflict between libraries versions.
The following is the excerpt of my build.sbt file:

    libraryDependencies ++= Seq(
     "org.scalanlp" %% "breeze" % "0.12-SNAPSHOT",
     "org.scalanlp" % "nak" % "1.2.1", -- since I added this line it stopped working
     "com.github.danielkorzekwa" %% "bayes-scala-gp" % "0.1-SNAPSHOT",
     "org.scalanlp" %% "breeze-viz" % "0.10",
     "com.typesafe.scala-logging" %% "scala-logging-slf4j" % "2.1.2",
     "tw.edu.ntu.csie" % "libsvm" % "3.17",
     "de.bwaldvogel" % "liblinear" % "1.95",
     //Test dependencies
     "org.slf4j" % "slf4j-log4j12" % "1.7.2" % Test,
     "com.novocode" % "junit-interface" % "0.11" % Test
    ),
   
Can you help me in understanding the issue?   
I am new with scala and object oriented/functional programming, so apologies for the trivial question.

Many thanks,
Davide

[David Hall]

Nak is only published for Scala 2.10 and doesn't work with current breeze at any rate... (Its maintainer flaked and I don't have the desire to keep it going)

Scala doesn't maintain binary compatibility across 2.x versions, which is what the conflicts are about. The difference between 

  "org.scalanlp" %% "breeze" % "0.12-SNAPSHOT",

and

  "org.scalanlp" % "breeze" % "0.12-SNAPSHOT",

(one has a double %%) is that the former appends _${SCALA_VERSION} to the name of the artifact, while the latter doesn't. For reasons I don't understand, nak is published without the scala version tag.

What part of nak did you want?

-- David

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[davide...@googlemail.com]

Hi David,
thanks for your reply and for helping me in understanding better.

What I wanted to use from nak was the libraries to calculate k-means clustering.
Do you have anything to recommend to implement k-means calculations in scala or java?

Many thanks for your help,
Davide

[David Hall]

ah, probably easiest to just copy the source (https://github.com/scalanlp/nak/blob/46462728f0fa85a884387e33f9beeec57f9cd109/src/main/scala/nak/cluster/Kmeans.scala) into your codebase. 

I think it only depends on one other file (https://github.com/scalanlp/nak/blob/46462728f0fa85a884387e33f9beeec57f9cd109/src/main/scala/nak/util/CollectionUtil.scala)

If that doesn't work, I'll whip something together for you.

-- David

To view this discussion on the web visit https://groups.google.com/d/msgid/scala-breeze/94da3571-c288-4db3-969e-664208164ff6%40googlegroups.com.

[davide...@googlemail.com]

Hi David,

thanks so much for your help!!

It seems to be working, I still need to do some QA, but so far so good!

Thanks again!

Davide