jesterhazy opened a new issue #12416: opencv path error in mxnet scala tutorial URL: https://github.com/apache/incubator-mxnet/issues/12416 Note: Providing complete information in the most concise form is the best way to get help. This issue template serves as the checklist for essential information to most of the technical issues and bug reports. For non-technical issues and feature requests, feel free to present the information in what you believe is the best form. For Q & A and discussion, please start a discussion thread at https://discuss.mxnet.io ## Description The mxnet scala in intellij instructions at http://mxnet.incubator.apache.org/tutorials/scala/mxnet_scala_on_intellij.html do not work because of an opencv library path error. ``` Package used (Python/R/Scala/Julia): mxnet-scala For Scala user, please provide: 1. Java version: 1.8.0_171 2. Maven version: 3.3.9 3. Scala runtime if applicable: 2.11.8 For R user, please provide R `sessionInfo()`: ``` ## Error Message: ``` Exception in thread "main" java.lang.UnsatisfiedLinkError: /private/var/folders/nz/57cdgtr11pdg01rgzyzhjxvmqwmxjn/T/mxnet4117240061172168094/mxnet-scala: dlopen(/private/var/folders/nz/57cdgtr11pdg01rgzyzhjxvmqwmxjn/T/mxnet4117240061172168094/mxnet-scala, 1): Library not loaded: /usr/local/opt/opencv/lib/libopencv_stitching.3.4.dylib Referenced from: /private/var/folders/nz/57cdgtr11pdg01rgzyzhjxvmqwmxjn/T/mxnet4117240061172168094/mxnet-scala Reason: image not found at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824) at java.lang.Runtime.load0(Runtime.java:809) at java.lang.System.load(System.java:1086) at org.apache.mxnet.util.NativeLibraryLoader$.loadLibraryFromStream(NativeLibraryLoader.scala:140) at org.apache.mxnet.util.NativeLibraryLoader$.loadLibrary(NativeLibraryLoader.scala:93) at org.apache.mxnet.Base$.<init>(Base.scala:70) at org.apache.mxnet.Base$.<clinit>(Base.scala) at org.apache.mxnet.NDArray$.initNDArrayModule(NDArray.scala:151) at org.apache.mxnet.NDArray$.<init>(NDArray.scala:38) at org.apache.mxnet.NDArray$.<clinit>(NDArray.scala) at mxnet.App$.delayedEndpoint$mxnet$App$1(App.scala:9) at mxnet.App$delayedInit$body.apply(App.scala:6) at scala.Function0$class.apply$mcV$sp(Function0.scala:34) at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12) at scala.App$$anonfun$main$1.apply(App.scala:76) at scala.App$$anonfun$main$1.apply(App.scala:76) at scala.collection.immutable.List.foreach(List.scala:381) at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35) at scala.App$class.main(App.scala:76) at mxnet.App$.main(App.scala:6) at mxnet.App.main(App.scala) ``` ## Steps to reproduce 1. Follow tutorial to "Step 7. Run Sample MXNet Code in the App" and run the app 2. App fails with stack trace shown above. ## What have you tried to solve it? 1. Replacing the `brew install opencv@2` command in the mac prequisite setup section with `brew install opencv` fixes the problem and lets the example app run successfully. So either the example doc needs to be revised to use the other opencv version, or mxnet scala needs to look for different lib path.
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