Commits on Oct 19, 2018

1. NativeResource Management in Scala (apache#12647) …

   * add Generic MXNetHandle trait and MXNetHandlePhantomRef class that will be used by all MXNetObjects
   
   * Generic Handle with AutoCloseable
   
   * add NativeResource and NativeResourceManager with Periodic GC calling
   
   * use NativeResource trait in NDArray, Symbol and Executor
   
   * add run train mnist script
   
   * create a Generic ResourceScope that can collect all NativeResources to dispose at the end
   
   * modify NativeResource and ResourceScope, extend NativeResource in NDArray, Symbol and Executor
   
   * remove GCExecutor
   
   * deRegister PhantomReferences by when calling dispose()
   
   * add Finalizer(temporary) to NativeResource
   
   * refactor NativeResource.dispose() method
   
   * update NativeResource/add Unit Test for NativeResource
   
   * updates to NativeResource/NativeResourceRef and unit tests to NativeResource
   
   * remove redundant code added because of the object equality that was needed
   
   * add ResourceScope
   
   * Fix NativeResource to not remove from Scope, add Unit Tests to ResourceScope
   
   * cleanup log/print debug statements
   
   * use TreeSet inplace of ArrayBuffer to speedup removal of resources from ResourceScope
   Fix Executor dispose and make KVStore a NativeResource
   
   * fix segfault that was happening because of NDArray creation on the fly in Optimizer
   
   * Add comments for dispose(param:Boolean)

   

   nswamy authored and Ayres committed Oct 19, 2018
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