I have a problem when test the allreduce version.
1) I clone the master code from 
https://github.com/threeleafzerg/incubator-mxnet.
2) I use "make -j $(nproc) USE_OPENCV=1 USE_BLAS=openblas USE_CUDA=1 
USE_CUDA_PATH=/usr/local/cuda USE_CUDNN=1 USE_PROFILER=1 USE_DIST_KVSTORE=1 
USE_ALLREDUCE_DIST_KVSTORE=1 MPI_ROOT=/usr/local/openmpi" to compile. 
3) But when I run the script 
~/incubator-mxnet/tests/nightly/dist_allreduce_sync_kvstore.py, it end with an 
error:

pure virtual method called
terminate called without an active exception
*** Process received signal ***
Signal: Aborted (6)
Signal code:  (-6)

It seems the error occurred in destruct the kvstore, can anyone help me? 
@threeleafzerg 

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https://github.com/apache/incubator-mxnet/pull/10696 ]
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