I download the mxnet source code, but didn't compile since i used the mxnet 
installed by pip. when i use the launch.py provided in the mxnet source code, 
some errors shows up:

xiaomin.wu@iva0605:/autofs/data56/public/xiaomin.wu/code/dist_mxnet_test$ 
python 
/autofs/data56/public/xiaomin.wu/software/incubator-mxnet-1.2.0/tools/launch.py 
-n 2 -s 2 -H hosts --sync-dst-dir /home/xiaomin.wu/cifar10_dist --launcher ssh 
"python /autofs/data56/public/xiaomin.wu/code/dist_mxnet_test/cifar10_dist.py"
Can't load dmlc_tracker package.  Perhaps you need to run
    git submodule update --init --recursive
Traceback (most recent call last):
  File 
"/autofs/data56/public/xiaomin.wu/software/incubator-mxnet-1.2.0/tools/launch.py",
 line 128, in <module>
    main()
  File 
"/autofs/data56/public/xiaomin.wu/software/incubator-mxnet-1.2.0/tools/launch.py",
 line 96, in main
    args = dmlc_opts(args)
  File 
"/autofs/data56/public/xiaomin.wu/software/incubator-mxnet-1.2.0/tools/launch.py",
 line 48, in dmlc_opts
    from dmlc_tracker import opts
ImportError: No module named dmlc_tracker

[ Full content available at: 
https://github.com/apache/incubator-mxnet/issues/12363 ]
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