wuxun-zhang commented on issue #14286: Add examples of running MXNet with Horovod URL: https://github.com/apache/incubator-mxnet/pull/14286#issuecomment-473154775 I built MXNet from this [commit](https://github.com/apache/incubator-mxnet/commit/9a3e4a02ded9c6d2c304557140dac0c9991d507e) by using GCC 5.3.1-6. When I built Horovod from source using `pip install --no-cache-dir -v [horovod_repo_dir]`, there are no issues. However, when I install Horovod by `pip install horovod` directly, I got an error like `OSError: /home/wuxunzha/anaconda3/envs/conda3_official_horovod_fp32_training/lib/python3.6/site-packages/horovod/mxnet/mpi_lib.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZTINSt6thread6_StateE`. I saw there are some existing issues like [656](https://github.com/horovod/horovod/issues/656). I also checked the `LD_LIBRARY_PATH`, but still have the same error.
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