apeforest opened a new issue #17715: MXNet nightly cpu build (w/o MKLDNN) does not work with Horovod URL: https://github.com/apache/incubator-mxnet/issues/17715 ## Description Installing Horovod with MXNet nightly CPU (w/o MKLDNN) failed. GPU build and CPU mkldnn build are both okay. ## Error Message: OSError: /usr/local/lib/python3.6/dist-packages/horovod/mxnet/mpi_lib.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN5mxnet10CopyFromToERKNS_7NDArrayEPS1_i @TaoLv Is it also related to the change you made recently that fixed MKLDNN build?
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