MXNet horovod examples result in a seg fault

[apeforest]

Description

Running mnist example under example/distributed_training-horovod caused segmentation fault. Cross linked an issue filed in horovod repo: horovod/horovod#1148

Environment info (Required)

Framework: MxNet

Framework version:
----------MXNet Info-----------
Version : 1.5.0
Directory : /home/ubuntu/anaconda3/envs/mxnet_p36/lib/python3.6/site-packages/mxnet
Commit Hash : 62a85f3

Horovod version: 0.16.4

MPI version: 3.1.0

CUDA version: 10.0

NCCL version:

Python version:
----------Python Info----------
Version : 3.6.5
Compiler : GCC 7.2.0
Build : ('default', 'Apr 29 2018 16:14:56')
Arch : ('64bit', '')

OS and version:
--------System Info----------
Platform : Linux-4.4.0-1081-aws-x86_64-with-debian-stretch-sid
system : Linux
node : ip-172-31-63-186
release : 4.4.0-1081-aws
version : #91-Ubuntu SMP Tue Apr 16 08:21:03 UTC 2019

GCC version: gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609

Error Message:

(Paste the complete error message, including stack trace.)

Minimum reproducible example

horovodrun -np 4 -H localhost:4 python ./resnet.py or mnist.py

[mxnet-label-bot]

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[chandana1332]

Issue is resolved based on horovod/horovod#1148