zhanghang1989 commented on issue #12216: syncBN can't work URL: https://github.com/apache/incubator-mxnet/issues/12216#issuecomment-413936008 1). Please set `num_devices` to the number of gpus, if not all of them are used. 2). Please make sure each gpu has at least one training sample. 3). I only use gluon API, someone also get Symbol working, but I haven't tried. You can refer to GluonCV for examples https://github.com/dmlc/gluon-cv/blob/master/scripts/segmentation/train.py#L112
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