wkcn commented on issue #16365: customOp Exception: unknown storage type: -1 URL: https://github.com/apache/incubator-mxnet/issues/16365#issuecomment-548356804 I met the same problem in Deformable ConvNets when I changed `ENABLE_OHEM: false` :( https://github.com/msracver/Deformable-ConvNets/blob/master/experiments/fpn/cfgs/resnet_v1_101_coco_trainval_fpn_dcn_end2end_ohem.yaml#L82 I tried to address the problem, and I found some NDArray is not initalized. https://github.com/apache/incubator-mxnet/blob/master/src/c_api/c_api.cc#L588
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