leezu edited a comment on issue #17914: Regression in '+' operator on GPU with CachedOp URL: https://github.com/apache/incubator-mxnet/issues/17914#issuecomment-604559218 I can reproduce this with mxnet-cu101==1.6 on a G4 instancen. This appears to be a bug with operator fusion. If you export `MXNET_USE_FUSION=0` the program works as expect. ``` % MXNET_USE_FUSION=0 python3 test.py 24s ~ ip-172-31-32-170 hybridizing [[0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5] [0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5] [0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5]] % MXNET_USE_FUSION=1 python3 test.py 7s ~ ip-172-31-32-170 hybridizing [[0. 1. 2. 3. 4. 5. 6. 7. 8. ] [9. 0. 1. 2. 3. 4. 5. 6. 7. ] [8. 9. 0. 0.5 1. 1.5 2. 2.5 3. ]] ``` CC @ptrendx
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