[GitHub] TobiasSkovgaardJepsen commented on issue #10220: Check failed: !ndinputs.back()->is_none()

[GitBox <gi...@apache.org>]

TobiasSkovgaardJepsen commented on issue #10220: Check failed: !ndinputs.back()->is_none()
URL: https://github.com/apache/incubator-mxnet/issues/10220#issuecomment-454733804
 
 
   I appear to have encountered this error as well. In my case the error initially failed silently because I am adding two losses, but it turns out only one of them is used during backpropagation. Using just the other loss I get:
   ```
   MXNetError: [11:35:53] src/imperative/imperative_utils.cc:58: Check failed: !ndinputs.back()->is_none() node_588342 0
   
   Stack trace returned 7 entries:
   [bt] (0) 0   libmxnet.so                         0x0000000123133b90 libmxnet.so + 15248
   [bt] (1) 1   libmxnet.so                         0x000000012313393f libmxnet.so + 14655
   [bt] (2) 2   libmxnet.so                         0x000000012468ee74 MXNDListFree + 587044
   [bt] (3) 3   libmxnet.so                         0x00000001246848e3 MXNDListFree + 544659
   [bt] (4) 4   libmxnet.so                         0x00000001245d8f2e MXAutogradBackwardEx + 1022
   [bt] (5) 5   _ctypes.cpython-36m-darwin.so       0x000000010fdbf427 ffi_call_unix64 + 79
   [bt] (6) 6   ???                                 0x00007ffee1aeb630 0x0 + 140732684744240
   ```

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services