[GitHub] leezu opened a new issue #11552: broadcast_reduce_op does check for negative axes

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

leezu opened a new issue #11552: broadcast_reduce_op does check for negative axes
URL: https://github.com/apache/incubator-mxnet/issues/11552
 
 
   
   ## Description
   Consider
   ```python
   import mxnet as mx
   a = mx.nd.ones((1, 1, 1, 1, 1, 1, 1))
   print(mx.nd.broadcast_axes(a, -4, 10).shape)
   ```
   
   Results in
   
   ```
   Traceback (most recent call last):
     File "mxnet_test.py", line 3, in <module>
       print(mx.nd.broadcast_axes(a, -4, 10).shape)
     File "<string>", line 56, in broadcast_axes
     File "/Users/lllausen/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/_ctypes/ndarray.py", line 92, in _imperative_invoke
       ctypes.byref(out_stypes)))
     File "/Users/lllausen/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/base.py", line 210, in check_call
       raise MXNetError(py_str(_LIB.MXGetLastError()))
   mxnet.base.MXNetError: [00:40:51] src/operator/tensor/./broadcast_reduce_op.h:306: Check failed: oshape[param.axis[i]] == 1U (2332991486559351923 vs. 1) Broadcasting axis must have size 1
   
   Stack trace returned 8 entries:
   [bt] (0) 0   libmxnet.so                         0x000000011000c3b4 libmxnet.so + 21428
   [bt] (1) 1   libmxnet.so                         0x000000011000c16f libmxnet.so + 20847
   [bt] (2) 2   libmxnet.so                         0x0000000110359431 libmxnet.so + 3482673
   [bt] (3) 3   libmxnet.so                         0x000000011113d47a MXNDListFree + 497978
   [bt] (4) 4   libmxnet.so                         0x000000011113c099 MXNDListFree + 492889
   [bt] (5) 5   libmxnet.so                         0x000000011109d40a MXCustomFunctionRecord + 20666
   [bt] (6) 6   libmxnet.so                         0x000000011109e4b0 MXImperativeInvokeEx + 176
   [bt] (7) 7   libffi.6.dylib                      0x000000010f0f7884 ffi_call_unix64 + 76
   ```
   
   The expected behavior is to either check and report that negative axes are invalid or to wrap around.

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