[GitHub] leezu opened a new issue #11551: NDArray __getitem__ reads invalid memory with advanced indexing and negative indices

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

leezu opened a new issue #11551: NDArray __getitem__  reads invalid memory with advanced indexing and negative indices 
URL: https://github.com/apache/incubator-mxnet/issues/11551
 
 
   ## Description
   Consider
   
   ```python
   import mxnet as mx
   a = mx.nd.ones((10, 10))
   print(a[(mx.nd.arange(3), mx.nd.arange(3))])
   print(a[(mx.nd.arange(-1, 3), mx.nd.arange(-1, 3))])
   ```
   The second statement results in non-deterministic and wrong results:
   
   ```
   % python mxnet_test.py                                                                                                                                                                                   
   
   [1. 1. 1.]
   <NDArray 3 @cpu(0)>
   
   [0. 1. 1. 1.]
   <NDArray 4 @cpu(0)>
   % python mxnet_test.py                                                                                                                                                                                    
   
   [1. 1. 1.]
   <NDArray 3 @cpu(0)>
   
   [4.0069412e+24 1.0000000e+00 1.0000000e+00 1.0000000e+00]
   <NDArray 4 @cpu(0)>
   % python mxnet_test.py                                                                                                                                                                                    
   
   [1. 1. 1.]
   <NDArray 3 @cpu(0)>
   
   [6.652955e-33 1.000000e+00 1.000000e+00 1.000000e+00]
   <NDArray 4 @cpu(0)>
   %  
   ```
   
   ## Environment info (Required)
   At least on mxnet 1.2 and master

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