[GitHub] [incubator-mxnet] DNXie opened a new issue #20180: mxnet.ndarray.contrib.box_encode crashes(segfault) when `refs` is of length 0

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

DNXie opened a new issue #20180:
URL: https://github.com/apache/incubator-mxnet/issues/20180


   ## Description
   `mxnet.ndarray.contrib.box_encode` crashes(segfault) when `refs` is of length 0
   
   ### Error Message
   
   ~~~python
   
   Fatal Error: Segmentation fault
   Stack trace:
   Segmentation fault (core dumped)
   ~~~
   
   
   ## To Reproduce
   The reproducing code can also be find in the [gist](https://colab.research.google.com/drive/1igrG40TSPVYvXn8Im8gOAzSar9ak-13P?usp=sharing)
   ~~~python
   import mxnet
   import numpy as np
   samples=mxnet.nd.ones((1,1))
   matches=mxnet.nd.ones((1,1))
   anchors=mxnet.nd.ones((1,1,4))
   refs=mxnet.nd.array(np.ones((1,0,4)))
   means=mxnet.nd.ones((4,))
   stds=mxnet.nd.ones((4,))
   mxnet.ndarray.contrib.box_encode(samples=samples, matches=matches, anchors=anchors, refs=refs, means=means, stds=stds)
   ~~~
   
   
   ## Environment
   
   OS: ubuntu 18.04
   Python: 3.7.6
   pip: 20.0.2
   numpy: 1.18.5
   mxnet: 1.7.0
   


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