[GitHub] [incubator-mxnet] reminisce opened a new issue #17389: Indexing ndarray should give empty array output

[GitBox]

reminisce opened a new issue #17389: Indexing ndarray should give empty array 
output
URL: https://github.com/apache/incubator-mxnet/issues/17389
 
 
   ## Description
   When indexing an ndarray with an index greater than the dim size, it should 
produce an empty ndarray as in NumPy, instead of throwing an error.
   
   ```python
   >>> import mxnet as mx
   >>> mx.npx.set_np()
   >>> a = mx.np.arange(1)
   >>> a
   array([0.])
   >>> a[1:]  # index exceeds dim size, should result in an empty array instead 
of throwing an error
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File "/home/ubuntu/unison/mxnet4/cpu/python/mxnet/numpy/multiarray.py", 
line 663, in __getitem__
       return self._slice(key.start, key.stop)
     File "/home/ubuntu/unison/mxnet4/cpu/python/mxnet/ndarray/ndarray.py", 
line 1343, in _slice
       start, stop, _ = _get_index_range(start, stop, self.shape[0])
     File "/home/ubuntu/unison/mxnet4/cpu/python/mxnet/ndarray/ndarray.py", 
line 3100, in _get_index_range
       raise IndexError('Slicing start %d exceeds limit of %d' % (start, 
length))
   IndexError: Slicing start 1 exceeds limit of 1
   >>> a.asnumpy()[1:]  # Okay in NumPy
   array([], dtype=float32)
   >>> a
   array([0.])
   >>> 
   ```
   @Alicia1529 
   

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