samskalicky opened a new issue #20422:
URL: https://github.com/apache/incubator-mxnet/issues/20422
## Description
it looks like there is a change in how slicing works since 1.4.1 (where it
worked correctly) to newer versions (errors out in 1.5, but succeeds and
returns weird results in 1.6)
in 1.4.1 slicing returns:
```
[[0. 0. 0. 0. 0. 0. 0. 0. 1. 0.]
[0. 0. 0. 1. 0. 0. 0. 0. 0. 0.]
[1. 0. 0. 0. 0. 0. 0. 1. 0. 0.]
[0. 0. 0. 0. 0. 0. 0. 0. 1. 0.]
[0. 1. 0. 0. 0. 0. 0. 0. 0. 0.]
[0. 0. 1. 0. 0. 0. 0. 0. 0. 0.]
[0. 0. 0. 0. 0. 0. 1. 0. 0. 0.]
[1. 0. 1. 0. 0. 0. 0. 0. 0. 0.]
[0. 0. 0. 0. 0. 0. 0. 0. 0. 1.]
[0. 0. 0. 0. 0. 1. 0. 0. 0. 0.]]
<NDArray 10x10 @cpu(0)>
<CSRNDArray 10x10 @cpu(0)>
```
and in 1.5.0 & 1.5.1 it throws this error:
```
Traceback (most recent call last):
File "test.py", line 30, in <module>
a = arr.slice(begin=(0,0), end=(10,0))
File "/home/ubuntu/mxnet2/python/mxnet/ndarray/ndarray.py", line 1148, in
slice
return op.slice(self, *args, **kwargs)
File "<string>", line 86, in slice
File "/home/ubuntu/mxnet2/python/mxnet/_ctypes/ndarray.py", line 92, in
_imperative_invoke
ctypes.byref(out_stypes)))
File "/home/ubuntu/mxnet2/python/mxnet/base.py", line 253, in check_call
raise MXNetError(py_str(_LIB.MXGetLastError()))
mxnet.base.MXNetError: [19:46:49] src/operator/tensor/./matrix_op-inl.h:701:
Check failed: b != e (0 vs. 0) : slicing with begin[1]=end[1]=0 results in an
empty tensor and is not supported
```
but in 1.6.0 slicing returns:
```
[]
<NDArray 10x0 @cpu(0)>
<CSRNDArray 10x0 @cpu(0)>
```
## To Reproduce
```
import mxnet as mx
data = [[0, 0, 0, 0, 0, 0, 0, 0, 1, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 0, 0],
[1, 0, 0, 0, 0, 0, 0, 1, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 1, 0],
[0, 1, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 1, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 1, 0, 0, 0],
[1, 0, 1, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[0, 0, 0, 0, 0, 1, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 0, 1],
[0, 0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 1, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 1, 0, 1],
[0, 0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 1, 0, 0],
[0, 0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 0, 0]]
arr = mx.nd.array(data)
print(arr)
csr = arr.tostype('csr')
print(csr)
a = arr.slice(begin=(0,0), end=(10,0))
b = csr.slice(begin=(0,0), end=(10,0))
print(a)
print(b)
```
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