yzh119 opened a new issue #18789:
URL: https://github.com/apache/incubator-mxnet/issues/18789
## Description
The Autograd module throws an exception that was not caught:
```
Error in sys.excepthook:
Original exception was:
```
After the execution of the program.
## To Reproduce
Below is a minimal example to reproduce the bug:
```python
from mxnet import nd
import mxnet as mx
x = mx.np.zeros((10,))
x.attach_grad()
class Op(mx.autograd.Function):
def forward(self, x):
out = x + 1
return out
def backward(self, grad):
grad_x = grad
return grad_x
op = Op()
with mx.autograd.record():
y = op(x)
y.sum().backward()
print(x.grad)
```
However, it could successfully print the result
```
[1. 1. 1. 1. 1. 1. 1. 1. 1. 1.]
Error in sys.excepthook:
Original exception was:
```
## Environment
```
----------Python Info----------
Version : 3.7.6
Compiler : GCC 7.3.0
Build : ('default', 'Jan 8 2020 19:59:22')
Arch : ('64bit', '')
------------Pip Info-----------
Version : 20.0.2
Directory : /home/***/anaconda3/lib/python3.7/site-packages/pip
----------MXNet Info-----------
Version : 1.6.0
Directory : /home/***/anaconda3/lib/python3.7/site-packages/mxnet
Num GPUs : 1
Commit Hash : 6eec9da55c5096079355d1f1a5fa58dcf35d6752
----------System Info----------
Platform : Linux-5.7.8-200.fc32.x86_64-x86_64-with-fedora-32-Thirty_Two
system : Linux
node : LAPTOP-24KAE66Q.lan
release : 5.7.8-200.fc32.x86_64
version : #1 SMP Thu Jul 9 14:34:51 UTC 2020
```
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