roywei commented on issue #18165:
URL:
https://github.com/apache/incubator-mxnet/issues/18165#issuecomment-653226815
I think it still fails for unknow shape case. The above code works fine for
0 dim, but use -1 to represent unknown shape still fails:
```
>>> with mx.np_shape(active=True):
... a = mx.sym.Variable("a")
... b = mx.sym.Flatten(a)
... exec = b.simple_bind(ctx=mx.cpu(), a=(-1,10,2))
... exec.forward(a=mx.nd.ones((32,10,2)))
...
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
File "//anaconda3/lib/python3.7/site-packages/mxnet/symbol/symbol.py",
line 1754, in simple_bind
array('I', provided_arg_shape_data)),
OverflowError: can't convert negative value to unsigned int
```
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