leezu opened a new issue #18685:
URL: https://github.com/apache/incubator-mxnet/issues/18685
`mx.symbol.numpy._Symbol.__deepcopy__` performs shallow copy instead of deep
copy like `mx.symbol.Symbol.__deepcopy__ `.
Problem:
```
[ins] In [1]: import mxnet as mx
[ins] In [2]: import copy
[ins] In [3]: v = mx.sym.Variable('a').as_np_ndarray()
[ins] In [4]: b = copy.copy(v)
[ins] In [5]: b._set_attr(name='b')
[ins] In [6]: v
Out[6]: <_Symbol b>
[ins] In [7]: b
Out[7]: <_Symbol b>
```
Expected:
```
[ins] In [1]: import mxnet as mx
[ins] In [2]: import copy
[ins] In [3]: v = mx.sym.Variable('a').as_np_ndarray()
[ins] In [4]: b = copy.copy(v)
[ins] In [5]: b._set_attr(name='b')
[ins] In [6]: v
Out[6]: <_Symbol a>
[ins] In [7]: b
Out[7]: <_Symbol b>
```
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