mx.symbol.numpy._Symbol.__deepcopy__ logic error

[leezu]

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>

[wkcn]

Agree the expected result, which is consistent with mx.nd:

import mxnet as mx
import copy

v = mx.nd.array([1,2,3]).as_np_ndarray()
b = copy.copy(v)
b[0] = 10
print(b) # [10. 2. 3.]
print(v) # [1. 2. 3.]