!14 【轻量级 PR】：update tutorials/source_zh_cn/use/debugging_in_pynative_mode.md....

!14 【轻量级 PR】：update tutorials/source_zh_cn/use/debugging_in_pynative_mode.md. Remove duplicate import numpy
Merge pull request !14 from cathwong/N/A

tutorials/source_zh_cn/use/debugging_in_pynative_mode.md

@@ -107,7 +107,6 @@ print(output.asnumpy())
 
 ```python
 import numpy as np
-import numpy as np
 import mindspore.nn as nn
 from mindspore import context, Tensor
 import mindspore.ops.operations as P