The `*.whl`, which is generated by compiling the current developing branch, doesn't contain `version.py`.
Created by: chengduoZH
The *.whl, which is generated by compiling the current developing branch, doesn't contain version.py, this will cause an exception when calling import paddle.
In [1]: import paddle
Warning with import paddle: you should not
import paddle from the source directory; please install paddlepaddle*.whl firstly.
In [2]: