Created by: zhiqiu

PR types

Bug fixes

PR changes

Others

Describe

Specify numpy>=1.13

Paddle use the feature __array_ufunc__ of numpy, which is released in version in 1.13, see details in doc of __array_ufunc__.

https://github.com/PaddlePaddle/Paddle/blob/049ac56c081381c524b3f8cbabb8e2504ca45c49/python/paddle/fluid/dygraph/math_op_patch.py#L251-L259

So this PR is going to specify numpy>=1.13 in requirements.