Fix unexecutable API examples#17218

Merged

shippingwang merged 2 commits intoPaddlePaddle:developfrom

shippingwang:repair_API

May 6, 2019

Commits on May 5, 2019

fix unexecutable API comments, test=develop
shippingwang
committed

Commits on May 6, 2019

add API.spec,test=develop
shippingwang
committed