Created by: qingqing01

https://github.com/PaddlePaddle/Paddle/blob/e4397c4aa84d7d781fd3249b85eefb1d4b85e9b8/paddle/gserver/layers/ROIPoolLayer.cpp#L129-L132

If isEmpty is false, the outputData is not initialized. It should be -FLT_MAX. I'll fix it.