GPU memory cannot be released after MXPredFree

[rrjia]

Hi,

I use the C++ APIs of MXNet to do some classification tasks. But I find that MXNet does not release GPU memory when calling MXPredFree(). When my program exits, all occupied GPU memory is released. So when I run my program, I can do classification just once, otherwise GPU memory is not enough. I think this is a very serious problem. I hope MXNet developers @tqchen @mli @piiswrong can look into this issue and resolve it ASAP. Thanks!

The sequence of function calls is as follows:
(1) MXPredCreate
(2) MXPredSetInput
(3) MXPredForward
(4) MXPredGetOutput
(5) MXPredFree

after i call MXPredCreate the GPU memory will capture by mxnet, by i can not release gpu memory bu mxnet c_predict_api