How to use sass_func for computing convolution?

[peyer]

Thanks for your great work!
I just wanna to compare the latency of running convolution layer between anakin_sass and cudnn, and I have successfully ran convolution layer with cudnn.
However, when I call api of direct_conv_bias_Kdivis4 in sass_funcs.h, I found that I just did not understand the meaning of parameters like img_in_channel_stride, img_in_height_stride and so on.
So, How should I set the img_in_channel_stride parameter properly?

[throneclay]

please take https://github.com/PaddlePaddle/Anakin/blob/master/saber/funcs/impl/cuda/saber_conv_direct.cpp as an example