Changes in approximate convolution

[ayeshamkzhh]

Hi, I was wondering if approx_nn_conv_ops_ref.cpp needs to be edited and then, the libApproxGPUOpsTF.so need to be created again if we want to make any changes in the convolution. It seems like in line 300 of this file, prodValueQ is meant for storing the approximate multiplication result in convolution.

I tried to make some changes in convolution there and run the cmake and make commands again but its quite strange that no changes affect the accuracy.