* Backward data convolution: https://github.com/asroy/modular_convolution/blob/aafb5eb18781f1ac9e06a17c3e53d968dd53dcc0/driver/conv_bwd_data_driver_v2.cpp#L22
* verify: 0 = no verification; 1 = do verification
* verify: 0 = no verification; 1 = do verification